Abbott Architect Ci8200 Research Articles

A Study Estimating the Serum TSH Levels in First Trimester Pregnant Women

Background Pregnancy is a physiological condition among women. Pregnancy brings about major changes in the hormonal levels. Thyroid stimulating hormone is a hormone produced by anterior pituitary. TSH provides the most common sensitive index to reliably detect thyroid function abnormalities.ObjectiveThe goal of this study was to estimate the levels of serum TSH at first trimester in pregnant women in the department of Biochemistry St. Johnrsquos Medical College amp Hospital and compare with the biological reference intervals as established in the laboratory. Methodology This retrospective study was conducted from January to December 2021 in the department of Biochemistry St. Johnrsquos Medical College amp Hospital. Lab data review of pregnant women has been analysed for serum TSH. The study included 228 pregnant women in their first trimester aged between 20 and 35 years. Serum TSH levels were measured using the ABBOTT ARCHITECT CI8200 through Chemiluminometric Immunoassay. The collected data underwent analysis and comparison to derive descriptive statistics.Result A total of 228 pregnant women in the first trimester fulfilling the inclusion criteria were included. Maternal age of the study population was 20-35 years. Among the pregnant women 12 5.3 women showed low values for TSH lt0.35 microIUMl 11 4.8 women showed higher values for TSH gt4.94 microIUmL and 205 89.9 showed normal TSH levels during first trimester. In this study the mean TSH level in pregnant women was found to be 1.94plusmn1.50 microIUmL. The median TSH levels was 1.51 microIUmL 2.5th and 97.5th percentiles P2.5-P97.5 0.23-5.86 microIUmL.Conclusion The observed connection between aberrant TSH serum levels during the first trimester and adverse pregnancy outcomes underscores the necessity for proactive screening. Identifying pregnant women with elevated or reduced TSH levels early on holds significant potential for preventing complications. The incorporation of such screening protocols can yield a range of benefits including timely interventions and enhanced management strategies to mitigate adverse outcomes. Our research contributes to the growing body of evidence supporting TSH screening during early pregnancy emphasizing its pivotal role in safeguarding maternal and foetal health.

Verification of analytical performance of sodium assay on the Abbott architect ci8200: Experience of the central laboratory Mohammed VI Oujda

Introduction: Sodium is the main extracellular cation. It plays a fundamental role in maintaining osmotic pressure and hydroelectrolyte balance, and is therefore implicated in many pathological conditions. Sodium determination is a basic biochemistry laboratory test. Objective: the aim of our work is to verify the method of sodium determination by potentiometry on the Architect CI 8200 automated system (Abbott), in order to meet the quality requirements for laboratory accreditation under standard NF ISO 15189. Materials and methods: following the recommendations of NF EN ISO 15189, we evaluated the repeatability, intermediate precision, accuracy and uncertainty of measurement of the serum sodium assay on the Architect CI 8100 automated system, as well as a mirror comparison of the two Architect CI 8100 1 and 2. The CV values obtained were compared with those set by learned societies (SFBC and RICOS). Results and discussion: The results obtained show satisfactory repeatability for the 3 low, medium and high levels, with CV1= 1.1%, CV2=0.8% and CV3= 0.76% respectively, and satisfactory intra-laboratory reproducibility for the 3 low, medium and high levels, with CV1= 1.05%, CV2= 0.95% and CV3= 0.75% respectively. For comparison, the Bland-Altman diagram showed that the mean bias between the two automata was of the order of 0.29%, the correlation coefficient r= 0.98 with a mean difference of 0.40 mmol/l, a standard deviation of 0.675 mmol/l and a linear regression equation Y = 1.027 X - 4.073. Corrective measures were envisaged to remedy the various errors identified. To solve any malfunction in a sustainable way, it is essential to search for the anomaly by applying the Ishikawa diagram. Conclusion: The results obtained have enabled us to verify the performance of the sodium assay method and compare it with the analytical objectives set, in order to meet the regulatory and normative requirements to which our laboratory is committed.

