Free Insulin, MAYO: INSFT, EPIC: LAB6269, SOFT: XINS1
The patient should be fasting (8 hours) prior to specimen collection.
Specimen Collection Criteria
Collect (preferred specimen): One plain Red-top tube.
Also acceptable: One Gold-top SST tube.
Send specimen for processing immediately after collection.
Physician Office/Drawsite Specimen Preparation
Let specimen clot 30-60 minutes and centrifuge to separate serum from cells within 2 hours of collection. Transport serum to a plastic transport tube and freeze (-20°C/-4°F or below).
Preparation for Courier Transport
Transport: 1.0 mL serum, frozen (-20°C/-4°F or below). (Min: 0.5 mL)
- Hemolyzed specimens.
- Specimens not collected and processed as indicated.
Specimen Stability for Testing:
Room Temperature (20-26°C or 68-78.8°F): Unacceptable
Refrigerated (2-8°C or 36-46°F): 7 days
Frozen (-20°C/-4°F or below): 180 days
Specimen Storage in Department Prior to Disposal:
Specimen retention time is determined by the policy of the reference laboratory. Contact the Sendout Laboratory with any questions.
Sent to Mayo Medical Laboratories, Rochester, MN.
Monday - Saturday.
Results available in 2-4 days.
Free: 2.6-24.9 micro IU/mL
Total: 2.6-24.9 micro IU/mL.
Patients who have been injecting non human insulin for treatment of insulin-dependant diabetes may develop insulin autoantibodies. These antibodies bind directly to insulin making it unavailable for metabolic activity. Free insulin levels can be useful in management of diabetes mellitus patients with known insulin autoantibodies.
MAYO: INSFT, EPIC: LAB6269, SOFT: XINS1
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UroVysion® is a registered trademark of Abbott Laboratories. ThinPrep® is a registered trademark of Hologic, Incorporated.
This directory currently reflects information only for specimens collected and/or processed at the Farmington Hills,
Grosse Pointe, Royal Oak, and Troy campuses.