Transcranial Doppler Ultrasound
Health Checkups
≈ ¥200-400
(≈ $30-60)
20 min
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Description
Estimated cost for Transcranial Doppler Ultrasound at general public hospitals in China is about ¥140-320, and at Grade 3A hospitals about ¥200-400, varying by hospital tier and region.
Main Uses
Transcranial Doppler (TCD) ultrasound is primarily used for: 1. Detecting and monitoring cerebrovascular diseases such as stroke, 2. Evaluating the presence and degree of carotid or vertebral artery stenosis, 3. Monitoring patients at risk for vasospasm following subarachnoid hemorrhage, 4. Assessing cerebral blood flow in various neurological conditions, 5. Guiding treatment decisions in acute ischemic stroke, including thrombolysis eligibility.
Normal Range
The normal range for Transcranial Doppler (TCD) ultrasound varies based on the specific blood vessel being examined. Commonly, the mean flow velocity in the middle cerebral artery (MCA) is considered normal between 40-100 cm/s, with a pulsatility index (PI) of 0.7-1.2. The values can slightly differ depending on the patient's age and the exact location of the measurement.
Low Values - Possible Causes
Low TCD values may be caused by: 1. Hypoperfusion due to systemic hypotension or shock, 2. Cerebral vasodilation, 3. Severe anemia, 4. Carotid artery stenosis or occlusion, 5. Post-stroke conditions affecting blood flow.
High Values - Possible Causes
High TCD values might result from: 1. Increased intracranial pressure, 2. Cerebral vasospasm, especially after subarachnoid hemorrhage, 3. Arteriovenous malformations (AVMs), 4. Hyperperfusion syndrome, 5. Migraine headaches during the aura phase.