Hepatitis B Surface Ag (Quantitative)

This test is referred to another lab outside our network
This does not affect where samples are sent and where your results are issued.
Samples sent to King's College Hospital (KCH) Liver Unit referral laboratory for quantification of Hepatitis B surface antigen in serum. This is performed only for patients undergoing interferon treatment for Hepatitis B infection. This assay is available routinely Mon to Fri.
Clinical details: 
Quantitative Hepatitis B surface antigen levels have been shown to be helpful in predicting the likelihood of a sustained response to interferon therapy. NICE guidance recommends monitoring quantitative surface antigen levels along with hepatitis B DNA levels at the start of interferon treatment and at weeks 12, 24 and 48 of treatment.
Synonyms or keywords: 
HBV, HepB, surface antigen
International units per milliliter (IU/mL)
Sample type and Volume required: 
500 ul serum or 2.5 – 5ml Yellow Top Serum Separation Tube (SST) Clotted Blood (for serum). .
Turnaround time: 
14 working days
Storage and transport: 
Place labelled sample in a sealed sample bag and send to Central Specimen Reception (CSR). To prevent sample haemolysis please store samples in refrigerator if a delay in sending samples to CSR is unavoidable.
Infection Sciences Department at St Thomas' Hospital
020 7188 8008
St Thomas' Hospital
North Wing - 5th Floor
Westminster Bridge Road
London SE1 7EH
Core opening hours: Monday-Friday 0900-1730

For clinical advice or interpretation of results, please contact the laboratory in the first instance.

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Last updated: 06/10/2023