Days Set Up
Monday - Friday
Analytic Time

5 days

Soft Order Code

Test Updated:


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.

Test Overview

Test Methodology
Test Usage
Reference Range

<0.2 nmol half cystine/ mg protein

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

Specimen Requirements


Collect Mon - Thurs before 4pm.

Collection Onsite

Collect specimen in ACD solution A tube. Send to Specimen Processing in a green bag, must be refrigerated within 1 hour of collection. Draw Mon- Thurs only before 4pm

Collection Offsite

Collect specimen in ACD solution A tube. Refrigerate within an hour of collection. Send to Specimen Processing refrigerated. Draw Mon- Thurs only before 4 pm

ACD Solution A
Normal Volume
5 mL Whole blood
Minimum Volume
2 mL whole blood

Billing Information

CPT Code
Pro Fee Code

Have More Questions?

Explore our helpful billing resources:

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.