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If you have additional questions regarding this test, please call: 415-353-1667
1- hour 50 gram Glucose Loading Screen
|Performed by||Parnassus, Mission Bay & Mt. Zion Chemistry|
|In House Availability||Test available at ACC 0730-1530 weekdays.
Test available at 2230 Post St. 0800-1400 weekdays.
|Method||Oxygen consumption (O2 electrode with glucose oxidase)|
|Collection Instructions||Schedule in advance with ACC outpatient phlebotomy, x32736 or Post St. lab 415-885-7531 (Mt. Zion). This screening test may be given at any time of day, without regard to prior meals.|
|Container type||Gray top|
|Amount to Collect||1 mL blood Click here for Microdetermination info|
|Preferred volume||0.5 mL serum|
|Min. Volume||0.2 mL serum Click here for Microdetermination info|
|Normal range||1 hour post-50 g po glucose, without regard to whether patient had been fasting: 70 -139 mg/dL|
|Synonyms||Diabetes mellitus; GCT; Glucose challenge test|
|Stability||Room temperature 8 hours, refrigerated 2 days|
|Additional information||This 1 hour glucose loading screen is part of a two step screening approach previously used to screen pregnant patients for gestational
diabetes (GDM). When this step was abnormal, it was followed by the second step "3 hour 100 gram Glucose Tolerance Test, Pregnancy."
The two step screening approach has been generally replaced by the one step
approach to screening for GDM, see " 2 Hour, 75 gram Glucose Tolerance Test, Pregnant."
The 3 hour 100 gram Glucose Tolerance Test previously used in the two step approach will be discontinued, however, the "1 hour
50 gram Glucose loading screen" will remain orderable in the event that the clinician decides to request a "1 hour 50 gram Glucose loading
screen" in a patient who declines the one step approach involving the "2 Hour, 75 gram Glucose Tolerance Test, Pregnancy.
|Last Updated||5/12/2015 2:50:41 PM|
|Lab Procedure Link||Click here for Procedure|