Test Overview
Test Methodology

High-Performance Liquid chromatography with Ultraviolet Detection (HPLC-UV)

Test Usage

Therapeutic Drug Monitoring

Reference Range *

The effective concentration range of isoniazid is dependent upon the minimum inhibitory concentration of the pathogen being treated. Toxic range: greater than 20 ug/mL.

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Limitations

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 Details
Days Set Up
Monday - Saturday
Analytic Time

5 - 9 days

Soft Order Code
MMLR
Laboratory
Sendout
Reference Laboratory
Mayo FISON (MedTox 360)
Section
Special Testing
Specimen Requirements
Collection Instructions

Collect specimen in a red top tube; do not use SST tube. Centrifuge, aliquot serum into a plastic vial and refrigerate (preferred) or freeze.

Rejection Criteria
SST tube not acceptable.
Yellow Top Tube
Red Top Tube
Normal Volume
2 mL serum
Minimum Volume
0.5 mL serum
Additional Information

Test sent to Mayo Medical Laboratories; performed by MedTox Laboratories.

Billing
CPT Code
80375
Fee Code
AA477
LOINC
3697-0
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