Abstract
Delays between blood collection and analysis are inevitable, and samples are always stored in the refrigerator. The current study aimed to evaluate the stability of serum total cholesterol (TC), triglycerides (TG), total protein (TP), albumin and urea (URA) in horses and oxen after storage at -20°C. Sera from apparently healthy 20 male horses and 20 oxen were obtained and aliquots of serum were divided into 3 portions. The first tube was used for baseline (T0) measurement of analyte values, whereas the other two tubes, T1 and T2, were stored at -20°C for 1 and 2 months, respectively, and analyte measurement was done. Results showed that the stability of TP (g/dL), URA (mg/dL) and TC (mg/dL) in oxen was statistically significant (p<0.05). In horses, the stability of URA (mg/dL), TP (g/dL) and TG (mg/dL) were also statistically significant (p<0.05). Additionally, URA and TC in oxen exceed TEa following measurement at T2 and TG in horses following measurement at T1 and T2. Laboratories should consider the storage temperature and time for specific analytes among animals. Therefore, stability studies at various storage temperatures and times are recommended to fully validate the stability of the analytes.
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