A B C D E F G H I J K L M N O P Q R S T U V W X Y Z #

Insulin, Free (Bioactive) [36700]

Message
For Specimen Integrity during Extreme Weather see the “Lockbox Usage in Extreme Weather” document at the top of this page.


Test Code
INSFR


Alias/See Also
36700


CPT Codes
83527

Preferred Specimen
0.5 mL serum


Patient Preparation

Overnight fasting is required



Minimum Volume
0.3 mL


Other Acceptable Specimens
Plasma collected in: EDTA (lavender-top) tube


Transport Container
Plastic screw-cap vial


Transport Temperature
Refrigerated (cold packs) 


Specimen Stability
Room temperature: 12 hours
Refrigerated: 7 days
Frozen: 28 days


Methodology
Immunoassay (IA)

Setup Schedule
Set up: Sun, Tues, Thurs; Report available: 4-7 days


Reference Range
Insulin, Free1.5-14.9 uIU/mL
Insulin levels vary widely in specimens taken from non-fasting individuals.

Insulin analogues may demonstrate non-linear cross-reactivity in this assay. Interpret results accordingly.


Clinical Significance
The free insulin measurement is helpful in interpreting blood sugar concentration and its relationship to insulin injections in insulin-treated patients with insulin antibodies.


Performing Laboratory
Quest Diagnostics Nichols Institute-San Juan Capistrano, CA
33608 Ortega Highway
San Juan Capistrano, CA 92675-2042



Last Updated: November 30, 2021


The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.