Proinsulin

Test Codes

EPIC: LAB1232055, Beaker: Proinsulin, Quest: 760

Department

Send Outs

Instructions

The patient must be fasting overnight prior to specimen collection.

Specimen Collection Criteria

Collect: One gold-top SST tube (SST).

Also Acceptable: One plain Red-top tube.

Physician Office/Draw Specimen Preparation

Centrifuge to separate serum from cells. Transfer serum to plastic transport tube and freeze (-20°C/-4°F or below) prior to transport.

Preparation for Courier Transport

Transport: 1.0 mL serum, frozen (-20°C/-4°F or below). (Minimum: 0.5 mL)

Rejection Criteria

• Grossly hemolyzed specimens.
• Grossly lipemic.
• Received room temperature.
• Specimens not collected and processed as indicated.

In-Lab Processing

Centrifuge to separate serum from cells. Transfer serum to plastic transport tube and freeze (-20°C/-4°F or below) prior to transport.

Transport: 1.0 mL serum, frozen (-20°C/-4°F or below). (Minimum: 0.5 mL)

Storage

Specimen Stability for Testing:

Room Temperature (20-26°C or 68-78.8°F): 24 hours
Refrigerated (2-8°C or 36-46°F): 72 hours
Frozen (-20°C/-4°F or below): 90 days

Specimen Storage in Department Prior to Disposal:

Specimen retention time is determined by the policy of the reference laboratory. Contact the Send Outs Laboratory with any questions.

Laboratory

Sent to Quest Diagnostics, Wood Dale, IL.

Performed

Monday, Friday.
Results available in 6-9 days.

Reference Range

≤18.8 pmol/L

Test Methodology

Enzyme Linked Immunosorbent Assay (ELISA)

Interpretation

By report.

Clinical Utility

Proinsulin is used to diagnose insulinomas and to monitor therapy in patients with insulinomas.

CPT Codes

84206

Contacts

Last Updated

12/17/2025