Comparison of the Psychometric Properties of the FLACC Scale, the MBPS and the Observer Applied Visual Analogue Scale Used to Assess Procedural Pain.

The reliability and sensitivity of the FLACC and MBPS were supported by study data but concerns about the capacity of these scales to distinguish between pain- and non-pain-related distress were raised. The VASobs cannot be recommended. Despite its limitations, the FLACC scale may be better suited than other scales for procedural pain measurement.