- Patient Preparation
- Serum separator tube.
- Specimen Preparation
- Allow specimen to clot completely at room temperature. Separate serum from cells ASAP or within 2 hours of collection.Transfer 0.5 mL serum to in an ARUP Standard Transport Tube. (Min: 0.05 mL) Parallel testing is preferred and convalescent specimens must be received within 30 days from receipt of the acute specimens. Mark specimens plainly as "acute" or "convalescent."
- Storage/Transport Temperature
- Unacceptable Conditions
- Contaminated, heat-inactivated, or hemolyzed specimens.
- After separation from cells: Ambient: 48 hours; Refrigerated: 2 weeks; Frozen: 1 year
0.425-0.500 OD: Equivocal - Repeat testing in 10-14 days may be helpful.
0.501 OD or greater: Positive - IgG antibody to Mycobacterium tuberculosis detected, which may indicate acute or active infection.
|Component Test Code*||Component Chart Name||LOINC|
|0051699||M. tuberculosis Antibody, IgG||54146-6|
- M tuberculosis Ab IgG