Glucose Tolerance Test, Gestational, 3 Specimens (75g)
Quest Diagnostics
Sample type: Plasma
Requires fasting: Yes
Phlebotomy required
Details
This test measures plasma glucose levels to help diagnose and manage carbohydrate metabolic disorders. It's particularly useful for identifying conditions of abnormally high (hyperglycemia) or low (hypoglycemia) blood sugar levels.
- Glucose, 1-hour (post 75 g glucose PO)
- Glucose, 2-hour (post 75 g glucose PO)
- Glucose, Fasting
Estimated days for results: Results should be available in 2 - 5 business days after the sample is collected
Details
Glucose Tolerance Test, Gestational, 3 Specimens (75g) - This test measures plasma glucose levels to help diagnose and manage carbohydrate metabolic disorders. It's particularly useful for identifying conditions of abnormally high (hyperglycemia) or low (hypoglycemia) blood sugar levels.
What patients is this test right for?
This test is crucial for pregnant women to screen for gestational diabetes, a condition that can affect both mother and baby's health.
What type of sample is required for this test?
Three - 1 mL plasma specimens are needed for this test. They should be collected in fluoride/oxalate (gray-top) tubes.
Test Resources
Not available.
2–5 business days
Glucose, Fasting 65-91 mg/dL
Glucose, 1-Hour <180 mg/dL
Glucose, 2-Hour <153 mg/dL
ADA/IADPSG Guidelines: One or more values greater than the above reference intervals are diagnostic of gestational diabetes. Fasting plasma glucose ≥126 mg/dL indicates overt diabetes in pregnancy.
Glucose, 1-Hour <180 mg/dL
Glucose, 2-Hour <153 mg/dL
ADA/IADPSG Guidelines: One or more values greater than the above reference intervals are diagnostic of gestational diabetes. Fasting plasma glucose ≥126 mg/dL indicates overt diabetes in pregnancy.
Fasting for 8 hours before your blood draw is required.
- Fasting before a blood draw means you don't eat or drink anything except water.
- Your doctor should provide any special instructions related to fasting for your test. Always follow your doctor's instructions.
Blood Draw Options with Fullscript
Fullscript offers several convenient phlebotomy options to complete your lab testing:
Quest Diagnostics Patient Service Centers (PSC)
- Location: Visit a nearby Quest Diagnostics Patient Service Center.
- Cost: $10 sample collection fee (paid during lab order checkout).
- Scheduling: Schedule your appointment here. Appointments are recommended to reduce wait times. Walk-ins are accepted, but may experience delays. Aim to arrive 10 minutes before your appointment.
- Collection Instructions:
- Bring a valid ID.
- Bring your digital or printed requisition form, available in the Labs tab of your Fullscript account.
- Check-in: Scan the QR code from your confirmation email or follow kiosk instructions.
- More Info: Quest Diagnostics blood draw guide
Getlabs Mobile Phlebotomy
- Location: Sample collection at your home or office.
- Cost: $85 sample collection fee (paid during lab order checkout).
- Availability: Available in most locations – enter your ZIP code during checkout to confirm.
- Scheduling: Schedule your appointment here through your Fullscript account.
- Collection Instructions:
- Have your digital or printed requisition form and valid ID ready.
- Your phlebotomist will contact you by phone to coordinate arrival.
- More Info: Getlabs blood draw guide
Specimen
- Preferred Specimen(s): Three - 1 mL plasma specimens collected in fluoride/oxalate (gray-top) tubes
- Alternative: NA
- Minimum Volume: 0.5 mL
- Collection Instructions: NA
Storage and shipping instructions
- Transport Container: Fluoride/oxalate (gray-top) tube
- Transport Temperature: Room Temperature
- Specimen Stability:
- Room temperature: 7 days
- Refrigerated: 7 days
- Frozen: 28 days
- Reject Criteria:
- 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
State restrictions:
Patient can't order this test if they are located in Hawaii, Puerto Rico, New Jersey, New York, or Rhode Island
