Explore the reasons affecting the consistency of reference intervals established by two types of indirect methods for 34 biochemical analytes
Ma Chaochao, Yin Yicong, Liu Li, Liu Qian, Liu Xin, Zhang Ying, Xia Liangyu, Qiu Ling
Abstract
ObjectiveTo compare the differences of reference intervals (RI) established by two types of indirect methods for 34 biochemical analytes, and to explore the possible factors that affect the consistency of the two methods.
MethodsThis was a retrospective study. Based on data of albumin (Alb), alkaline phosphatase (ALP), alanine aminotransferase (ALT), apolipoprotein A1(ApoA1), ApolipoproteinB (ApoB), aspartate aminotransferase (AST), calcium (Ca), cholinesterase (ChE), chloride (Cl), creatinine (Cr), high-sensitivity C-reactive protein (hsCRP), Cystatin (CysC), direct bilirubin (DBil), free fatty acid (FFA), glycated albumin(GA), gamma-glutamyltransferase (GGT), glucose (Glu), high density lipoprotein cholesterol (HDL-C), potassium (K), lactate dehydrogenase (LD), low density lipoprotein cholesterol (LDL-C), lipoprotein a [Lp (a)], sodium (Na), phosphorus (P), prealbumin (PA), superoxide dismutase (SOD), total bile acid (TBA), total bilirubin (TBil), total cholesterol (TC), total carbon dioxide (TCO2), triglyceride (TG), total protein (TP), uric acid (UA) and urea (UR) of individuals who underwent physical examination at Peking Union Medical College Hospital from January 1, 2018 to December 31, 2019, Box-Cox algorithm was used to improve the data distribution and Tukey method was used to identify outliers. Variance component model was established, and standard deviation ratio (SDR) was calculated to determine whether the RIs of 34 biochemical analytes should be established according to age or sex The non-parametric method and kosmic algorithm were used to establish the RIs and 90% confidence intervals (CIs) of 34 biochemical analytes, and the coincidence of the 90% CIs of the reference limits for two methods was compared.
ResultsThe skewness coefficients of ALP(male, female18-59), ALT, AST, hsCRP, DBil, GGT, Lp (a), TBA, TBil, TG, Glu, HDL-C(male) and CysC, GA, UR in the elderly group deviated from 0, and their kurtosis coefficients also deviated from 3. For these biochemical analytes, the point estimates of the RIs established by the two methods differed greatly and the 90% CIs did not overlap. The analytes with good normality were Alb, ApoA1, ApoB, Ca, ChE, Cl, Cr(E), CysC(18-59), FFA, GA(18-59), HDL-C(female), K, LDL-C, Na, P, PA, SOD, TC, TCO2, TP and UR. The consistency is good. Except for Ca, 90% CIs of reference limits for some analyte between the two methods coincide with each other.
ConclusionsThe consistency of different indirect methods is affected by the normality of data.
Key words:
Data mining; Biomarker; Reference Values
Contributor Information
Ma Chaochao
Department of Laboratory Medicine,Peking Union Medical College Hospital,Peking Union Medical College &
Chinese Academy of Medical Science,Beijing 100730,China
Yin Yicong
Department of Laboratory Medicine,Peking Union Medical College Hospital,Peking Union Medical College &
Chinese Academy of Medical Science,Beijing 100730,China
Liu Li
Department of Laboratory Medicine,Peking Union Medical College Hospital,Peking Union Medical College &
Chinese Academy of Medical Science,Beijing 100730,China
Liu Qian
Department of Laboratory Medicine,Peking Union Medical College Hospital,Peking Union Medical College &
Chinese Academy of Medical Science,Beijing 100730,China
Liu Xin
Department of Laboratory Medicine,Peking Union Medical College Hospital,Peking Union Medical College &
Chinese Academy of Medical Science,Beijing 100730,China
Zhang Ying
Department of Laboratory Medicine,Peking Union Medical College Hospital,Peking Union Medical College &
Chinese Academy of Medical Science,Beijing 100730,China
Xia Liangyu
Department of Laboratory Medicine,Peking Union Medical College Hospital,Peking Union Medical College &
Chinese Academy of Medical Science,Beijing 100730,China
Qiu Ling
Department of Laboratory Medicine,Peking Union Medical College Hospital,Peking Union Medical College &
Chinese Academy of Medical Science,Beijing 100730,China