Test directory: Thiopurine Metabolites

Ordering Code 7794
Test Name Thiopurine Metabolites
Alias Thiopurine Metabolites, Whole Blood
6-Thioguanine (TG)
6-Methylmercaptopurine (MMP)
Purine antimetabolites
Preferred Specimen Whole Blood
Preferred Container EDTA, K2 (Lavender)
Optimum Volume 3 mL
Handling Instructions Send original tube, do not aliquot
Transport Requirements Oahu: Ambient
Airline: Refrigerated
Specimen Stability Ambient: 24 Hours
Refrigerated: 8 Days
Frozen: Not Stable
Rejection Criteria Clotted, Grossly hemolyzed, Hemolyzed
Avail. Stat NO
Analytic Time 7 Days
Methodology Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS)
Reference Lab  Mayo Medical Lab

Reference range(s)

The reference ranges listed below are valid on this date of June 29, 2025.
Component Age Male Norm Male Critical Low Male Critical High Female Norm Female Critical High Female Critical Low Units Add'l info
6-Thioguanine Nucleotides ALL nol/8x10(8)RE See report.
6-Methylmercaptopurine ALL nol/8x10(8)RE See report.