When BP is measured from a site other than the fistula arm due to an AV fistula, what should be documented?

• A. The time of day.
• B. The identity of the clinician.
• C. The limitation of using the alternate site.
• D. The arm circumference.

Answer: (C)

When a BP is taken from a site other than the fistula arm, you need to document the limitation of using that alternate site. The AV fistula alters blood flow and arterial properties in its arm, so measurements taken on the opposite arm may not reflect the patient’s true systemic BP with the same accuracy. Recording this limitation communicates that the reading could be less reliable and may affect interpretation or decisions, and it helps guide any necessary rechecks or alternative approaches. Time of day, who performed the measurement, or arm circumference are not the primary factor here; the key point is that using an alternate site carries a limitation in accuracy that should be noted.