GTT 3 Hour (100 gram dose for pregnancy)
Label Mnemonic: | GT3OB |
Epic code: | LAB8763 |
Supply order: | Supply Order Form |
Billing: | Billing Policies |
CPT code: | 82951 for the first 3 specimens and 82952 for each additional specimen |
Specimen(s):
Plasma
Collection Medium:
or | ||
Gray top tube 6 mL (Na Fluoride) | Plasma Separator Tube 4.5 mL (Centrifuge Immediately) |
Minimum:
3 mL plasma in gray top tube
Testing
Schedule:
24 hrs/day, 7 days a week, including holidays.
Turn Around
Time:
1 hour (upon receipt in laboratory)
Reference Range:
Glucose, Fasting (100 gram dose for pregnancy) < 95 GTT 1 hour (100 gram dose for pregnancy) < 180 GTT 2 hour (100 gram dose for pregnancy) < 155 GTT 3 hour (100 gram for pregnancy) < 140 GTT 1 Hour, Non-fasting (50 gram dose for pregnancy) < 140 Reference range based on: ACOG Practice Bulletin. Clinical Management Guidelines for Obstetricians-Gynecologists. Gestational Diabetes Mellitus. Number 190, February 2018.
Comments:
Collect all specimens in gray top tube on patient care area and
hold (sodium fluoride anticoagulant). Deliver all specimens
simultaneously. Microtube specimens must be scheduled with the lab in
advance and delivered immediately after drawing.
Test
Limitations:
Icterus: No significant interference up to an I index of 60
(approximate conjugated and unconjugated bilirubin concentration:
60 mg/dL).
Hemolysis: No significant interference up to an H index of 1000 (approximate hemoglobin concentration 1000 mg/dL).
Lipemia (Intralipid): No significant interference up to an L index of 1000 (approximate triglycerides concentration 2000 mg/dL). There is poor correlation between turbidity and triglycerides concentration.
Hemolysis: No significant interference up to an H index of 1000 (approximate hemoglobin concentration 1000 mg/dL).
Lipemia (Intralipid): No significant interference up to an L index of 1000 (approximate triglycerides concentration 2000 mg/dL). There is poor correlation between turbidity and triglycerides concentration.
Methodology:
Hexokinase/UV Test
Instructions:
Gray top (Na Fluoride) collections: Transport whole blood to the laboratory within 24 hours.
Sample
Processing:
Centrifuge at a speed and time necessary to get barrier separation of plasma/serum and cells within 1 hour of collection.
Separate plasma or serum into labeled container and cap.
Label transport tube with two patient identifiers, date and time of collection.
Separate plasma or serum into labeled container and cap.
Label transport tube with two patient identifiers, date and time of collection.
Sample
Storage:
Refrigerate.
Transport
Instructions:
Place labeled specimen into zip-lock type biohazard bag; seal bag.
Place completed requisition into outside pocket of bag.
Transport in cooler with refrigerated coolant packs.
Place completed requisition into outside pocket of bag.
Transport in cooler with refrigerated coolant packs.
CPT Code:
82951 for the first 3 specimens and 82952 for each additional specimen