Test Overview

Test Methodology


Reference Range*

Interpretive report provided

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

Test Details

Days Test Performed

Monday - Friday

Analytic Time

8 - 12 days

Soft Order Code


MiChart Code




Laboratory Reference

Mayo DMS2

Looking to Order a Test?

We’ve provided helpful links to make ordering easy.

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

Visit our provider FAQ and learn about common questions to ordering tests.

Specimen Requirements


Specimen should be collected prior to initiation of immunosuppressants.Test should not be requests in patients who have been given radioisotopes due to interference. No general or muscle relaxant drugs in the previous 24 hours.


Yellow Top Tube

Normal Volume

4 mL serum

Minimum Volume

2.5 mL serum

Additional Information

By ordering this test the clinician acknowledges that additional reflex testing will be performed and billed at a separate additional charge if indicated. Test performed by Mayo Clinic Laboratories.

Billing Information

Fee Codes

CPT Code

83519 x 3, 86255 x 16, 86341

Have More Billing Questions?

Explore our helpful billing resources:

Billing Resources

Billing FAQ