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Preparing for “The Glucose Test”

In pregnancy, your placenta produces hormones that make your body less sensitive to insulin, which makes you more likely to have diabetes than non-pregnant people.  Diabetes that happens in pregnancy is called “gestational diabetes.” The screening test for gestational diabetes is called a glucose challenge test (GCT), and we typically do this in our office between 26-28 weeks of your pregnancy. 

How does the test work?

This point of the test is to challenge your body’s ability to produce insulin when you consume glucose. You’ll drink a sugary drink called Glucola, which contains 50 grams of glucose. An hour later, after your body has had some time to produce insulin to counteract the sugar, we’ll draw your blood.  Because this is just a screening test, if your results come back high, you’ll need to do a more in depth 3-hr version of the test to then determine if you have gestational diabetes.

1 month prior 

  • Pick up the Glucola when you’re in the office, one or two visits before your planned GCT.
  • Make sure that you schedule your GCT visit as an in-person visit at our office.

A few days prior

  • It’s a good idea to avoid carb-heavy meals like cereal or pasta, sugary treats, and especially avoid sugary drinks such as juice or soda. Drink lots of water, and focus on protein, healthy fat, and vegetables. 
  • Get plenty of exercise, even if it’s a 30 min walk per day.
  • Put your Glucola in the fridge. It just tastes better this way.

The morning of

  • Plan to “fast” for the two hours before you drink the Glucola. This means nothing to eat or drink (other than small sips of water) for two hours. 
  • You can plan to have breakfast or lunch before you start your two hour fast, as long it is low in carbohydrates. Instead of cereal or toast, focus on protein like eggs or meat, and healthy fats like avocado.  

40 minutes before your appointment time

  • Drink the glucola, in under 5 minutes.
  • Once finished, note the time, and set a timer for one hour.
  • Head to the Oula office.
  • When your timer goes off, we’ll draw your blood.