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Contents
  • Before the Test
  • The Night of the Test
  • What to Expect After

Step-by-Step Guide: Preparing for a Dexamethasone Suppression Test

Step-by-Step Guide: Preparing for a Dexamethasone Suppression Test

What's Involved?

Preparing for a dexamethasone suppression test (DST) is key for accurate results. This guide walks you through the steps to ensure you're ready for the test.
Contents
  • Before the Test
  • The Night of the Test
  • What to Expect After

Before the Test

Consult your doctor about any medications you're taking, as some can affect the test results. Avoid alcohol and caffeine, as they may interfere with cortisol levels. Ensure you get a good night's sleep before the test for the most accurate results.

The Night of the Test

You'll take a dose of dexamethasone, usually 1 mg, around 11 PM. Make sure to follow the dosing instructions carefully. This is crucial because the timing and dosage affect how well the test can measure cortisol suppression.
A detailed guide on how to prepare for a dexamethasone suppression test to ensure accurate results.

What to Expect After

The morning after taking dexamethasone, you'll have a blood sample taken, typically around 8 AM. This sample will be used to measure cortisol levels and determine how well your body suppressed cortisol production. Results will guide further diagnostic steps if needed.

FAQs

What is a DST?

It's a test to measure cortisol levels after taking dexamethasone.

How should I prepare?

Avoid certain meds, alcohol, caffeine, and ensure adequate sleep.

When is the test done?

The test usually involves taking dexamethasone at night and a blood test in the morning.

Why is timing important?

Proper timing ensures accurate cortisol suppression measurement.

Next Steps

Proper preparation for a DST can lead to accurate and useful results in diagnosing cortisol imbalances.
Discuss with Doctronic how to prepare and what to expect from your DST.
Additional References
  1. Cronin C, Igoe D, Duffy MJ, et al. The overnight dexamethasone test is a worthwhile screening procedure. Clin Endocrinol (Oxf) 1990; 33:27.
  2. Findling JW, Raff H. Recognition of Nonneoplastic Hypercortisolism in the Evaluation of Patients With Cushing Syndrome. J Endocr Soc 2023; 7:bvad087.
This article has been reviewed for accuracy by one of the licensed medical doctors working for Doctronic.