Screening for Gestational Diabetes Mellitus (GDM)

Healthcare Provider Tool

What is the stage of pregnancy?

Early pregnancy / first antenatal visit
24 to 28 weeks

Does the patient have at least one risk factor for diabetes?^*

Yes No

^*Review Clinical Practice Guidelines' Chapter 4: Screening for Diabetes in Adults — Table 1: Risk factors for type 2 diabetes for more detailed information.

Enter the Fasting Plasma Glucose (FPG) and/or A1C test results:

FPG:	mmol/L		A1C:	%
Submit

Select the appropriate approach:

2 step approach (preferred)
1 step approach (alternative)

Enter the 1hr value test results from the 50g Oral Glucose Tolerance Test (OGTT):

mmol/LSubmit

Enter the test results from the Measure 75g Oral Glucose Tolerance Test (OGTT):

Fasting value:	mmol/L	1hr value:	mmol/L		2hr value:	mmol/L
Submit

Enter the test results from the Measure 75g Oral Glucose Tolerance Test (OGTT):

Fasting value:	mmol/L	1hr value:	mmol/L		2hr value:	mmol/L
Submit

Calculate Result

Screen for GDM at 24–28 weeks

Consider as pre-existing diabetes

Re-screen at 24–28 weeks

Normal

GDM

This is only to be used as a decision support tool and is subject to these terms.
For more information, please see terms of use.

*The Canadian Diabetes Association is the registered owner of the name Diabetes Canada. All content on guidelines.diabetes.ca, CPG Apps and in our online store remains exactly the same. For questions, contact communications@diabetes.ca.