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Diagnosing the Mystery: Tests That Reveal Why You're Fainting
Published: Feb 21, 2024
If you've experienced fainting episodes, your doctor might recommend various tests to determine the cause. Understanding these tests can help you feel more prepared and less anxious about the diagnostic process.
The Initial Evaluation
Your doctor will start with a thorough medical history and physical examination. They'll ask about the circumstances of your fainting episodes, any warning signs you experienced, and your family history. A basic physical exam, including checking your blood pressure while lying down and standing up, can provide valuable clues about the cause of your fainting.
Heart Tests
Since many causes of fainting are related to heart problems, cardiac tests are often performed. These may include an electrocardiogram (ECG) to check your heart's electrical activity, and an echocardiogram to examine your heart's structure. In some cases, your doctor might recommend wearing a Holter monitor, a portable ECG device that records your heart's activity for 24-48 hours or longer.
Tilt Table Test
If your doctor suspects vasovagal syncope (the most common type of fainting), they might recommend a tilt table test. During this test, you lie on a table that tilts upright to simulate standing. Your heart rate and blood pressure are monitored to see if the change in position triggers symptoms. This test can help diagnose conditions that cause fainting when you change positions.
Blood Tests
Blood tests can help identify underlying conditions that might contribute to fainting. These might include tests for anemia, diabetes, or electrolyte imbalances. In some cases, your doctor might also check for cardiac enzymes to rule out a heart attack as a cause of your fainting episode.
Frequently Asked Questions
Most are painless, though blood tests involve a small prick.
It varies, from minutes for an ECG to days for some blood tests.
Most are covered, but check with your provider.
Follow your doctor's instructions, as some tests require fasting.
Knowledge is Power
Understanding the diagnostic process can help you take an active role in managing your health and finding the cause of your fainting episodes.
References
- Shen WK, et al. 2017 ACC/AHA/HRS Guideline for the Evaluation and Management of Patients With Syncope. J Am Coll Cardiol 2017.
- Brignole M, et al. 2018 ESC Guidelines for the diagnosis and management of syncope. Eur Heart J 2018; 39:1883.
This article has been reviewed for accuracy by one of the licensed medical doctors working for Doctronic. Always discuss health information with your healthcare provider.
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