GLUCOSE LEVEL

Test Code

LAB82

Quest Code

483

CPT Codes
82947

Preferred Specimen

1 mL serum

Patient Preparation
Fasting preferred. Fasting is defined as no consumption of food or beverage other than water for at least 8 hours before testing.

Minimum Volume

0.5 mL

Other Acceptable Specimens

Spun SST • Plasma from lithium heparin (green-top) tube in a plastic screw-cap vial • Plasma from sodium heparin (green-top) tube in a plastic screw-cap vial • Plasma from fluoride/oxalate (gray-top) tube in a plastic screw-cap vial

Instructions

Serum and plasma submissions must be separated from cells

Transport Container

Serum separator tube (SST)

Transport Temperature

Room temperature

Specimen Stability

Serum
Room temperature: 4 days
Refrigerated: 7 days
Frozen: 28 days

Whole blood (gray-top) tube
Room temperature: 24 hours
Refrigerated: 72 hours
Frozen: Unacceptable

Sodium fluoride plasma
Room temperature: 7 days
Refrigerated: 7 days
Frozen: 28 days

Heparinized plasma
Room temperature: 48 hours
Refrigerated: 7 days
Frozen: 28 days

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

Unspun serum or plasma separator tube (SST or PST) • Red-top or green-top tube (serum or heparinized plasma not separated from cells) • Anticoagulants other than lithium heparin, sodium heparin or fluoride/oxalate

Methodology
Spectrophotometry (SP)

Setup Schedule

Daily

Report Available

1 day

Limitations

Glucose levels may be depressed if sample is left to clot and not spun for an excessive length of time.

Reference Range

Fasting Reference Interval	65-99 mg/dL
Non-fasting Reference Interval	65-139 mg/dL

Clinical Significance

Serum glucose levels may be abnormally high (hyperglycemia) or abnormally low (hypoglycemia). Glucose measurements are used in the diagnosis and treatment of carbohydrate metabolic disorders including diabetes mellitus, idiopathic hypoglycemia, and pancreatic islet cell neoplasm.

Performing Laboratory

Quest Diagnostics-Lenexa

10101 Renner Blvd

Lenexa, KS 66219-9752

Last Updated: August 13, 2021

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.