HBs Ag

The HBs Ag test is crucial for diagnosing hepatitis B, which can lead to serious health issues if not identified early. At IntroLab in Belgrade, you can schedule this test quickly and easily. Our professional team is ready to provide all the information you need and support you throughout the process, making your health our top priority.

What is HBs Antigen?

HBsAg, or hepatitis B surface antigen, is a protein found on the surface of the hepatitis B virus (HBV). It serves as the first marker to indicate the presence of the virus in a person’s blood. Testing for HBsAg is an important step in diagnosing hepatitis B and is used to identify individuals who are currently infected.

A positive HBsAg result indicates that a person is infected with HBV and has the potential to transmit the virus to others through blood or other bodily fluids. This infection can be either acute (a new infection lasting less than six months) or chronic (lasting six months or more).

People who test negative for HBsAg but have been exposed to HBV may develop antibodies against the antigen, known as anti-HBs. The presence of anti-HBs in the blood suggests a past infection with immunity against the virus or successful vaccination against hepatitis B.

When is the HBs Ag test performed?

The HBs Ag (hepatitis B surface antigen) test is a standard screening method for detecting active hepatitis B infection. Here are some common situations where HBsAg testing is advised:

• Pre-surgery screening: Patients scheduled for surgery are often tested to check their hepatitis B status.
• During pregnancy: Pregnant women are typically tested to prevent the transmission of the virus from mother to child during childbirth.
• Blood donation: Blood donors undergo HBsAg testing to ensure that they do not transmit HBV to recipients.
• People with hepatitis symptoms: Individuals showing symptoms such as jaundice, fatigue, or abdominal pain should be tested for hepatitis B.
• High-risk individuals: This group includes people who use injection drugs, those with multiple sexual partners, individuals with chronic liver disease, those exposed to hepatitis B (such as household members of infected individuals), and travelers to regions with high HBV prevalence.
• Monitoring of known HBV infections: For those already diagnosed with hepatitis B, HBsAg testing helps monitor treatment effectiveness and detect active viral replication.

What is Hepatitis B?

Hepatitis B is a liver infection caused by the hepatitis B virus (HBV). This virus can lead to both acute and chronic liver disease, with severity ranging from mild cases with no symptoms to serious conditions that can result in cirrhosis or liver cancer.

Symptoms of hepatitis B can vary and may appear anywhere from a few weeks to several months after exposure to the virus. Many people, particularly young adults and children may carry the hepatitis B virus without showing any symptoms. When symptoms do occur, they typically include:

• Yellowing of the skin and eyes (jaundice)
• Fatigue
• Nausea and vomiting
• Loss of appetite
• Abdominal pain, especially under the right rib cage
• Dark urine
• Pale stools
• Joint pain
• Fever

Some individuals with chronic hepatitis B may not exhibit any symptoms but can still spread the virus to others. This is why it is crucial for those who may have been exposed to the virus to get tested, even if they do not experience any symptoms.

Specifics and types of HBs Ag testing

In addition to the HBs Ag test, several other tests provide valuable information about different aspects of hepatitis B infection. Each test offers specific insights into the infection’s stage, activity, or the body’s immune response.

• HBs At: Indicates immunity to hepatitis B, either from a past infection or vaccination. The presence of these antibodies after an infection shows that the person has recovered and is now immune.
• HBc IgM At: Suggests an acute infection or a reactivation of a chronic infection. These antibodies appear early in the course of the infection.
• Total anti-HBc: These antibodies develop soon after anti-HBc IgM and are found in both acute and chronic infections. They remain in the body for life.
• HBe Ag: The presence of this antigen indicates a high level of infectiousness and active viral replication. In people with chronic infection, it may suggest a higher risk of developing cirrhosis or liver cancer.
• Anti-HBe: The development of these antibodies indicates a decrease in viral replication. Combined with other tests, it can help evaluate the disease stage and the potential need for treatment.

Each of these tests plays a significant role in diagnosing, monitoring, and treating hepatitis B. Based on the patient’s clinical condition and needs, a doctor may order one or a combination of these tests to gain a comprehensive understanding of the infection.