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
Synonyms
    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.

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

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

    Billing
    CPT Code
    80299
    Fee Code
    AA477
    LOINC
    3697-0
    NY State Approved
    No