Days Set Up
Monday, Wednesday, Friday
Analytic Time

8 hours

MiChart Code
Infusion, Saline 1000
Soft Order Code

Test Updated:


Immunoreactive Insulin

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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

Immunometric Chemiluminescence

Test Usage

Evaluate for insulin producing neoplasm (islet cell tumor, insulinoma) or pancreatic islet cell hyperplasia to work up hypoglycemia, possibly, to evaluate insulin production in diabetes mellitus.

Reference Range

Fasting level: 1 - 21 mcU/mL in conjunction with a normal serum glucose value. Insulin values obtained during a glucose tolerance test must be interpreted by a physician.

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

Specimen Requirements

Collection Offsite

Collect specimen in a green top tube from a fasting patient. Centrifuge, aliquot plasma into a plastic vial and freeze within 1 hour.

Yellow Top Tube
Normal Volume
1 mL plasma
Minimum Volume
0.5 mL plasma

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.