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Test Catalog

Test ID: INHP    
Isoniazid, Serum/Plasma

Reference Values Describes reference intervals and additional information for interpretation of test results. May include intervals based on age and sex when appropriate. Intervals are Mayo-derived, unless otherwise designated. If an interpretive report is provided, the reference value field will state this.

Usual therapeutic range in the treatment of tuberculosis:

1 - 7 mcg/mL. Toxic symptoms present at approximately 20 mcg/mL and greater.


Isoniazid is known to have limited stability in biological specimens which may be concentration and storage condition dependent. Negative or lower than expected results should be interpreted with caution.


Test Performed by: NMS Labs

                             3701 Welsh Road

                             PO Box 433A

                             Willow Grove, PA 19090-0437