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Test Code TPMT GEN TPMT Genetics Assessment

Clinical System Name

TPMT Genetics Assessment


Pro-PredictR TPMT Genetics AssessmentTBG

Thiopurine Methyltransferase, Genetics Assessment


TPMT Genetics is an analysis to determine a person's ability to produce thiopurine methyltransferase (TPMT) activity to identify patients at risk for acute toxicity from 6-MP or azathioprine. The distribution of TPMT activity is trimodal; homozygous normal (89%), heterozygous (11%), and homozygous recessive (0.3%). Approximately 1 in 1213 individuals may have a low TPMT enzyme activity (homozygous low) resulting from known and theoretical mutations that are not included in this panel.

Sample Requirements

Specimen: Whole Blood

Container(s): Lavender/EDTA

Preferred Vol: 3 mL

Minimum Vol: 1 mL



Processing Instructions

Reject due to: Plasma or serum, heparinized

Spin: N

Aliquot: N

Temp: 2 - 8  C

Storage location: Do not spin. Refrigerate whole blood in CPA refrigerator send-outs rack.


Off-site collection: Do not spin. Refrigerate whole blood. Transport refrigerated.


Specimen Type Temperature Time
Whole blood Room temp 72 h
  Refrigerated 2 w
  Frozen 1 m



STAT Performed TAT
N Collected daily; Performed M, Th 6 - 10 d


Performing Laboratory

ARUP Laboratories

500 Chipeta Way
Salt Lake City, UT 84108-1221


Phone Number: (800) 522-2787


Department:  Send Outs


Phone Number: (206) 987-2563

Reference Range

Interpretive report provided.



Method: Polymerase Chain Reaction/Fluorescence Monitoring


Analytical Volume: None specified



Send Out Instructions


Reference Test Name: Thiopurine Methyltransferase (TPMT) Genotyping, 4 Variants
Reference Test Number: 2012233
Instructions: Send out M - F with ARUP courier.