Verification of the analytical performance of the serum total cholesterol assay on Abbott Architect ci8200

Serum total cholesterol measurement is an essential aspect of preventive healthcare as high levels of cholesterol are linked to various diseases such as atherosclerosis, heart attacks, and strokes. Serum cholesterol measurement is a simple blood test that assesses the levels of cholesterol in the bloodstream. It is an important diagnostic tool that helps healthcare professionals evaluate a patient's risk of developing cardiovascular disease and make decisions regarding treatment and lifestyle changes. Our study aims to verify the analytical performance of the serum total cholesterol assay method using an Abbott kit on the Architect ci8200 automated system in the biochemistry laboratory of the Mohammed VI University Hospital of Oujda. The analytical performance of the kit was verified through flexible scope A by performing a performance study on the Architect ci8200. We evaluated the repeatability, the reproducibility, the imprecision of the measurements and the comparison between two Architect ci8200 automatons. All the results obtained are in conformity with the acceptability criteria recommended by the supplier and the Valtec protocol of the ‘Société Française de Biologie Clinique’ (SFBC), and the study is globally satisfactory. The analytical performance of the Architect ci8200 automated system was satisfactory for a reliable determination of total cholesterol. Verification of methods of dosage in the medical laboratory is crucial to ensure the accuracy, precision, and reliability of laboratory test results. Verification involves confirming that the test method employed is appropriate for the intended use, produces results that are consistent with the claimed performance characteristics, and meets the laboratory's quality control and quality assurance requirements.

Association of vitamin-D with hypothyroidism in adult female patients in north Indian population

Background: Thyroid disorder is found to be most commonly occurring endocrine disorder in females. Thyroid hormones have an imperative position in metabolic methods in human body, and several physiological and pathological stimuli are known to influence thyroid metabolism. The increased incidence of hypovitaminosis D was diagnosed in population with hypothyroidism. Objective: To check the relation of Vitamin D in adult female patients diagnosed with hypothyroidism. Method: We recruited 60 patients and divided these patients into two groups, Group-1- Hypothyroidism patients (n=30) and Group-2- Control patients (n=30). Thyroid-Stimulating Hormone (TSH), total Triiodothyronine (T3), total Thyroxine (T4), and Vitamin D levels were estimated by automated method in Abbott ARCHITECT ci8200 machine. Results: In the present study we found patients with hypothyroidism 73.3% (n=22) has low level of Vitamin D while 26.6% (n=8) of population have normal level of Vitamin D. We could not find significant association between Vitamin D and hypothyroidism (p>0.05). Conclusion: Our study concluded that hypothyroidism has no significant role in lowering the levels of Vitamin D but we also emphasize the fact that Vitamin D should be done as routine investigation in healthy as well as hypothyroidism patients as its value was also less in control subjects.

Measurement of Urinary Ammonium Using a Commercially Available Plasma Ammonium Assay.

Determination of urinary ammonium excretion is helpful in evaluating patients with acid-base disorders, chronic kidney disease, and nephrolithiasis. However, urinary ammonium levels are only measured by specialized laboratories in the United States, limiting widespread implementation. We evaluated the performance of a plasma ammonium assay to quantify urinary ammonium excretion and also determined ammonium stability under a variety of conditions. An enzymatic plasma ammonium assay (Randox) was modified to measure urinary ammonium concentration. Urine samples were diluted 40-fold and then assayed on an Abbott Architect ci8200 analyzer. Assay precision, limit of quantitation, and linearity were determined. The method was compared against the formalin titration method, and stability studies were conducted at different temperatures and pH. After dilution, the assay had total precision of 18% at 2.54 mmol/L, 5% at 15.58 mmol/L, and 2% at 29.49 mmol/L, with a limit of quantitation of 2.92 mmol/L. Assay performance was linear in the range of 0.7-45 mmol/L. Method comparison against the formalin method showed a slope of 0.98 and intercept of -0.37 mmol/L. Urinary ammonium was determined to be stable for 48 hours at room temperature and for 9 days at 4°C and -20°C at pH 5.6-6.3. Ammonium was less stable at pH 3.8 and 8.5. When stored at -80°C, urinary ammonium was stable for at least 24 months. The modified enzymatic plasma ammonium assay reliably quantifies urine ammonium at physiologic concentrations. It compares well with the formalin titration method and is suitable for routine clinical use on an automated chemistry analyzer.

