What Is Chronic Hepatitis B?
Chronic hepatitis B is a long-term infection of the liver caused by the hepatitis B virus (HBV), which persists for more than six months. It can lead to progressive liver damage, increasing the risk of scarring (fibrosis and cirrhosis), liver failure, and liver cancer. Unlike acute hepatitis B, which may resolve on its own, chronic infection requires ongoing medical monitoring and management to prevent complications.

Stages of Chronic Hepatitis B
Chronic hepatitis B progresses through different stages depending on viral activity and the immune system’s response. While some individuals may remain stable for years, others may experience worsening liver damage over time. The main stages include:
- Immune Tolerant Phase – The hepatitis B virus (HBV) multiplies rapidly in the body, but the immune system does not attack it, resulting in little to no liver damage. This phase is more common in younger individuals.
- Immune Active Phase – The immune system recognises and attacks HBV-infected liver cells, leading to inflammation and potential liver scarring.
- Inactive Carrier State – The virus remains in the body but at very low levels, meaning there is little to no liver inflammation or damage. However, regular monitoring is still needed.
- Reactivation Phase – The virus becomes active again, increasing viral replication and triggering liver inflammation, which can lead to further complications.
Over time, repeated inflammation can cause extensive liver scarring (cirrhosis), increasing the risk of liver failure or liver cancer. Since chronic hepatitis B does not always follow a predictable disease progression, regular monitoring is essential to detect changes early and guide appropriate management.
Chronic Hepatitis B Symptoms
Many individuals with chronic hepatitis B experience no symptoms for years, but as liver damage progresses, they may develop:
- Fatigue and weakness
- Loss of appetite
- Nausea or vomiting
- Abdominal pain, particularly in the upper right side
- Jaundice (yellowing of the skin and eyes)
- Dark urine and pale stools
- Unexplained weight loss
- Swelling in the legs or abdomen (advanced cases)
Symptoms are more likely to appear or worsen in later stages of the disease, making regular screening important for early detection and timely management.

Chronic Hepatitis B Causes
Chronic hepatitis B develops from a long-term infection with the hepatitis B virus, which can be transmitted through:
- Mother-to-child transmission – This is the most common cause of chronic hepatitis B, occurring when an infected mother passes the virus to her baby during childbirth. Because newborns and young children are more vulnerable, they have a significantly higher chance of developing chronic infection.
- Unprotected sexual contact – HBV can spread through bodily fluids, including blood, semen, and vaginal secretions.
- Sharing needles or syringes – Individuals who use injectable drugs or receive unsafe medical injections are at higher risk.
- Household transmission – Sharing personal items like razors or toothbrushes with an infected person can increase the risk.
- Blood transfusions and medical procedures – Although rare in countries with strict screening, HBV can be transmitted through contaminated blood products.
Chronic Hepatitis B Diagnosis & Tests
Diagnosis of chronic hepatitis B involves blood tests and imaging to assess liver function, the extent of liver damage, and the level of virus present in the body.
- Hepatitis B Surface Antigen (HBsAg) Test – Detects the presence of hepatitis B virus (HBV) in the blood, indicating an ongoing infection.
- Hepatitis B e Antigen (HBeAg) and Hepatitis B e Antibody (HBeAb) Test – Determines whether the virus is actively replicating, which can influence disease progression and treatment decisions.
- HBV DNA Test – Measures the amount of viral DNA in the blood to assess the severity of the infection and monitor response to treatment.
- Liver Function Tests (LFTs) – Evaluates liver enzyme levels, including alanine aminotransferase (ALT) and aspartate aminotransferase (AST), which indicate liver inflammation. Elevated levels may suggest active liver damage.
- Imaging Tests – Liver elastography, ultrasound, or MRI help assess liver stiffness, detect scarring, and monitor disease progression. In some cases, a liver biopsy may be required for a more detailed assessment of liver damage.

To differentiate between acute and chronic infection, the hepatitis B surface antigen (HBsAg) test must be persistently positive for at least six months before a chronic diagnosis is confirmed.
Treatment & Management of Chronic Hepatitis B
While chronic hepatitis B has no definitive cure, treatment aims to control viral replication, prevent liver damage, and reduce the risk of complications.
Treatment Approach | Purpose |
---|---|
Antiviral Medications |
|
Regular Monitoring |
|
Lifestyle Modifications |
|
Vaccination and Preventive Measures |
|
Hepatitis B Screening Price in Singapore
At ATA Medical, we provide screening for hepatitis B and if required, treatment for chronic or acute infections. Our prices are as follows:
Test | Price* |
---|---|
Consultation | From $38.15 |
Blood Tests | |
HEP 1 Profile Hepatitis B Surface Antigen (HBsAg), Hepatitis B Surface Antibody (HBsAb) |
$21.80 |
HEP 5 Profile Hepatitis B Surface Antigen (HBsAg), Hepatitis B Surface Antibody (HBsAb), Hepatitis B e Antigen (HBeAg), Hepatitis B e Antibody (HBeAb), Alpha-Fetoprotein (AFP), ALT/SGPT, AST/SGOT, Gamma GT (GGT) |
$87.20 |
Liver Function Test A Total Bilirubin, Alkaline Phosphatase [ALP], ALT/SGOT, AST/SGPT, Gamma GT |
$30.52 |
Liver Function Test B Total Bilirubin, Alkaline Phosphatase [ALP], ALT/SGOT, AST/SGPT, Gamma GT, Total Protein, Albumin, Globulin, A/G Ratio |
$34.88 |
Liver Function Test C Total Bilirubin, Alkaline Phosphatase [ALP], ALT/SGOT, AST/SGPT, Gamma GT, Total Protein, Albumin, Globulin, A/G Ratio, LDH, Hepatitis Bs Antigen & Antibody, Hepatitis A Total IgG, Alpha Fetoprotein [AFP] |
$91.56 |
Imaging Tests | |
Ultrasound Liver | $150.42 |
Ultrasound Liver Elastography | $196.20 |
MR Liver Elastography | $566.80 |
MRI Abdomen (Kidney, Liver, Pancreas, Gallbladder & Spleen) | $1471.50 |
CT Liver (with contrast) | $1122.70 |
Vaccinations | |
Engerix-B® (Hepatitis B) | $54.50 / dose |
Twinrix® (Hepatitis A & Hepatitis B) | $119.90 / dose |
Havrix® (Hepatitis A) | $98.10 / dose |
Conclusion
Chronic hepatitis B is a lifelong condition that requires early detection,
regular monitoring, and proper management to prevent complications such
as liver cirrhosis and cancer. While there is no cure, available treatments can help
control the virus, protect liver function, and improve long-term health outcomes.
At ATA Medical, we provide comprehensive hepatitis B screening and personalised
treatment plans to help you manage your condition with confidence. Schedule your
hepatitis B screening with us today.
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