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Pathology Departments Requesting & Reporting Blood Test Information Phlebotomy Guide Contact us
Blood Sciences

Blood Test Information

TPMT (Thio Purine Methyl Transferase)
(a.k.a Azothioprine sensitivity)
minimum sample volume required ~ 4ml

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Test Code: TPM

Tube type: EDTA

Special instructions
An additional EDTA sample must be sent if FBC is also requested.

Reference ranges
Deficient: <10
Low: 20-67
Normal: 68-150
High: >150

Sent away to Birmingham City Hospital


Turnaround Time
21 days

Department: Biochemistry

Clinical Application
Identification of patients with low TPMT enzyme levels, which can lead to a risk of toxicity to thiopurine drugs.


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