Thyroid stimulating hormone values of clinical decisions of hypothyroidism measurement by three different automated immunoassays

Background: An accurate measurement of serum thyroid stimulating hormone (TSH) is crucial for a thyroid disorder diagnosis and management. We compared the values of TSH between three automated immunoassays with aims to provide insights into variations in TSH levels that are important for a clinical decision: 2.50 mIU/L, 4.00 mIU/L and 10.00 mIU/L.Methods: We measured TSH with three different fully automated immunoassays: Abbott (Architect ci8200), Siemens (ADVIA Centaur XP) and Roche (Cobas e411). Serum was collected from 110 patients between August 2018 and January 2019. The results were compared using the Passing–Bablok regression method. Additionally, linear regression coefficients were calculated after logarithmic transformation of data.Results: Although all three regression coefficients were high (r2 > 0.98), the slopes from Passing–Bablok plots for the correlation of Abbott with either Roche or Siemens were merely 0.66 and 0.73, respectively. The slope for the correlation of Roche and Siemens was 1.11. Consecutively, the results obtained by the Roche and Siemens methods were proportionally higher than those obtained by the Abbott method (38% and 52%, respectively) at all measured ranges.Conclusions: Although immunoassays correlated among themselves, they cannot achieve the same values for clinical decisions for hypothyroidism (clinical requirements). Clinicians should be conscious of these limitations. A harmonisation of the methods is needed to meet clinical requirements and to enable appropriate clinical decisions in cases of hypothyroidism.Likewise, we suggest the introduction of borderline and high risk values of TSH for hypothyroidism depending on immunoassays to avoid misdiagnosis.

Comparison between Roche Integra 400 plus and Abbott Architect ci8200 in Alanine aminotransferase assay

BackgroundThe aim of this work is to present the results of a comparative study between the ALT assay on Integra 400 plus Roche Diagnostic versus Architect ci8200 of Abbott Diagnostic. MethodsA total of 200 patients hospitalized in the various departments of the university hospital Mohammed VI of Oujda were prospectively tested on two systems: Abbott Architect ci8200 and Roche Integra 400 plus. Both analyzers use the spectrophotometric technique by coupling the transamination reaction to the oxidation-reduction reaction at NAD. The agreement of the results between the different techniques was evaluated using the Bland-Altman difference diagram and the Passing-Bablok and Deming regression line. ResultsThere was a high concordance between the two assays: the equation of the Passing-Bablok line is YArchitect ​= ​−0,5625 ​+ ​0,9917 XIntegra with a correlation coefficient r2 = 0.999. The Bland-Altman diagram shows that the mean bias between the two methods is of the order of 1.1 IU/L and the difference between the ALT measurements by Architect and Integra is in the range of −1.4 to 3.6. ConclusionOur study shows a high correlation of the ALT assay results between the architect ci8200 and Integra 400 plus.

