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Glucose Tolerance, 1 Hour Challenge (Pregnant)
MessagePerforming Lab: Central Lab, Hudson, Lakeview, Regions, Sartell, Westfields
Test Code
0118
Alias/See Also
Sunquest: GL1
CPT Codes
82950
Includes
Grams of Glucose (GMS); 1 Hour Glucose (GLU1)
Preferred Specimen
0.2 mL Lithium Heparin Plasma (light green-top) tube
Minimum Volume
0.1 mL
Other Acceptable Specimens
Serum (gold-top, red-top, red/gray-top), Lithium Heparin (light green-top) on ICE
Instructions
Ordering:
The 1 hour Glucose Challenge Test is a screening test intended only for OB patients. No fasting glucose is required.
The following information is required when ordering: GMS (Grams): Default is 50 grams. Enter number of grams if other than 50
Collection:
Instruct the patient to drink 50 grams (5 ounces) of Glucola within 5 minutes. Collect a glucose 1 hour after the patient has begun ingesting the Glucola. If vomiting occurs, test should be credited as VOMIT.
Processing:
Centrifuge plasma separator tubes within 30 minutes of collection (to avoid metabolism of glucose by cells).
The 1 hour Glucose Challenge Test is a screening test intended only for OB patients. No fasting glucose is required.
The following information is required when ordering: GMS (Grams): Default is 50 grams. Enter number of grams if other than 50
Collection:
Instruct the patient to drink 50 grams (5 ounces) of Glucola within 5 minutes. Collect a glucose 1 hour after the patient has begun ingesting the Glucola. If vomiting occurs, test should be credited as VOMIT.
Processing:
Centrifuge plasma separator tubes within 30 minutes of collection (to avoid metabolism of glucose by cells).
Transport Temperature
Refrigerated
Specimen Stability
Room Temperature: 24 hours
Refrigerated: 7 days
Frozen: 1 year
Refrigerated: 7 days
Frozen: 1 year
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Samples not removed from cellular material within 30 minutes, hemolysis
Methodology
Colorimetric
Setup Schedule
Hospital: Daily
Clinics: Monday - Friday
Clinics: Monday - Friday
Report Available
Same day
Limitations
Glucose Challenge test is used for screening only during pregnancy
Reference Range
70 - 135 mg/dL
Critical Low: <= 50 mg/dL
Critical High: >= 450mg/dL
Critical Low: <= 50 mg/dL
Critical High: >= 450mg/dL
Clinical Significance
During pregnancy, about 4% of women with no prior history of diabetes will develop gestational diabetes. Although it can occur at any time, most cases will develop during the later part of the pregnancy. If increased blood sugar levels in the pregnant woman are uncontrolled, they can cause the fetus to increase in size and weight. They can also cause the baby to be born with very low glucose levels and to have breathing difficulties. Most women are checked for gestational diabetes between 24 and 28 weeks of pregnancy. For those with gestational diabetes, diet control and/or insulin injections throughout the rest of the pregnancy may be required to bring glucose levels down to normal levels. In most cases, gestational diabetes will go away after delivery, but women who have gestational diabetes will be at an increased risk of having it again with subsequent pregnancies and of developing type 2 diabetes in the future.
