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Blood tests for acromegaly

Tests may be done to help measure the levels of growth hormone and insulin-like growth factor 1 (IGF-1) in your blood. These tests can be carried out without you having to stay overnight in the hospital, although if you live far from the hospital you may need to arrange to stay somewhere overnight.

The diagnosis of acromegaly requires higher than normal levels of both growth hormone and IGF-1 to be recorded.

Treating acromegaly

Read about acromegaly treatment options, including surgery, medication and radiotherapy, and the goals of therapy

Oral glucose tolerance test

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 doctor’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

IGF-1 measurement

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.

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Diagnosing acromegaly

Find out how acromegaly is diagnosed and the tests that healthcare professionals may use to monitor acromegaly symptoms caused by excess growth hormone in the body due to a pituitary tumour.

Find out more about acromegaly

Learn about acromegaly

Learn about acromegaly including what causes this slowly evolving condition and the early signs and symptoms

Treating acromegaly

Read about acromegaly treatment options, including surgery, medication and radiotherapy, and the goals of therapy

Acromegaly FAQs

Read answers to some common questions that patients with acromegaly have asked

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Please always consult a healthcare professional if you require healthcare advice or if you have any specific concerns regarding your acromegaly, its treatment or side effects. The information provided here is not intended to replace professional advice. This website has been developed by Ipsen in collaboration with those living with acromegaly and the healthcare professionals who care for them. Ipsen would like to thank everyone for their valuable insights and stories. All names used on this website are not necessarily real names. Visit for more information about us.

Consultez toujours un professionnel de la santé lorsque vous avez besoin de conseils en matière de soins de santé ou lorsque vous avez des préoccupations particulières concernant l’acromégalie, sa prise en charge ou ses effets secondaires. Les renseignements fournis ici ne doivent pas remplacer les conseils offerts par un professionnel. Ce site Web a été conçu par Ipsen en collaboration avec des personnes atteintes d’acromégalie et des professionnels de la santé qui s’occupent d’elles. Ipsen tient à remercier toutes les personnes qui ont participé à l’élaboration de ce site Web pour leurs précieux commentaires et leurs témoignages. Les noms utilisés sur ce site Web peuvent être fictifs. Pour en savoir plus à notre sujet, consultez le site

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