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Table 2 TB-IGRA detection criterion

From: Usefulness of interferon-γ release assay for the diagnosis of sputum smear-negative pulmonary and extra-pulmonary TB in Zhejiang Province, China

N

P – N

T – N

Results

≤ 400

Any value

≥ 14 and ≥ \( \frac{N}{4} \)

Positive

≥ 20

< 14

Negative

≥ 14 but < \( \frac{N}{4} \)

< 20

< 14

Uncertain

≥ 14 but < \( \frac{N}{4} \)

≥ 400

Any value

Any value

  1. T Testing tube (T) content value, N Negative control tube (N) content value, P (Unit: pg/ml) Positive control tube (P) content value
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Infectious Diseases of Poverty

ISSN: 2049-9957

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