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Glucose Tolerance Test
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Ordering Recommendation
Use to diagnose gestational diabetes mellitus, diabetes mellitus, or impaired glucose tolerance.
Mnemonic
Methodology
Quantitative Enzymatic Assay
Performed
Sun-Sat
Reported
Within 24 hours
New York DOH Approval Status
Specimen Required
Patient should fast for at least eight hours prior to collection of fasting specimen.
Collect 2 timed specimens (fasting and 120 minutes). Gray (sodium fluoride/potassium oxalate). Collect separate tube for each timed specimen.
Separate plasma from cells and refrigerate within 2 hours of collection. Transfer 1 mL plasma per time point to individual ARUP Standard Transport Tube. (Min: 0.2 mL/time point)
Refrigerated.
After separation from cells: Ambient: 24 hours; Refrigerated: 1 week; Frozen: 1 year
Reference Interval
Glucose (fasting and 120 min). Interpretation available on consultation with medical director.
Interpretive Data
Interpretive limits for glucose tolerance testing vary based on population, glucose dose, and time of collection after glucose administration. Published guidelines from the American Diabetes Association or the American Congress of Obstetricians and Gynecologists should be consulted for interpretive values.
FDA
Note
Administer 75 g glucola. Do not mix with water unless directions on product label indicate to do so. The patient should be fasting for at least eight hours prior to start of test, should remain inactive, and receive nothing by mouth (including tobacco) during test period. A small sip of water or ice is permissible. Reasons for invalid results include emesis and conditions which delay stomach emptying.
Hotline History
CPT Codes
82947; 82950
Components
| Component Test Code* | Component Chart Name | LOINC |
|---|
Aliases
- Blood Glucose
- Blood Sugar
- Fasting Blood Glucose
- Fasting Blood Sugar
- Fasting Plasma Glucose
- FBG
- FBS
- FPG
- GLU
- GTT
- OGTT
- Oral Glucose Tolerance Test
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