Days Set Up
Analytic Time

8 hours

MiChart Code
Tacrolimus Level, Random
Soft Order Code

Test Updated:



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Find a Requisition

All specimens should be accompanied by a requisition.

Submitting Specimens

Learn about how to properly label and where to ship specimens.

Order Kits and Supplies

MLabs provides all the supplies necessary for the collection of specimens.

Test FAQ

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Test Overview

Test Methodology

Liquid Chromatography/Mass Spectrometry (LC/MS)

Test Usage

To monitor tacrolimus levels in blood to prevent toxicity and maintain proper therapeutic dosage.

Reference Range

5.0 - 20.0 ng/mL

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Specimen Requirements

Collection Offsite

Collect a trough specimen (draw immediately prior to next dose) in a lavender top tube. Mix collection tube gently by inversion to prevent clotting. Send intact specimen; do NOT centrifuge. Refrigerate.

Lavender Top Tube
Normal Volume
2 mL whole blood
Minimum Volume
2 mL whole blood

Billing Information

CPT Code
Pro Fee Code

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Our High Standard

Quality that sets us apart

As the reference laboratory division of Michigan Medicine's Department of Pathology, MLabs shares the institution's commitment to applying established quality principles to clinical laboratory testing. Like other large organizations in complex, consequential fields, we rely on an established approach to monitor quality throughout the testing process.