Fluid AnalysisGastroenterology

Ascitic Fluid ADA Levels

Normal Range
< 30 U/L
Sample Type
Ascitic Fluid
Fasting
No
Unit
U/L

Function

Adenosine Deaminase (ADA) is an enzyme involved in purine metabolism. It is primarily released by T-lymphocytes and macrophages during their activation and proliferation. In the context of ascitic fluid (fluid collected from the peritoneal cavity), the ADA level serves as a surrogate marker for cellular immune responses.

Why it is Ordered

This test is crucial in the differential diagnosis of ascites, particularly when Tuberculosis Peritonitis (TBP) is suspected. In many regions where TB is endemic, ADA provides a rapid, cost-effective alternative to fluid cultures (which take weeks) or peritoneal biopsy (which is invasive). It helps clinicians distinguish between tuberculous ascites and other causes such as cirrhosis or malignancy.

Associated Conditions

  • Tuberculous Peritonitis: Characterized by very high ADA levels (often >30-40 U/L).
  • Peritoneal Carcinomatosis: Some cancers involving the peritoneum can cause moderately elevated ADA.
  • Lymphoma: Certain hematologic malignancies can lead to increased T-cell activity in the fluid.
  • Cirrhosis: Typically presents with very low ADA levels unless a secondary infection is present.
  • Bacterial Peritonitis: Non-TB bacterial infections may cause mild elevations due to neutrophil activity.

Check Your Result

Check Your Result

Interactive
U/L

Enter your lab result to see where you stand compared to the standard reference range.

Why Context Matters

ADA levels can be misleading if the patient is immunocompromised (e.g., HIV/AIDS), as the T-cell response may be blunted, leading to a false-negative result even in the presence of TB. Conversely, 'false positives' can occur if the ascitic fluid is contaminated with blood during the procedure (traumatic tap), as red blood cells and serum contain ADA. A second opinion or confirmatory biopsy is vital if the clinical picture and the ADA level are discordant.

Lab ranges are statistical averages, not biological laws. "Normal" for a 20-year-old male isn't normal for a 60-year-old female.

Clinical References

Source-of-truth databases and clinical guidelines for Ascitic Fluid ADA Levels:

Research & Guidelines

Related Indicators

Pleural Fluid Proteins

View Range
DR

Medically Reviewed by Dr. Binoy Babu, MBBS

Board Certified Doctor • 10+ Years Clinical Experience

Dr. Babu is a practicing physician dedicated to empowering patients with clear, actionable medical information. He founded 2opi to bridge the gap between complex lab reports and patient understanding, ensuring everyone has access to a reliable second opinion.

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