To validate a subluxation, you must document two of the PART components, and at least one of them must be ROM or asymmetry.

• A. Two of the four PART components, and at least one must be ROM or asymmetry
• B. Three of the four PART components
• C. Two of the four PART components, but ROM and asymmetry are not required
• D. All four PART components

Answer: (A)

In this question, the key idea is how to validate a subluxation using the PART criteria: Pain, Asymmetry, Range of motion (ROM), and Tissue changes. To validate, you need to document two of these four signs, and at least one of those two must be ROM or asymmetry. This requirement ensures there’s an objective, functional element (ROM or asymmetry) paired with another sign, making the documentation more reliable than relying on pain or tissue findings alone.

Why this is the best approach: ROM or asymmetry provides a measurable, observable indicator of dysfunction, which strengthens the case when paired with one other finding (such as pain or tissue changes). It keeps the standard focused on combining a functional/biomechanical sign with another criterion, rather than counting all signs or relying solely on subjective symptoms.

Why the other patterns don’t fit: documenting three or all four signs isn’t required by the rule and can be unnecessarily exhaustive. More importantly, simply documenting two signs that do not include ROM or asymmetry (for example, pain and tissue changes only) fails to meet the minimum requirement that at least one of the two must be ROM or asymmetry.