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GLUCOSE TOLERANCE, 3 HOUR GESTATIONAL
Test CodeGLUG3 (OE), GLUCG3 (LAB)
CPT Codes
82951, 82952
Includes
- Baseline (glucose) fasting
- 1 hour glucose (post 100g dose)
- 2 hour glucose (post 100g dose)
- 3 hour glucose (post 100g dose)
Preferred Specimen
Gold Tube (SST)
Patient Preparation
Patient must be fasting at least 8 hours prior to collection
A total of 4 specimens will be drawn.
- Draw fasting specimen
- Administer 100g oral glucose (Glucola) or dose specified by physician
- Draw specimen 1 hour after consumption of oral glucose (Glucola)
- Draw specimen 2 hours after consumption of oral glucose (Glucola)
- Draw specimen 3 hours after consumption of oral glucose (Glucola)
Minimum Volume
1 mL
Other Acceptable Specimens
Green Tube (Lithium Heparin)
Instructions
Centrifuge specimen immediately and separate serum or plasma from red cells to minimize the loss of glucose through glycolysis.
Transport Container
GOLD Tube
Transport Temperature
Room temperature
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)
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
- Collection time not labeled correctly on tube (s)
- Hemolyzed
Methodology
Hexokinase
Setup Schedule
DAILY, as received
Report Available
STAT: <60 minutes
Routine: <4 hours
Routine: <4 hours
Reference Range
- FASTING Male/Female All Ages: Normal Range: 65-94 mg/dL
- 1 HR GEST Male/Female All Ages: Normal Range: <180 mg/dL
- 2 HR GEST Male/Female All Ages: Normal Range: <155 mg/dL
- 3 HR GEST Male/Female All Ages: Normal Range: <140 mg/dL
Clinical Significance
Establish the diagnosis of diabetes mellitus in the pregnant patient. This test is the follow-up test in the two-step approach recommended by the American College of Obstetrics and Gynocology (ACOG).
Performing Laboratory
Mount Sinai Hospital
Holy Cross Hospital
