Email updates

Keep up to date with the latest news and content from BMC Clinical Pathology and BioMed Central.

Open Access Research article

Hepatitis B assays in serum, plasma and whole blood on filter paper

Theodor K Mayer1, Roberto L Vargas1, Ann E Knebel1, Scott A Williams2*, Sean P Culver2, Daniel M Clark3 and Louise R King4

Author Affiliations

1 Department of Pathology and Laboratory Medicine, Rochester General Hospital, 1425 Portland Ave, Rochester, NY, 14621, USA

2 Department of Chemistry, Rochester Institute of Technology, 85 Lomb Memorial Drive, Rochester, NY, 14623, USA

3 Printing Materials and Applications Laboratory, Rochester Institute of Technology, Rochester, NY, 14623, USA

4 Shyira Hospital, B.P. 26, Ruhengeri, Shyira, Rwanda

For all author emails, please log on.

BMC Clinical Pathology 2012, 12:8  doi:10.1186/1472-6890-12-8

Published: 20 May 2012

Abstract

Background

Screening and determining the immune status of individuals for hepatitis B is usually done by detecting hepatitis B surface antigen (HBsAg) and hepatitis B surface antigen-specific antibodies (HBsAb). In some countries with the highest viral burden, performing these assays is currently impractical. This paper explores the use of filter paper as a blood specimen transport medium.

Methods

Samples, chosen from routine clinical laboratory pool, were applied and dried onto filter paper. Eluates, from the paper samples, were analyzed as routine clinical specimens on ADVIA Centaur 5634® immunoassay analyzers using the standard HBsAg and HBsAb kits. Dried blood samples were subjected to a range of environmental conditions in order to assess stability.

Results

After drying and elution the assays showed linearity and precision comparable to clinical assays performed on fresh serum. Elutions at various times during a 149 day incubation period showed very little variability in the Index numbers. All analytes were temperature stable except for a decrease in the HBsAg signal at 42°C.

Conclusions

Filter paper is an acceptable storage and transport medium for serum to be used in the detection of hepatitis B markers if atmospheric variability can be controlled. HBsAg, HBsAb and HBcAb are all stable for at least five months under storage conditions below room temperature. Drying specimens, particularly serum, on filter paper at remote locations, offers a reasonable solution to the problem of hepatitis surveillance in underdeveloped regions, although some attempt at temperature control might be desirable.

Keywords:
Hepatitis B; Dried blood spot; Surface antigen; Surface antibody