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.
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.
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
80375
Fee Code
AA477
LOINC
3697-0
NY State Approved
No