Patient Preparation: The patient is given a 50 gram dose of glucose and a single blood specimen is obtained one hour later. Fasting is not required.
Preferred Specimen(s): 1 mL plasma collected in a fluoride/EDTA Tube
Instructions: The patient is given a 50 gram dose of glucose and a single blood specimen is obtained one hour later. Fasting is not required. Note: The test should be performed between weeks 24 and 28 of gestation.
Transport Container Fluoride/EDTA Tube or plastic screw-cap vial
Transport Temperature
- Ambient 5 days,
- Refrigerated 14 days
Reject Criteria
- Gross hemolysis
- Anticoagulants other than fluoride/oxalate
- Serum
Methodology Hexokinase
Clinical Significance A value of 130 mg/dL or greater indicates the need for a full diagnostic, gestational glucose tolerance performed in the fasting state to determine if the patient has gestational diabetes.