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Lab Manual for Moffitt-Long and Mount Zion

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Glucose Loading Screen

Item Value
Approval req'd? No
Available Stat? No
Test code GLT1
Test group Glucose
Performed by Parnassus & 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 , Gold top acceptable
Amount to Collect 1 mL blood Click here for Microdetermination info
Sample type Serum
Preferred volume 0.5 mL serum
Min. Volume 0.2 mL serum Click here for Microdetermination info
Units mg/dL
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 Used to screen pregnant females for impaired glucose tolerance by using a single 1 hour postprandial glucose level.

The American Diabetes Association, which previously recommended universal screening of pregnant women with this test, now recommends that screening be based upon risk factors, suggesting that it is not cost effective to screen women < 25 years old who are of normal body weight, have no personal or strong family history of diabetes nor glycosuria, have no history of poor obstetrical outcome, and are not members of ethnic or racial groups known to have high prevalence of diabetes mellitus (Diabetes Care 2004; 27:S5-S10).

Patients who have a positive screening test should be retested with the standard tolerance test for pregnancy (OGTP) employing a 100 g dose.

For dosing information, see entry for Glucose Tolerance Test.
LOINC code 1558-6
Last Updated 9/18/2012 2:34:30 PM
Entry Number 429
Lab Procedure Link Click here for Procedure

If you have additional questions regarding this test, please call: 415-353-1667

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