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Glucose Tolerance Test, Gestational, 4 Specimens (100g) : 6745
Test CodeGTB3AU or 6745
CPT Codes
82951, 82952
Instructions
Patient Preparation:
Fasting required. Fasting is defined as no consumption of food or beverage other than water for at least 8 hours before testing.
Immediately after a fasting specimen is obtained, have patient ingest a 100 g load of glucose. Draw subsequent specimens 1, 2 and 3 hours later. Label e each with the specific draw time.
Serum and plasma submissions must be separated from cells.
Fasting required. Fasting is defined as no consumption of food or beverage other than water for at least 8 hours before testing.
Immediately after a fasting specimen is obtained, have patient ingest a 100 g load of glucose. Draw subsequent specimens 1, 2 and 3 hours later. Label e each with the specific draw time.
Serum and plasma submissions must be separated from cells.
Transport Container
Preferred Specimen
Four - 1 mL plasma specimens collected in fluoride/oxalate (gray-top) tubes
Alternative Specimens
Plasma from fluoride/oxalate (gray-top) tube in a plastic screw-cap vial, Serum (separated from cells immediately) in a plastic screw-cap vial, Spun SST, Plasma from lithium heparin (green-top) tube in a plastic screw-cap vial, Plasma from sodium heparin (green-top) tube in a plastic screw-cap vial
Minimum Volume
0.5 mL for each specimen
Four - 1 mL plasma specimens collected in fluoride/oxalate (gray-top) tubes
Alternative Specimens
Plasma from fluoride/oxalate (gray-top) tube in a plastic screw-cap vial, Serum (separated from cells immediately) in a plastic screw-cap vial, Spun SST, Plasma from lithium heparin (green-top) tube in a plastic screw-cap vial, Plasma from sodium heparin (green-top) tube in a plastic screw-cap vial
Minimum Volume
0.5 mL for each specimen
Transport Temperature
Room temperature.
Specimen Stability
Serum
Room temperature: 4 days
Refrigerated: 7 days
Frozen: 28 days
Whole blood (gray-top) tube
Room temperature: 24 hours
Refrigerated: 72 hours
Frozen: Unacceptable
Sodium fluoride plasma
Room temperature: 7 days
Refrigerated: 7 days
Frozen: 28 days
Heparinized plasma
Room temperature: 48 hours
Refrigerated: 7 days
Frozen: 28 days
Room temperature: 4 days
Refrigerated: 7 days
Frozen: 28 days
Whole blood (gray-top) tube
Room temperature: 24 hours
Refrigerated: 72 hours
Frozen: Unacceptable
Sodium fluoride plasma
Room temperature: 7 days
Refrigerated: 7 days
Frozen: 28 days
Heparinized plasma
Room temperature: 48 hours
Refrigerated: 7 days
Frozen: 28 days
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
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
Methodology
Spectrophotometry
Setup Schedule
Sunday - Saturday
Report Available
1 day
Reference Range
Glucose, Fasting 65-94 mg/dL
Glucose, 1-Hour <180 mg/dL
Glucose, 2-Hour <155 mg/dL
Glucose, 3-Hour <140 mg/dL
Clinical Significance
Plasma glucose levels may be abnormally high (hyperglycemia) or abnormally low (hypoglycemia). Glucose measurements are used in the diagnosis and treatment of carbohydrate metabolic disorders.
Performing Laboratory
med fusion
