Stability of hepatitis C virus RNA in serum from samples collected in a closed-tube system for serum separation and transport, as measured by a quantitative competitive PCR assay

SUMMARY. Recovery of hepatitis C virus (HCV) RNA, after variable time intervals from collection, was assessed using a closed-tube system for collection, separation and transport (SST^(tm) tubes). Blood from four hepatitis C-infected patients was collected in 12 SST^(tm) tubes and centrifuged within 1 to 3 h of collection. Tubes were then left 0, 8, 12, 24. 48 and 72 h at room temperature and at 4°C before removing serum. Hepatitis C virus RNA levels were measured by quantitative polymerase chain reaction (PCR) using the AMPLICOR HCV MONITOR^(tm) assay. Hepatitis C virus RNA levels in these samples were stable for at least three days at both temperatures. Polymerase chain reaction signals never decreased by more than 0.5 log. The reproducibility of the assays showed that the quantitative PCR method can be used with the storage conditions tested here. Our data suggests that processing blood in SST^(tm) tubes may be very useful in following hepatitis C virus RNA titres in infected patients, especially those receiving treatment.