INSULIN, FREE AND TOTAL

Mnemonic

INSFT

Specimen Collection Requirements

Patient Preparation

Fasting specimen preferred. Reference intervals established for fasting specimens.

Collect

Serum, one 4.0 mL gold (SST) top tube, also acceptable: Plasma, one 4.0 mL lavender (EDTA) top tube

Handling

Separate serum from cells and transfer 2.0 mL serum to aliquot tube.

Frozen. Separate specimens must be submitted when multiple tests are ordered. 

Preferred Volume

2.0 mL

Minimum Volume

1.1 mL

Transport

Frozen

Rejection Criteria

Heparinized specimens, sodium fluoride/potassium oxalate plasma, hemolyzed specimens

Stability

AFTER SEPARATION FROM CELLS: Ambient: 8 hours; Refrigerated: 1 week; Frozen: 1 month

Testing Information

Performed

Mon, Wed-Sat

Reported

3-4 days

Method

Quantitative Ultrafiltration/Quantitative Chemiluminescent Immunoassay

Referral Lab

ARUP (70155)

Reference Values

Reference Values

Interpretation provided

CPT Codes

83525, 83527

Last Updated: Thursday, January 5, 2017 03:42:17 AM