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Glucose, Gestational Screen (50g), 135 Cutoff : 8477
Test CodeGTB1AU or 8477
CPT Codes
82950
Instructions
Fasting is not required
The patient is given a 50 g dose of glucose and a single blood specimen is obtained one hour later.
Serum and plasma submissions must be separated from cells.
Note: The test should be performed between weeks 24 and 28 of gestation.
The patient is given a 50 g dose of glucose and a single blood specimen is obtained one hour later.
Serum and plasma submissions must be separated from cells.
Note: The test should be performed between weeks 24 and 28 of gestation.
Transport Container
Preferred Specimen
1 mL plasma collected in a fluoride/oxalate (gray-top) tube
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
1 mL plasma collected in a fluoride/oxalate (gray-top) tube
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
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
<135 mg/dL
Clinical Significance
A value of 135 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.
Performing Laboratory
med fusion
