Overview
HBV DNA PCR (Qualitative) is a molecular test used to detect the presence or absence of Hepatitis B virus DNA in blood. Hepatitis B virus is a DNA virus and one of the most common causes of chronic liver disease worldwide.
HBV is transmitted mainly through blood exposure, sexual contact, and from mother to child at birth. Clinical presentation can range from subclinical infection to symptomatic hepatitis. Long-term complications include cirrhosis and hepatocellular carcinoma.
Detection of HBV DNA is essential for confirming infection, identifying early or occult infection, making treatment decisions, and monitoring disease progression.
Symptoms
Many individuals with HBV infection may initially remain asymptomatic. When symptoms occur, they may include fever, fatigue, loss of appetite, nausea, vomiting, abdominal pain, and jaundice.
The severity of symptoms varies depending on the stage of infection and the host’s immune response. Some patients may present only during routine screening or preoperative evaluation.
Causes
HBV infection occurs when blood or other body fluids from an infected person enter the body of a non-infected individual. Transmission commonly occurs through unprotected sexual contact, sharing needles or injection equipment, blood transfusion, or perinatal transmission from mother to newborn.
The incubation period ranges from 30 to 180 days. HBV is highly infectious and can persist in the body, especially when infection occurs during infancy or childhood.
Risk Factors
Individuals at higher risk include healthcare workers, patients receiving blood transfusions, people with multiple sexual partners, injection drug users, and newborns of HBV-infected mothers.
Risk also increases in cases of unprotected sex, shared needles, immunosuppression, and lack of vaccination. HBV DNA testing is routinely performed during hospital admissions, preoperative workups, and antenatal care.
Prevention
Prevention focuses on early detection, vaccination, and safe practices. Screening of high-risk individuals and pregnant women helps prevent transmission and complications.
Safe sexual practices, avoidance of needle sharing, proper sterilization of medical equipment, and timely vaccination are key preventive measures. Early diagnosis using HBV DNA PCR allows prompt intervention and reduces the risk of chronic liver disease.
