Adenosine Deaminase

Adenosine Deaminase (ADA) is an enzyme involved in purine metabolism and is closely linked with cell-mediated immunity, especially T-lymphocyte activity. Measuring ADA levels has strong clinical value in diagnosing and monitoring several diseases.

Key Clinical Significance

🔬 Tuberculosis (TB) Diagnosis

Elevated ADA levels in pleural fluid, ascitic fluid, pericardial fluid, and CSF are highly suggestive of tuberculosis.

ADA testing is widely used as a rapid, cost-effective supportive test for extrapulmonary TB, especially in high-TB-burden countries like India.

🫁 Pleural Effusion Evaluation

High ADA helps differentiate tubercular pleural effusion from malignant or parapneumonic effusions.

🧠 Tuberculous Meningitis

Increased ADA in CSF supports early diagnosis when microbiological confirmation is difficult.

🩸 Immune System Disorders

ADA deficiency is associated with Severe Combined Immunodeficiency (SCID).

Increased serum ADA is seen in conditions with immune activation.

🧬 Autoimmune & Inflammatory Diseases

Raised ADA levels may be observed in rheumatoid arthritis, systemic lupus erythematosus, and other chronic inflammatory conditions.

🧪 Liver Diseases

Serum ADA may be elevated in viral hepatitis, cirrhosis, and other hepatic disorders.

🧫 Oncology & Hematological Conditions

Increased ADA activity can be seen in leukemia, lymphoma, and other malignancies due to high lymphocyte turnover.