HbA1c enzymatic assay evaluation at an academic laboratory

Background: HbA1c is a well-known and widely accepted marker for monitoring glycaemic control in patients with Diabetes Mellitus. It has also been shown to predict long term microvascular complications associated with Diabetes Mellitus. As a result the International Expert Committee has endorsed HbA1c as a diagnostic marker for Diabetes Mellitus. There are several assays available for the measurement of HbA1c and the recommended assay performance is an intralaboratory coefficient of variation of <2%. The aim of the study was to evaluate the analytical performance of the HbA1c enzymatic assay on the Abbott Architect ci8200. Method: The precision, reportable range and bias were determined by following The Clinical and Laboratory Standards Institute (CLSI) EP05, EP06 and EP15 guidelines. Bias was determined by comparison between the Abbott Architect and the Biorad Variant II analyser. Results: The total impresicion for low and high controls was 1.06% and 1.8% respectively. The assay demonstrated excellent correlation with the Biorad Variant II analyser with a slope of 0.923, intercept of 0.569 and R2 of 0.978. The Bland-Altman mean difference was 0.044 between the Abbott Architect and Biorad Variant II analysers. At the diagnostic and monitoring cut-off, the bias was found to be 1.05% and 0.43% respectively. Conclusion: The new enzymatic HbA1c assay demonstrated good precision and had the advantage of rapid analysis thus prompt results reporting. The study also demonstrated acceptable agreement of the Abbott Architect and Bio-Rad Variant II methods across the measured range. Notably, the assay met analytical goals for the diagnosis and monitoring of Diabetes Mellitus using, as the total allowable error was 1.13% and 1.03% respectively, which was well below the 3% total allowable recommended error from biological data.

Lipemic interference of ceruloplasmin assays – An evaluation of lipid removal methods

BackgroundThe present studies were conducted to characterize lipemic interference across three FDA-cleared ceruloplasmin (CERU) assays and to evaluate procedures designed to remove lipemic interference. MethodsCERU assays on the Abbott ARCHITECT ci8200, Beckman AU5800, and Roche cobas Integra 400 Plus were evaluated. Precision, linearity with dilution, lipemic interference, and three methods for removing lipemia were assessed on each platform: ultracentrifugation (UC), lipemia-clearing reagent LipoClear (LC), and 1:5 dilution (DIL). Lipemia-index (L-index) thresholds were established using endogenously lipemic specimens and sera spiked with human-derived triglyceride-rich lipoproteins. ResultsThe ci8200 showed greater susceptibility to endogenous lipemic interference than would be expected based on vendor-derived limits established with Intralipid. Endogenous lipemia causes a negative interference on the ci8200 and a positive interference on the Integra. UC was generally the most reliable method of removing lipemic interference without impacting baseline CERU results. ConclusionsCERU assays on different platforms have varying susceptibility to lipemic interference. L-index thresholds derived using Intralipid may not accurately represent interference caused by endogenous lipemia.

Factors Causing Disagreement between Measured and Calculated Low Density Lipoprotein-Cholesterol (LDL-C) in Clinical Laboratory Services.

BackgroundSince measured low density lipoprotein-cholesterol (LDL-C) has been available in clinical laboratories, there have been concern about the disagreement between measured and calculated LDL-C and the factors causing their disagreement.Material/MethodsSerum lipid concentrations were collected from 1,339 medical records of patients admitted to hospital between 2013 and 2015. They were grouped by their total cholesterol (TC), triglycerides (TG), and high-density lipoprotein-cholesterol (HDL-C) concentrations and the agreement between measured and calculated LDL-C was statistically analyzed.ResultsA strong relationship was found between measured and calculated LDL-C. Significantly disagreements between measured and calculated LDL-C were found in all groups in 2013 and 2014 when lipids were analyzed by Cobas C501. Disagreements found in groups of low TG and low HDL-C concentrations in 2015 were when lipids were analyzed by Abbott Architect ci8200. In groups of calculated LDL-C <1.81 mmol/L, around 80% had the measured LDL-C >1.81 mmol/L. Among various atherogenic indices, non-HDL-C showed the strongest relationship with LDL-C, while TC to HDL-C ratio showed the strongest agreement with the LDL-C.ConclusionsThe disagreement between measured and calculated LDL-C in a clinical laboratory seemed to depend on the analytical system used, and was probably associated with individual laboratory variations.

