ANTI DNASE B

The Anti-DNase B Antibody Test is a specialized blood test that measures antibodies produced against Deoxyribonuclease B (DNase B), an enzyme released by Group A Streptococcus (Streptococcus pyogenes) bacteria. This test helps determine whether an individual has had a recent streptococcal infection, particularly when throat or skin infections have already resolved.

The Anti-DNase B Test is especially valuable for diagnosing complications that may develop after a streptococcal infection, such as acute rheumatic fever and post-streptococcal glomerulonephritis. It is often performed along with the Anti-Streptolysin O (ASO) Test to improve diagnostic accuracy, especially when the ASO result is normal but clinical suspicion remains high.

Benefits of the Test

• Detects antibodies produced after Group A Streptococcal infection.
• Helps diagnose post-streptococcal complications.
• Supports evaluation of acute rheumatic fever.
• Assists in diagnosing post-streptococcal glomerulonephritis.
• Complements the ASO antibody test.
• Helps physicians plan appropriate treatment and follow-up.

Why Doctors Recommend This Test

Doctors may recommend the Anti-DNase B Antibody Test for patients with symptoms or complications following a recent streptococcal infection, including:

• Persistent fever after a sore throat or skin infection
• Joint pain and swelling
• Heart inflammation associated with rheumatic fever
• Blood in the urine (hematuria)
• Swelling of the face, hands, or legs
• High blood pressure after infection
• Unexplained kidney inflammation
• History of recent strep throat or streptococcal skin infection

The test helps physicians determine whether a previous streptococcal infection is responsible for ongoing symptoms or autoimmune complications.

Preparation Before Test

• No fasting is required.
• Continue routine medications unless advised otherwise by your physician.
• Inform your healthcare provider about recent infections and current medications.
• A blood sample is collected for laboratory analysis.

Normal Reporting Time

Reporting Time: Usually 2–5 working days, depending on laboratory processing protocols.

Who Should Take This Test?

This test is recommended for:

• Individuals with suspected recent Group A Streptococcal infection.
• Patients with symptoms of acute rheumatic fever.
• Individuals suspected of post-streptococcal glomerulonephritis.
• Children and adults with unexplained joint pain after a strep infection.
• Patients being evaluated for post-infectious autoimmune complications.

Patient-Friendly Summary

The Anti-DNase B Antibody Test is a blood test that checks for antibodies produced after an infection caused by Group A Streptococcus bacteria. These bacteria commonly cause strep throat and certain skin infections. Even after the infection has cleared, the body continues producing Anti-DNase B antibodies for several weeks. Measuring these antibodies helps doctors determine whether a recent streptococcal infection is responsible for complications such as rheumatic fever or kidney inflammation. The test is safe, requires only a blood sample, and generally does not require fasting. Early diagnosis allows timely treatment and helps reduce the risk of long-term complications.