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Rheoencephalography (REG)
rheoencephalography · REG test · cerebral blood flow test
A nurse puts sensors on your head and records a weak current through the tissues. This test is still used in some countries. From the recording, the doctor judges blood filling in the head's vessels.
Sometimes ordered for headaches, dizziness, or blood pressure swings. Today a vessel ultrasound is more common. Your doctor will decide what you need.
⏱ Duration: usually 15 to 20 minutes; the report is usually ready the same day
Be sure to tell your doctor
How to prepare
- Morning. On the test day, no coffee, strong tea, or smoking. They affect blood vessels.
- Food. You can usually eat, but not a big meal. Check with the clinic.
- Hair. Clean, with no styling products or hairspray.
What to bring
- Your referral
- Past blood vessel tests
- A list of your medicines
How it goes
- You sit or lie down and rest for a few minutes
- Electrodes on an elastic band are put on your head
- A recording is made at rest. You need to sit quietly
- Sometimes you are asked to turn or tilt your head
- Sometimes a medicine is given under the tongue and another recording is made, only if your doctor decides
What you'll feel
- It does not hurt. The current is weak and you cannot feel it
- The band may press a little
Afterwards
- You can go back to your usual day right away
- The report is usually ready the same day
- Go over the results with a neurologist
Common questions
Which is better, REG or a vessel ultrasound?
Today a head and neck vessel ultrasound is ordered more often. It shows more. Ask your doctor what suits you.
Is it safe?
Yes. The current is very weak, and you cannot feel it.