Hepatitis B Guide

Hepatitis B is a liver infection caused by the hepatitis B virus, and it spreads through contact with infected blood, semen, or other body fluids. That means it can pass during sex, through shared needles, or from a mother to her baby during birth. Many adults who get hepatitis B clear the virus on their own within six months, but some develop a chronic infection that lasts a lifetime and raises the risk of liver damage and liver cancer. A safe and effective vaccine prevents hepatitis B, and the CDC recommends it for all infants and for most adults. Blood tests can tell whether you have an active infection, have recovered, or are immune.

How Hepatitis B Spreads

Hepatitis B spreads through contact with infected blood and body fluids. Common routes include sex without a condom, sharing needles or drug equipment, and sharing personal items like razors or toothbrushes. A mother can pass the virus to her baby during birth, which is why all pregnant people are screened.

The virus is not spread by casual contact, coughing, sneezing, or sharing food. It can survive outside the body for at least seven days, which is why it is considered highly contagious and why the vaccine is such an important tool.

Acute Versus Chronic Infection

An acute hepatitis B infection lasts less than six months. Most healthy adults clear the virus on their own and develop lifelong immunity. Symptoms may include fatigue, jaundice, dark urine, and stomach pain, though many people, especially young children, have none.

Chronic infection develops when the virus stays in the body longer than six months. The risk is highest in infants and young children, while most adults recover. Chronic hepatitis B requires monitoring and often treatment to prevent liver damage.

Prevention and Vaccination

The hepatitis B vaccine is the cornerstone of prevention. It is given in three doses and is recommended for all infants and for adults at higher risk, including healthcare workers, people with multiple partners, and people who inject drugs. The vaccine provides long lasting protection.

Using condoms, not sharing needles or personal items, and testing during pregnancy also prevent transmission. If you are not vaccinated, the series is the single most effective step you can take.

Testing and What Results Mean

Hepatitis B testing uses blood tests for three markers. The surface antigen shows an active infection, the surface antibody shows immunity from vaccination or recovery, and the core antibody shows past or ongoing infection. Together they give the full picture of your status.

Testing is recommended if you have symptoms, had a possible exposure, are pregnant, or want to confirm immunity. A simple blood draw covers all markers, and results guide vaccination, monitoring, or treatment.

Order Hepatitis B Surface Antigen Test Online