Laboratory Medicine ›› 2021, Vol. 36 ›› Issue (6): 609-614.DOI: 10.3969/j.issn.1673-8640.2021.06.007

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Establishment of the reference interval of small and dense low-density lipoprotein cholesterol in apparently healthy adults in Chengdu

LI Jing, QUAN Hui(), ZENG Zhirong, WEI Yi   

  1. Department of Clinical Laboratory,the Second Affiliated Hospital of Chengdu Medical College,China National Nuclear Corporation 416 Hospital,Chengdu 610051,Sichuan,China
  • Received:2020-06-29 Online:2021-06-30 Published:2021-06-30
  • Contact: QUAN Hui

Abstract:

Objective To establish the reference interval of small and dense low-density lipoprotein cholesterol(sd-LDL-C) in apparently healthy adults in Chengdu,and to analyze the correlation between sd-LDL-C and other blood lipid parameters. Methods A total of 846 apparently healthy adults with normal blood lipids aged 20 to 69 years,including 474 males and 372 females,were enrolled. They were classified according to ages(20-29 years old,30-39 years old,40-49 years old,50-59 years old and 60-69 years old groups) and sex(male and female groups). Plasma sd-LDL-C levels were determined by peroxidase method,and the levels of total cholesterol(TC),triglyceride(TG),high-density lipoprotein cholesterol(HDL-C),low-density lipoprotein cholesterol(LDL-C),apolipoprotein A1(apo A1)and apolipoprotein B(apo B) were also determined. The percentile method was used to establish the reference interval. The appropriate levels of blood lipids were indicated by medians(M)(P2.5-P97.5). Results There was statistical significance in plasma sd-LDL-C,TC,TG,HDL-C,LDL-C,apo A1 and apo B levels between male and female groups(P<0.05). Plasma sd-LDL-C levels in males aged from 20 to 49 years were higher than those in females of the same age group(P<0.05). Plasma sd-LDL-C level in males aged 50 to 59 years was higher than that in females(P>0.05). Plasma sd-LDL-C level in males aged 60 to 69 years was lower than that in females(P>0.05). There was statistical significance in the appropriate levels of sd-LDL-C,TC,TG,LDL-C and apo B among age groups(P<0.05),while there was no statistical significance in the appropriate levels of HDL-C and apo A1 in male group and HDL-C in female groups(P>0.05). The reference intervals of sd-LDL-C were 0.19-0.93,0.29-0.98,0.31-1.01,0.26-0.99 and 0.30-1.03 mmol/L for males aged 20 to 29,30 to 39,40 to 49,50 to 59 and 60 to 69 years,respectively,and they were 0.19-0.82,0.23-1.03,0.20-0.96,0.26-1.15 and 0.23-1.25 mmol/L for females,respectively. The sd-LDL-C was positively correlated with TC,TG,LDL-C and apo B(r values were 0.601,0.544,0.758 and 0.757,P<0.05),and it was negatively correlated with HDL-C and apo A1(r values were -0.256 and -0.123,P<0.05). Conclusions The reference interval of sd-LDL-C has been established in Chengdu.

Key words: Small and dense low-density lipoprotein cholesterol, Reference interval, Blood lipid

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