Specimen Collection Manual and Test Catalog
INSULIN, FREE (BIOACTIVE)
Geisinger Epic Procedure Code: LAB2541 Geisinger Epic ID: 21471SPECIMEN COLLECTION
Specimen type:
Serum (preferred) or plasma.
Preferred collection container:
Alternate collection container:
3 mL lavender-top (K2 EDTA) tube
3.5 mL gold-top (serum separator) tube
Specimen required:
0.5 mL aliquot serum or plasma; minimum 0.3 mL
Patient preparation:
Overnight fasting is required.
SPECIMEN PROCESSING
Processing instructions:
Centrifuge and transfer specimens to clean, plastic, screw-capped vial(s). Transport frozen.
Transport temperature:
Refrigerated (preferred) or frozen.
Specimen stability:
Room Temperature: 12 hours (unacceptable). Refrigerated: 7 days. Frozen: 28 days.
Rejection criteria:
Stability limits exceeded. Room temperature specimen.
TEST DETAILS
Reference interval:
CPT code(s):
83527 1.5-14.9 uIU/mL
Note: The billing party has sole responsibility for CPT coding. Any
questions regarding coding should be directed to the payer being billed.
The CPT codes provided by GML are based on AMA guidelines and are for informational purposes only.
The CPT codes provided by GML are based on AMA guidelines and are for informational purposes only.
Test includes:
Free insulin.
Methodology:
Immunoassay
Synonyms:
FREINS, Free insulin, Insulin (bioactive), Quest test code 36700
Clinical significance:
Review Date:
11/14/2024 The free insulin measurement is helpful in interpreting blood sugar concentration and its relationship to insulin injections in insulin-treated patients with insulin antibodies.
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