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Test Code LAB527 Insulin, Serum

Additional Codes

Mayo Test Code: INS

Reporting Name

Insulin, S

Useful For

Diagnosing insulinoma, when used in conjunction with proinsulin and C-peptide measurements


Management of diabetes mellitus

Method Name

Electrochemiluminescence Immunoassay

Performing Laboratory

Mayo Medical Laboratories in Rochester

Specimen Type


Specimen Required

Collection Container/Tube:

Preferred: Serum gel

Acceptable: Red top

Submission Container/Tube: Plastic vial

Specimen Volume: 1 mL

Collection Instructions:

1. Fasting

2. Avoid hemolysis

3. Label specimens with corresponding draw times.

4. Serum-gel tubes should be centrifuged within 2 hours of collection.

5. Red-top tubes should be centrifuged and aliquoted within 2 hours of collection.

Additional Information:

1. If multiple specimens are drawn, send separate order for each specimen.

2. 12 Hours before this blood test do not take multivitamins or dietary supplements containing biotin or vitamin B7, which are commonly found in hair, skin, and nail supplements and multivitamins.

Specimen Minimum Volume

0.5 mL

Specimen Stability Information

Specimen Type Temperature Time
Serum Frozen (preferred) 180 days
  Refrigerated  7 days

Reject Due To


Mild reject; Gross reject


Mild OK; Gross OK




Autopsy specimen

Reference Values

2.6-24.9 mcIU/mL

Day(s) and Time(s) Performed

Monday through Friday; 5 a.m.-12 a.m.

Saturday; 6 a.m.-6 p.m.

CPT Code Information


LOINC Code Information

Test ID Test Order Name Order LOINC Value
INS Insulin, S 20448-7


Result ID Test Result Name Result LOINC Value
INS Insulin, S 20448-7

Test Classification

This test has been cleared or approved by the U.S. Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.