Having a Glucose Tolerance Test

Before Your Test
You need an appointment to have a glucose tolerance test. Please call the desired location to schedule an appointment.

Apex Healthplex (919) 350-4329
Brier Creek Healthplex (919) 350-9635 
Cary Hospital   (919) 350-2370
Garner Healthplex (919) 350-4230 
WakeMed North  (919) 350-1350
Raleigh Medical Park (919) 350-8238





Fast before your test.
Do not eat or drink anything for 12 hours prior to the test, and do not eat anything during the test. Consult your physician if you are taking any medication. Several drugs may cause glucose intolerance, including the following:
           • Thiazide diuretics (e.g., hydrochlorothiazide)
           • Beta-blockers (e.g., propranolol)
           • Oral contraceptives 
           • Corticosteroids (e.g., prednisone)
           • Some psychiatric medications 

Interfering factors:
Before having the glucose tolerance test, let your health care provider know if you are under an acute amount of stress (for example, from surgery or an infection), or if you have recently participated in vigorous exercise. These factors may interfere with your test outcome.     

What to bring
     • The filled out WakeMed Physician Order Form
     • Your insurance card and information
     • Any papers your doctor tells you to bring

When you arrive
When you arrive for your test, please report to Patient Registration first. At Patient Registration, you will be asked for information that is required for our records and for insurance billing purposes.

What is a Glucose Tolerance Test?
The glucose tolerance test measures the body's ability to metabolize glucose (sugar).

How is a Glucose Tolerance performed?
The most common glucose tolerance test is the oral glucose tolerance test (OGTT). After an overnight fast, blood is drawn from the patient.  The patient then drinks a solution containing a certain amount of glucose, and blood is drawn again every 60 minutes after the glucose is consumed for up to 3 hours. The duration of the test will depend upon the physician's orders. You will not be permitted to eat, drink or smoke for the duration of the test.  Please remain in the testing area for the entire test.

Will the test hurt?  
When the needle is inserted to draw blood, some people feel moderate pain, while others feel only a prick or stinging sensation. Afterward, there may be some throbbing.

When can I get my results?
The results of the test will be sent to the physician that requested the test. Your physician will discuss them with you. Laboratory employees are not permitted to release test results to patients.

WakeMed MyChart

Many lab results are available in our online patient portal.

Find a Lab

Apex Healthplex
120 Healthplex Way
Apex, NC 27502

7:30 am to 4:30 pm, Mon-Fri
No Weekend Hours

Get Directions
Apex Healthplex

Brier Creek Healthplex
8001 T.W. Alexander Road
Raleigh, NC 27617

7:30 am to 4:30 pm, Mon-Fri
No Weekend Hours

Get Directions
Brier Creek Healthplex

Cary Hospital
1900 Kildaire Farm Road
Cary, NC 27518

6 am to 6 pm, Mon-Fri
*Limited weekend hours: 9 am to 1 pm on Saturday; also open on holidays

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Cary Hospital

Garner Healthplex
400 US Hwy 70 E
Garner, NC 27529

7:30 am to 5:30 pm, Mon-Fri
No Weekend Hours

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Garner Healthplex

North Family Health & Women's Hospital
10000 Falls of Neuse Road
Raleigh, NC 27614

8 am to 4:30 pm, Mon-Fri
No Weekend Hours

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WakeMed North

Raleigh Medical Park         
23 Sunnybrook Road
Raleigh, NC 27610

7 am to 5 pm, Mon-Fri
No Weekend Hours

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Raleigh Medical Park

Note: Outpatient lab services are no longer offered on Raleigh Campus.