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What is Anti Tb Ab - IgA, IgG, IgM?

Serum based ELISA tests is used to detect the three types of antibodies IgG, IgA, IgM IgG antibodies appear when an infection becomes established. They indicate a good immunological response of the patient to the infection. IgG and IgM are analyzed together to detect reactivation cases in chronic infections. A successful therapy, noted by clinical signs and the negative culture, is often accompanied by an increase in IgG antibodies titers, followed of course by a decrease in IgG at the end of the therapy. IgA antibodies are applied in difficult cases presenting a lack of tuberculin reactivity. IgA antibodies strengthen the diagnosis in cases of suspected meningitis, pleuritis, pericarditis and AIDS syndrome

Purpose of Test

To Detect Tuberculosis.

Test of Result Interpretation

  • IgG: Adult: Equivocal 125.0 - 225.0, Negative: 0.0 - 125, Positive: > 225.0 U/ml
  • IgA: Negative: Upto 200, Borderline: 201 - 350, Positive: > 350 U/ml
  • IgM: Negative: < 0.8, Borderline: 0.8 - 1.0, Positive: > 1.0 OD.


No preparation required can collect the blood sample at any time.

Turnaround Time

8 Hrs