US · guidance

CMS Pub. 100-03, ch. 1, § 20.17

Noninvasive Tests of Carotid Function

activein force · 2026-08-25 – presentas-observed

CIM 50-37

Noninvasive tests of carotid function aid physicians in studying and diagnosing carotid

disease. There are varieties of these tests which measure various anatomical and

physiological aspects of carotid function, including pressure (systolic, diastolic, and

pulse), flow, collateral circulation, and turbulence.

For operational purposes, it is useful to classify noninvasive tests of carotid function into

direct and indirect tests. The direct tests examine the anatomy and physiology of the

carotid artery, while the indirect tests examine hemodynamic changes in the distal beds of

the carotid artery (the orbital and cerebral circulations).

It is important to note that the names of these tests are not standardized. Following are

some of the acceptable tests, recognizing that this list is not inclusive and that local

medical consultants should make determinations:

Direct Tests

• Carotid Phonoangiography

• Direct Bruit Analysis

• Spectral Bruit Analysis

• Doppler Flow Velocity

• Ultrasound Imaging including Real Time

• B-Scan and Doppler Devices

Indirect Tests

• Periorbital Directional Doppler Ultrasonography

• Oculoplethysmography

• Ophthalmodynamometry

History

(Rev. 1, 10-03-03)

Provenance

Source: cms.gov
Retrieved: 2026-08-25
Edition: iom-2026-08-25
Content hash: c49f3d12caae525b4f056c11c78aeb4e9260f34a144983de8fab7d537b68cb80

View the official source →

The link goes to the issuing authority’s own document — the one we read to produce this record. Where a source publishes whole titles rather than sections, your browser may need a moment to jump to the provision.

Unofficial copy of government-published law, reproduced from official sources with full provenance. Not an official publication; verify against official sources before relying on it in a filing. Records in the 'guidance' corpus, and only that corpus, are sub-regulatory (interpretive guidelines, survey procedures) and are not binding law. Validity bounds follow each jurisdiction's declared temporalBasis.

Coverage · API docs