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GESTATIONAL GLUCOSE TEST, 1HR
MessageChemistry
Test Code
LAB879
Alias/See Also
1-Hour Post Prandial
CPT Codes
82950
Includes
Glucose
Preferred Specimen
Light green top tube (lithium heparin plasma)
Minimum Volume
Whole blood: 600 uL (one full light-green-top microtainer or two full red-top microtainers).
Serum/plasma: 300 uL plasma.
Serum/plasma: 300 uL plasma.
Other Acceptable Specimens
Gold or Red Top Acceptable
Instructions
Order as a screening test for diabetes in pregnancy only. LAB: Patient need not be fasting No baseline specimen is required. Dose requirement is 50 gram Dextrose (Glucose). Centrifuge and analyze promptly. Dilute grossly lipemic specimens. Separate specimens within 30 minutes of collection.
Specimen Stability
Ambient: up to 24 hours.
Refrigerated: 7 days.
Frozen: 1 year.
Refrigerated: 7 days.
Frozen: 1 year.
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Hemolyzed, contaminated, not enough volume
FDA Status
Approved
Setup Schedule
Everyday
Report Available
Same day
Limitations
In fresh specimens, catalase released from the lysis of red blood cells causes a negative bias in glucose results. The degree of bias is proportional to the degree of hemolysis. In fresh samples, a negative bias of up to 10% may be observed with a level of hemolysis associated with a hemoglobin concentration of 250 mg/dL.
Reference Range
65 - 139 mg/dl Note: A glucose threshold value > 140 mg/dl identifies approximately 80% of women with gestational diabetes mellitus. The yield is increased to 90% by using a cutoff of > 130 mg/dl.
Performing Laboratory
Hoag Newport/ Hoag Irvine