Evaluation of Point of Care Test (POCT), i-CHROMA™ Serum C-Reactive Protein (CRP) Assay and Microalbumin Urine (MAU) Methods

Objectives: The objective of this study was to evaluate the performance of the Boditech i-CHROMA™ point-of-care testing (POCT) method for the quantification of serum CReactive Protein (CRP) and Urine Microalbumin (MAU) compared well with the traditional Abbott Architect Ci8200 laboratory method. Design and Methods: Serum samples of CRP (n=44) and urine samples for MAU estimation (n=25) were analysed at the Homerton University Hospital using the routine laboratory method (Abbott Architect Ci8200) and the Boditech i-CHROMA™ POCT method. Results: The i-CHROMA™ CRP and MAU method showed good correlation with that of the Abbott Architect Ci8200: r2=0.905 and r2=0.987 respectively. Overall, there was a slight negative bias seen with the i-CHROMA™ CRP method (bias=-8.15, bias difference=-9.05%) and a negative bias seen with the i-CHROMA™ MAU method (bias=35.84, bias difference=-27.88%). Conclusion: The Boditech i-CHROMA™ POCT method provide a reliable measurement of CRP and MAU and compared well with the traditional Abbott Architect Ci8200 laboratory method.

CLSI-based transference of the CALIPER database of pediatric reference intervals to Beckman Coulter DxC biochemical assays

BackgroundThe CALIPER program has established a comprehensive database of age- and sex-stratified pediatric reference intervals for over 85 common biochemical markers, largely using the Abbott ARCHITECT assays. To allow a broader application of the CALIPER database, we examined transference to 36 Beckman Coulter Synchron Unicel DxC800 assays, based on the CLSI C28-A3/EP9-A3 guidelines. MethodsPatient sample comparisons were performed for 36 biochemical assays using 200 serum specimens obtained from pediatric patients on the Abbott ARCHITECT ci8200 and the Beckman Coulter DxC800. For each analyte, R2 values were calculated to assess the quality of correlation between the platforms. Statistical criteria used to assess transferability included a) regression analysis to create the equation of the line of best fit, b) standardized residual, c) Bland–Altman, and d) quantile–quantile plots. Transferred reference intervals were further verified by analyzing serum samples from 100 healthy children from the CALIPER cohort on the Beckman Coulter system. ResultsThe reference intervals for most of the assessed analytes were transferable to Beckman Coulter assays (31 out of 36 studied) and the newly calculated reference intervals were verified through analysis of CALIPER reference samples (28 out of 31). Eighteen assays demonstrated excellent correlation (R2≥0.95), and 13 assays showed strong correlation (0.77≤R2≤0.94). ConclusionThe current study allowed successful transference of a large number of biochemical markers from the CALIPER database to assays on the Beckman Coulter DxC800 platform. Transference should facilitate broader application of CALIPER reference intervals at pediatric centers using DxC biochemical assays.

Harmonising liver function tests: aussie normals and method harmonisation

The Aussie Normals study is a community-based a priori study to determine reference intervals (RIs) in a healthy Australian population. A cohort of 1856 ACT based volunteers was recruited who were broadly representative of the Australian population. Analyses were performed on the Abbott Architect ci8200 or ci16200 analysers using proprietary methods with results reviewed clinically to screen for analytes to be excluded from further analysis due to disease or indices of possible interference. Age and gender differences were seen with ALT, AST, GGT, ALP, and gender only differences with LD. Transaminase RIs determined in this study are similar to those proposed by the AACB. Statistically significant differences were obtained for ALT and GGT, between those subjects with a BMI of 18.5–24.99 kg/m 2 and those with a BMI >25.0 kg/m 2 . No differences were seen between those volunteers with a BMI 25.0–29.99 and those with a BMI >30.0. The average female and male BMI was 25.4 kg/m 2 and 26.0 kg/m 2 , respectively. A bias study sponsored by the AACB demonstrated that analytical methods used for liver function tests were generally well harmonised. A lesser degree of harmonisation was seen between GGT methods and the transaminase assays showed method differences associated with P-5-P activation.

