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HelpEPIC CODE: LAB2491 Glucose Gestational Tolerance Test , 3-Hour
ADDITIONAL TEST CODE
Sunquest: GTGESC
REGIONAL HOSPITAL PERFORMING
UPH Methodist Hospital
UPH Pekin Hospital
UPH Proctor Hospital
Collect
Four timed samples: fasting; 60 min, 120 min, 180 min. post 100 gram glucose load:
Specimen of choice: gold, red or green (lithium heparin)
Clearly label each sample with actual collection time
Other Acceptable Specimen(s)
Gray top (sodium fuoride/potassium oxalate)
Storage/Transport Temperature
Serum or plasma (lithium heparin) at 2-8oC
If gray top collected: transport unspun ambient or2-8°C.
Stability (from collection to initiation)
After seperation from cells (within 2 hours of collection)
Serum or plasma (lithium heparin)
Ambient (room temperature): 8 hours
Refrigerated: 7 days; 72 hours
Frozen (-20o C) Stability: 1 year
Gray top:
Ambient: 24 hours
Refrigerated: 7 days
Frozen (-20o C) Stability: 1 year
Unacceptable Conditions
Reasons for invalid results include emesis & conditions which delay stomach emptying.
Remarks
Patient should be fasting for at least 8 hours prior to start of test. Oral administration of 100 gram glucose load after fasting specimen is drawn. Patient should remain inactive and receive nothing by mouth (including tobacco) during test period. A small sip of water or ice is permissible. Arrange in advance with Patient Scheduling.
Days Performed
Monday – Saturday
Methodology
Enzymatic (Hexokinase)
CPT Codes
82950
Notes
This test is a follow up for persons who have a fasting glucose between 100 and 125 ng/dL an elevated gestational screen or have other reasons to suspect diabetes mellitus.
Gestational Diabetes Mellitus is indicated if two or more of the following glucose levels are met or exceeded:
Fasting 95 mg/dL
One hour 180 mg/dL
Two hour 155 mg/dL
Three hour 140 mg/dL