GLUCOSE, FASTING

Test Code

GLUC

CPT Codes
82947

Preferred Specimen

1 Gold tube (gel separator)

Minimum Volume

0.5 mL serum or plasma

Other Acceptable Specimens

or 1 Lavender tube (EDTA)
or 1 Green tube (Lithium Heparin)
or 1 Gray tube (Sodium Fluoride)

Instructions

Separate from red cells ASAP to minimize loss of glucose through glycolysis. Refrigerate until tested.

Transport Temperature

Refrigerate

Specimen Stability

2-8°C up to 3 days
15-30°C up to 24 hours (plasma)
15-30°C up to 8 hours (serum)
Frozen samples are not recommended

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

Hemolyzed

Methodology

Hexokinase

Setup Schedule

M, T, W, Th, F, Sa, Sun

Reference Range

70 - 99 mg/dL

Clinical Significance

Used in the diagnosis and treatment of carbohydrate metabolism disorders including: diabetes mellitus, neonatal hypoglycemia, idiopathic hypoglycemia, and pancreatic islet cell carcinoma

Performed By
Alverno Laboratories

Performing Laboratory
Alverno Central Lab
NCHB1 (Chemistry, Beckman AU)

Additional Information
Fasting Patient Information Sheet

Last Updated: June 13, 2025

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.