“I had blood tests and my insulin-like growth factor level was very high”
Actual patient. Patient was compensated for their appearance.
This patient testimonial reflects only this person’s opinions about their own care. Each person’s case is unique and you should always consult a doctor for information and advice about the diagnosis and treatment of acromegaly.
Please note that the tests used to diagnose acromegaly may vary according to your particular situation and to local healthcare practices.
For the oral glucose tolerance test, or OGTT, you won’t be able to eat or drink anything for about 8 hours before the test.
When you arrive at your healthcare professional’s office or the lab, a healthcare professional will take a sample of your blood. You will then be given a glucose (“sugary”) drink.
After 2 hours, a healthcare professional will take another sample of your blood. After this, you will be able to have something to eat and go home.
If you have acromegaly, your growth hormone levels will remain high throughout the test. This will happen even after a glucose drink, which would normally result in the growth hormone levels decreasing to very low levels.
The three main elements of the oral glucose tolerance test
Some of the blood you provide for the growth hormone test will be sent to a laboratory to measure your levels of IGF-1.
IGF-1 is a naturally occurring hormone produced by the liver that mediates nearly all of the actions of growth hormone on the tissues of the body.
Looking at how levels of your growth hormone change throughout the day is a test that some hospitals may use to monitor the effectiveness of treatment for acromegaly.
This test also involves fasting from about 10 pm the evening before an early morning appointment at the hospital.
To perform this test, a needle is placed in your arm and blood will be taken at intervals over several hours.
After the first sample is taken, you can have breakfast and you will be able to move about freely.
Timing varies. Please consult your healthcare professional for details.
Learn about acromegaly including what causes this slowly evolving condition, and the early signs and symptomsLearn about acromegaly
Read and hear answers to some common questions that patients with acromegaly have askedView FAQs
Information about the emotional, physical and social challenge of living with acromegalyLiving with acromegaly