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Diagnosing different stages of hepatitis B infection using a competitive polymerase chain reaction assay Changotra, H; Dwivedi, A; Nayyar, AK & Sehajpal, PK Abstract Purpose: Different stages of hepatitis B virus (HBV) infection can be defined by serum HBV DNA levels. This study attempts to (1) investigate serum HBV DNA levels in inactive carriers and patients with chronic HBV (CHB) infection and (2) define cut-off value between inactive carriers and HBeAg (precore antigen of HBV) negative CHB patients in Indian population. Methods: One hundred and forty samples encompassing 42 inactive HBsAg carriers and 98 CHB patients (53 HBeAg-positive and 45 HBeAg-negative) were analysed. Serum HBV DNA levels were determined employing an in-house competitive polymerase chain reaction (cPCR) assay. Results: The HBeAg-positive patients were found to have the maximum median HBV DNA load, which was significantly higher than the HBeAg-negative ones (median; 1.25 x 10 8 vs. 2.30 x 10 5 copies/mL ; P < 0.05). Interestingly, the latter group has significantly higher HBV DNA levels than the inactive carriers (median; 2.30 x 10 5 vs. 4.28 x 10 3 copies/mL ; P < 0.05). The 2.5 x 10 4 copies/ml HBV DNA levels were optimal for discriminating CHB patients (HBeAg-negative) from inactive carriers with 75.6 and 78.6% sensitivity and specificity, respectively. Conclusions: Despite the extensive overlapping of HBV DNA levels in inactive carriers and HBeAg negative CHB patients, 2.5 x 10 4 copies/mL is the most favourable cut-off value to classify these individuals and would be imperative in the better management of this dreadful disease. Keywords Chronic hepatitis B, HBeAg, HBsAg, HBV DNA, inactive carriers, quantitation

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