Interpreting Tuberculosis Test Results with the T-SPOT.TB test:
- Interferon-gamma is captured and presented as spots from T cells sensitized to TB infection
- Results are interpreted by subtracting the spot count in the negative (NIL) control from the spot count in Panels A and B
- Positive > 8 spots
- Negative < 4 spots
- Borderline 5, 6, or 7 spots
T-SPOT is a registered trademark of Oxford Immunotec Ltd.