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Gestational Diabetes Screen

Source Blood
Mnemonic GESTSC
Specimen Requirements

Fasting status not required.

50 gram glucose drink to be administered to patient.
Blood sample is collected one hour later.

1 x 3 mL or 4.5 mL light green (mint) top PST tube.  Gold top SST tube also acceptable.

0.2 mL heparinized plasma or serum
Pediatric: 0.1 mL serum

 

Specimen Handling
Additional Information

Guidelines suggest testing between 24th and 28th week of gestation.

Please indicate number of weeks gestation on the requisition.

For Diabetes Clinical Practice Guidelines, please see: www.diabetes.ca/cpg2003. 

Testing Location Chemistry-ACH, DSC, FMC, PLC & RGH
Testing Frequency Daily
Alternate Name(s)  
Reference Interval <7.8 mmol/L at 1 hour after 50 g glucose load, between 24th and 28th week of pregnancy