Xu L, Wang X, Ma R, Zeng X, Wu B, Hu L, Li Y. False decrease of HBsAg S/CO values in serum with high-concentration rheumatoid factors.
Clin Biochem 2013;
46:799-804. [PMID:
23537796 DOI:
10.1016/j.clinbiochem.2013.03.013]
[Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2013] [Revised: 03/12/2013] [Accepted: 03/15/2013] [Indexed: 10/27/2022]
Abstract
OBJECTIVES
To investigate whether high-concentration RFs cause false decrease of S/CO values of serum HBsAg.
DESIGN AND METHODS
Serum HBsAg was determined in 100 RF-positive sera using one-step ELISA. Twenty-three HBsAg-negative sera with high-concentration RFs were selected randomly to perform dilution with mixed normal sera. Serum models consisting of HBsAg and high-concentration RFs were made by blending high-concentration RFs and HBsAg-positive sera at the ratio of 9:1.
RESULTS
In the 23 samples, one-step ELISA showed that HBsAg-positive rate was 69.57% at dilution of 1:2, 60.87% at dilution of 1:4 and 40.00% at dilution of 1:8, whereas two-step ELISA showed that it was 100% without any dilution. Thirty serum models were made and divided into six groups. Median S/CO value of HBsAg was 3.00 in control, whereas it ranged from 0.13 to 1.78 in the six groups.
CONCLUSIONS
High-concentration RFs cause false decrease of S/CO values of HBsAg using one-step ELISA.
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