Falsely raised whole blood chloride caused by systemic absorption of cerium nitrate cream for burns

Whole blood, serum or plasma chloride is almost exclusively measured by potentiometry with an ion-selective chloride electrode which utilizes membrane selectivity to chloride ions. Other anions such as bromide, iodide and thiosulphate can interfere but usually are not present in high enough concentration to cause significant cross reactivity. A patient from our burns unit had serial chloride measurements on a Radiometer ABL800 blood gas analyser. The results were higher in contrast to plasma measurements on the Abbott Architect Ci8200, which were within reference intervals and in line with the patient's pathophysiological status. This indicated a likely interference with the blood gas analyser chloride estimation. The chloride results on the ABL800 for 3rd, 4th and 5th day after the burn accident were 170, 137 and 119 mmol/L. Corresponding plasma chloride results on the Ci8200 were all around 105 mmol/L. Nitrate was found to be markedly elevated in these samples, and the results were 6.7, 4.9 and 1.1 mmol/L, respectively (reference limit < 0.08 mmol/L). To further demonstrate nitrate was the causative agent, pooled plasma spiked with 7 mmol/L of sodium nitrate caused a rise in the ABL800 chloride from 105 to 202 mmol/L. Later we confirmed that the patient was topically medicated with cerium nitrate cream (Flammacerium®, Sinclair IS Pharma, UK) for his burns. In summary, the results clearly indicated nitrate was the interferent with the ABL800 chloride estimation and the source was the topical burns cerium nitrate cream.

Thyroid-stimulating hormone reference range and factors affecting it in a nationwide random sample.

Previous studies with mainly selected populations have proposed contradicting reference ranges for thyroid-stimulating hormone (TSH) and have disagreed on how screening, age and gender affect them. This study aimed to determine a TSH reference range on the Abbott Architect ci8200 integrated system in a large, nationwide, stratified random sample. To our knowledge this is the only study apart from the NHANES III that has addressed this issue in a similar nationwide setting. The effects of age, gender, thyroid peroxidase antibody (TPOAb)-positivity and medications on TSH reference range were also assessed. TSH was measured from 6247 participants randomly drawn from the population register to represent the Finnish adult population. TSH reference ranges were established of a thyroid-healthy population and its subpopulations with increasing and cumulative rigour of screening: screening for overt thyroid disease (thyroid-healthy population, n=5709); screening for TPOAb-positivity (risk factor-free subpopulation, n=4586); and screening for use of any medications (reference subpopulation, n=1849). The TSH reference ranges of the thyroid-healthy population, and the risk factor-free and reference subpopulations were 0.4-4.4, 0.4-3.7 and 0.4-3.4 mU/L (2.5th-97.5th percentiles), respectively. Although the differences in TSH between subgroups for age (p=0.002) and gender (p=0.005) reached statistical significance, the TSH distribution curves of the subgroups were practically superimposed. We propose 0.4-3.4 mU/L as a TSH reference range for adults for this platform, which is lower than those presently used in most laboratories. Our findings suggest that intensive screening for thyroid risk factors, especially for TPOAb-positivity, decreases the TSH upper reference limit.

Population-based pediatric reference intervals for HbA1c, bilirubin, albumin, CRP, myoglobin and serum enzymes

Background. Many previous studies on reference intervals are hampered by the inclusion of only hospital-based populations of children and adolescents. Methods. This study included 694 children, evenly distributed from 6 months to 18 years of age. They were recruited as volunteers at child care units and schools. All subjects were apparently healthy. A questionnaire on diseases and medications was filled out by parents and by the older children. Results. Alanine aminotransferase (ALT), albumin, aspartate aminotransferase (AST), bilirubin, conjugated bilirubin, C-reactive protein (CRP), creatine kinase (CK), Gamma-glutamyltransferase (GGT), HbA1c (mono S and IFCC calibrations), lactate dehydrogenase (LD), myoglobin and panceratic amylase were analyzed on Abbott Architect ci8200, and for HbA1c on Tosoh G7 and a mono S-system. Age- and gender-related 2.5th and 97.5th percentiles were estimated. For some analytes the differences to comparable studies were substantial. Conclusion. The study gives age- and gender-specific pediatric reference intervals, measured with modern methods for a number of important analytes. The results emphasize the importance to evaluate pediatric reference intervals in different populations and ethnic groups including only healthy subjects.

