Is Fasting Necessary Prior to Hormone Testing?

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Whether or not fasting is necessary prior to hormone testing depends on what hormones are being tested and what method of testing is used (i.e., blood, saliva, urine). Call your doctor if you are unsure about the fasting requirements for your hormone test. Most hormone tests do not require fasting.

Most hormone tests don't require fasting.
Most hormone tests don't require fasting. (Image: 4X-image/iStock/Getty Images)

Saliva Test

If using a saliva hormone test kit, you will need to fast overnight and apply the test before eating anything in the morning to avoid contamination of the saliva.

You will fast overnight if using a salica test.
You will fast overnight if using a salica test. (Image: Kevin Chesson/iStock/Getty Images)

Growth Hormone

Fasting is necessary prior to growth hormone testing. You will be asked to fast for 10 to 12 hours before testing.

Fasting is necessary prior to growth hormone testing.
Fasting is necessary prior to growth hormone testing. (Image: wavebreakmedia/iStock/Getty Images)

Sex Hormones

No fasting is required for hormone tests that test the levels of binding globulin, follicle stimulating or luteinizing hormone. You may be asked to fast prior to hormone testing for progesterone.

No fasting is required for hormone tests that test the levels of binding globulin, follicle stimulating or luteinizing hormone.
No fasting is required for hormone tests that test the levels of binding globulin, follicle stimulating or luteinizing hormone. (Image: Fuse/Fuse/Getty Images)

Thyroid Hormones

No fasting is required for hormone tests that check thyroid hormones, including the thyroid-stimulating hormone and parathyroid hormone.

Fasting isn't needed for hormone tests that check thyroid hormones.
Fasting isn't needed for hormone tests that check thyroid hormones. (Image: AlexRaths/iStock/Getty Images)

Cortisol

Hormone testing for cortisol may require a short fast, usually between two and three hours before testing. Adrenocortical hormone tests may require an overnight fast.

You may need to fast overnight when testing andrenocortical hormones.
You may need to fast overnight when testing andrenocortical hormones. (Image: Jacob Wackerhausen/iStock/Getty Images)

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