Proinsulin Response to Glucose, 8 Specimens

Test Code

15856

Preferred Specimen

Red Top - To be drawn 30 minutes after glucose is given, then to follow: 60, 90, 120, 150, 180, 240, 300, NEW RED TOP MUST BE SUBMITTED FOR EACH TIME

Patient Preparation
Overnight fasting is required

Minimum Volume

can use TWO Red Microtainers, for EACH TIME

Instructions

For each timed specimen submitted, each tube must be clearly marked with time drawn. Submit all tubes with one test request form.
Draw baseline fasting specimen. Administer 75 grams oral Glucose. Glucose is not supplied by Quest Diagnostics, Incorporated, Nichols Institute.

Transport Temperature

Frozen

Specimen Stability

Room temperature: 24 hours
Refrigerated: 72 hours
Frozen: 90 days

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)

Received room temperature

Methodology
Immunoassay (IA)

FDA Status
This test was developed and its analytical performance characteristics have been determined by Quest Diagnostics. It has not been cleared or approved by the FDA. This assay has been validated pursuant to the CLIA regulations and is used for clinical purposes.

Setup Schedule

A.M. Sets up 2 days a week.

Reference Range

Fasting:	≤18.8	pmol/L
30 minutes post glucose:	≤32.9	pmol/L
60 minutes post glucose:	3.9-44.6	pmol/L
90 minutes post glucose:	≤44.5	pmol/L
120 minutes post glucose:	2.9-33.2	pmol/L
150 minutes post glucose:	≤31.8	pmol/L
180 minutes post glucose:	≤14.6	pmol/L
240 minutes post glucose:	≤12.3	pmol/L
300 minutes post glucose:	≤13.4	pmol/L

Clinical Significance

For diagnosis and monitoring therapy in patients with insulinomas.

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.