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Test Name:Azathioprine (Imuran®) as 6-Mercaptopurine
Test Number:994
Collect:2.0 mL Serum - Plain red
Container:MedTox Plastic Transfer Vial
Processing:Spin and separate
Transport/Stability:Refrigerated (preferred)
Ambient - 3 days
Frozen (OK)
Alternate Names:Imuran®
MSO
LAB994
Performing Lab:MedTox Scientific (402); R-MX
Days Set Up:Once a week
Expected TAT:6 days
Ref. Ranges:6-Mercaptopurine: <1000 ng/mL

Azathioprine is measured as the metabolite, 6-mercaptopurine. Therapeutic and toxic ranges have not been established. Usual therapeutic doses produce 6-mercaptopurine serum concentrations of less than 1000 ng/mL.
Collection/
Processing Details:
Trough levels are most reproducible.
Method:High Performance Liquid Chromatography with Ultraviolet Detection (HPLC-UV)
CPT Codes:G0480
Date Created:01/29/2004
Revised Date:02/01/2017