Glucose Tolerance Test, 3 hour (Gestational)

Important Note

*This test is orderable in Cerner as GTT OBS 3hr 100 gm

This is for followup after an abnormal GTT OBS 1 hr 50 gm during pregnancy.

Specimen Type: Blood
Container/Tube:

Preferred: Light-green top (lithium heparin gel)

Acceptable: Red top, serum gel

Specimen Volume: Full tube

Specimen Minimum Volume: 2 mL

Collection Instructions:

1. Draw a fasting specimen.

2. Give patient a 100 g dose of glucose beverage, noting time of ingestion (patient must drink entire beverage within 5 minutes).

3. Draw specimens at 1-, 2-, and 3-hours post ingestion of glucose beverage.

4. Label specimens with times of draw.

5. Send specimens in original tubes.

6. If there is a delay in transport of >1 hour, centrifuge tubes.

3 days Refrigerated

Fasting Glucose: 74-106 mg/dL

1, 2, 3 hour Glucose levels: 70-140 mg/dL

Siemens Dimension EXL

Colorimetric Absorbance

Daily / Same day / Available STAT

82951

82952