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Thiopurine Metabolites

Ordering Info & Methodology

Test Code

Cerner Synonyms


Thiopurine Metabolites, 6-Mercaptopurine Metabolites; 6-MP Metabolites; 6-TGN; 6-MMPN

Turn Around Time


Test performed weekly

Ordering Guide

Specimen Requirements

Sample Type

Collection Container

Alternate Collection Containers

EDTA Whole Blood

Light Green

Dark Green

3 mL

3 days

Add on stability
This is the length of time after sample collection that this analyte is stable. Test can be added to a previously collected sample if the time since collection is less than the add on stability time.

Minimum Volume

Add On Stability

Collection and Shipping Requirements

Send whole blood at 2-8°C. Do NOT centrifuge or freeze. Frozen or hemolyzed samples will be rejected.

Reference Intervals

Female Reference Interval

Age Category
Reference Interval

Male Reference Interval

Age Category
Reference Interval
Additional Notes

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Measurement Uncertainty (MU)
Every laboratory value is an estimate of the true concentration of substance. MU is the 95% confidence interval around that estimate. 95% of the time, the true concentration will be within the range of the reported value ±MU. This value is based on analytical variability (precision) and does not reflect other factors such as sample collection and handling which may also affect the result.


Reported sodium = 140 mmol/L
Sodium MU = 1%
Expanded uncertainty = 140 mmol/L ± 1% or 140mmol/L ± 1.4 mmol/L
Interpretation - the true value of sodium in the sample is in the range 138.6-141.4 mmol/L, with 95% confidence.

Measurement Uncertainty

This test is for the metabolic breakdown products of the mercaptopurine drug. It is different from TPMT Enzyme/TPMT Genetics testing.

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