Population-based pediatric reference intervals for hematology, iron and transferrin

Reference intervals are crucial decision-making tools aiding clinicians in differentiating between healthy and diseased populations. However, for children such values often are lacking or incomplete. Blood samples were obtained from 689 healthy children, aged 6 months to 18 years, recruited in day care centers and schools. Hematology and anemia analytes were measured on the Siemens Advia 2120 and Abbott Architect ci8200 platforms (hemoglobin, erythrocyte volume fraction [EVF], erythrocytes, mean corpuscular volume [MCV], mean corpuscular hemoglobin [MCH], mean corpuscular hemoglobin concentration [MCHC], reticulocytes, leukocytes, lymphocytes, monocytes, neutrophils, eosinophils, basophils, platelets, iron, transferrin, transferrin saturation). Age- and gender-specific pediatric reference intervals were defined by calculating 2.5th and 97.5th percentiles. The data generated is primarily applicable to a Caucasian population, but could be used by any laboratory if verified for the local patient population.

Hemolysis reflex rules based on the evaluation of hemolysis interference on Abbott ARCHITECT Ci8200 assays

Hemolysis reflex rules based on the evaluation of hemolysis interference on Abbott ARCHITECT Ci8200 assays

Reference intervals on the Abbot Architect for serum thyroid hormones, lipids and prolactin in healthy children in a population-based study

Pediatric reference intervals for thyroid hormones, prolactin and lipids are of high clinical importance as deviations might indicate diseases with serious consequences. In general, previous reference intervals are hampered by the inclusion of only hospital-based populations of children and adolescents. The study included 694 children, evenly distributed from 6 months to 18 years of age. They were recruited as volunteers at child care units and schools. All subjects were apparently healthy and a questionnaire on diseases and medications was filled out by parents and by the older children. TSH, free T4, free T3, total cholesterol, LDL, HDL, triglycerides and prolactin were analyzed on Abbott Architect ci8200. Age- and gender-related 2.5 and 97.5 percentiles were estimated. The thyroid hormone levels were similar to previous data for the Abbott Architect platform, but exhibited differences from studies performed with other methods. Prolactin displayed wide reference ranges, but relatively small age-related changes, and a marginal difference between sexes during adolescence. Reference intervals for lipids in the different age groups are known to vary geographically. Levels of LDL and total cholesterol were higher than those reported for children in Canada, but lower than those reported for children in China. The study gives age- and gender- specific pediatric reference intervals, measured with modern methods for a number of important analytes. The results presented here differ from previously recommended reference intervals. In many earlier studies, retrospective hospital-based reference intervals, which may include various sub-groups have been presented. By non-hospital studies it is possible to avoid some of these biases.

Population-based pediatric reference intervals for general clinical chemistry analytes on the Abbott Architect ci8200 instrument

Reference intervals are crucial decision-making tools aiding clinicians in differentiating between healthy and diseased populations. However, for children such values often are lacking or incomplete. Blood samples were obtained from 692 healthy children, aged 6 months to 18 years, recruited in daycare centers and schools. Twelve common general clinical chemistry analytes were measured on the Abbott Architect ci8200 platform; sodium, potassium, chloride, calcium, albumin-adjusted calcium, phosphate, magnesium, creatinine (Jaffe and enzymatic), cystatin C, urea and uric acid. Age- and gender specific pediatric reference intervals were defined by calculating the 2.5th and 97.5th percentiles. The data generated is primarily applicable to a Caucasian population when using the Abbott Architect platform, but could be used by any laboratory if validated for the local patient population.