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Variation in the sensitivity of HBsAg screening kits
D R Palmer1, K R Perry, P P Mortimer
1PHLS Hepatitis and Retrovirus Laboratory, Virus Reference Division, London, UK.
Transfusion Medicine (Oxford, England)
|December 1, 1996
Summary
Significant variations in Hepatitis B surface antigen (HBsAg) kit sensitivity were found. Testing revealed differences in detecting low-level carriers and seroconversion, impacting diagnostic accuracy.
Area of Science:
- Clinical Chemistry
- Virology
- Diagnostic Assays
Background:
- Hepatitis B virus (HBV) infection remains a global health concern.
- Accurate detection of Hepatitis B surface antigen (HBsAg) is crucial for diagnosis and management.
- Commercial HBsAg kits vary in performance, necessitating sensitivity assessments.
Purpose of the Study:
- To evaluate and compare the sensitivity of commercially available HBsAg detection kits.
- To identify kits with superior performance in detecting low-level HBsAg and during seroconversion.
Main Methods:
- Assessed 15 HBsAg kits from 14 manufacturers.
- Tested 150 HBsAg-positive sera, sera from low-level carriers, and seroconversion panels.
- Utilized international standards (British HBsAg Working Standard, NIBSC/UKBTS HBsAg Monitor Sample) for calibration.
Main Results:
- Five kits failed to detect HBsAg in at least one routine positive sample.
- Significant differences observed in detecting low-level carriers and HBsAg during seroconversion.
- The most sensitive kit detected HBsAg in 79 seroconversion specimens, while the least sensitive detected only 31.
- Substantial variation in reactivity with international standards was noted, with only three kits consistently reactive.
Conclusions:
- There is considerable variability in the sensitivity of available HBsAg kits.
- Kit performance differences can impact the accurate diagnosis and monitoring of Hepatitis B infection.
- Healthcare providers should be aware of these performance variations when selecting HBsAg detection assays.