610-P: Research on Consistency of Mass Spectrometry and Enzymatic Methods for Saliva 1,5-anhydroglucitol Measurement

Abstract

Objective: To evaluate the agreement of different measurement methods of saliva 1,5-anhydroglucitol (1,5-AG) in different glucose metabolism populations. Methods: A total of 175 healthy volunteers (21–65 years, 58 males and 117 females) with normal glucose tolerance (NGT) and 80 diabetic patients (18–70 years, 44 males and 36 females) were enrolled from January 2018 to June 2019 and saliva was collected by saliva collection tube. Saliva 1,5-AG was measured using both enzymatic and mass spectrometry methods and serum 1,5-AG was determined by enzymatic method. Results: In subjects with NGT, the serum and saliva 1,5-AG levels detected by enzymatic method were both significantly positively correlated with the saliva 1,5-AG levels detected by liquid chromatography-mass spectrometry (LC-MS) (r = 0.247 and 0.523, respectively, both P < 0.05). However, there was no significant correlation between saliva and serum 1,5-AG levels detected by enzymatic method (r =-0.074, P = 0.333). In diabetic patients, the serum and saliva 1,5-AG levels detected by enzymatic method were both significantly positively correlated with the saliva 1,5-AG levels detected by gas chromatography-mass spectrometry (GC-MS) (r = 0.284 and 0.423, respectively, both P < 0.05). There was no significant correlation between saliva and serum 1,5-AG levels detected by enzymatic method (r ='0.079, P = 0.487). Conclusion: Both the serum and saliva 1,5-AG levels detected by enzymatic method have good agreement with saliva 1,5-AG levels detected by mass spectrometry method. The saliva and serum 1,5-AG levels detected by enzymatic method are not well correlated, so the enzymatic detection of saliva 1,5-AG needs further improvement for clinical practice. Disclosure Y. Bao: None. C. Jian: None. A. Zhao: None. X. Ma: None. W. Lu: None. W. Zhu: None. Y. Wang: None. J. Zhou: None.