Cleveland HeartLab G, Metabolic, Test

CPT Code: 82947
Order Code: C101
ABN Requirement:  No
Synonyms: Blood Sugar; Fasting Blood Sugar; FBS; Fasting Blood Glucose; FBG; Blood Glucose
Specimen: Serum
Volume: 0.5 mL
Minimum Volume: 0.2 mL
Container: Gel-barrier tube (SST, Tiger Top)


  1. Collect and label sample according to standard protocols.
  2. Gently invert tube 5 times immediately after draw. DO NOT SHAKE.
  3. Allow blood to clot 30 minutes.
  4. Centrifuge for 10 minutes.

Patient Preparation: Patient should be fasting for 12 hours prior to being drawn.

Special Instructions: Blood must be centrifuged within 30 minutes of collection.

Transport: Store serum at 2°C to 8°C after collection and ship the same day per packaging instructions provided with the Cleveland HeartLab shipping box.


Ambient (15-25°C): 8 hours
Refrigerated (2-8°C): 7 days
Frozen (-20°C): 2 weeks
Deep Frozen (-70°C): not acceptable

Causes for Rejection: Specimens other than serum; improper labeling; samples not stored properly; samples older than stability limits; hemolyzed specimens

Methodology: Enzymatic Assay

Turn Around Time: 1 to 3 days

Reference Range:

Age mg/dL
All Ages 65-99

Critical Value:

Age Critical Low, mg/dL Critical High, mg/dL
All Ages ≤40 ≥500

Urgent Values:

Age Urgent Value mg/dL
All Ages 400-499

Intended Use: A glucose test can be used to identify diabetic and pre-diabetic individuals among a healthy, asymptomatic population, especially those with risk factors such as obesity or age >40 years. The glucose test can also be used to detect both hyperglycemia and hypoglycemia, and to monitor glucose levels in persons with diabetes.

Limitations: In very rare cases, gammopathy, in particular type IgM (Wandenstrom’s macroglobulinemia), may cause unreliable results.

Additional Information: When un-separated, whole blood specimens are permitted to stand uncentrifuged, the glucose value decreases ~7% per hour (5-10 mg/dL) due to glycolysis. Stability of glucose values are also affected by storage temperature and bacterial contamination.

The CPT codes provided 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 payer being billed.