FLACC Pain Scale (Face, Legs, Activity, Cry, Consolability)

Why use it

Pain assessment in non-verbal patients is a fundamental patient safety competency. The FLACC scale enables consistent, standardized pain measurement in patients who cannot verbally communicate pain intensity — including infants, toddlers, critically ill patients, cognitively impaired individuals, and post-anesthesia patients. It is widely endorsed by pediatric pain societies and incorporated into institutional pain protocols for non-verbal populations.

About

The FLACC (Face, Legs, Activity, Cry, Consolability) Scale is a validated behavioral pain assessment tool developed at the University of Michigan by Merkel and colleagues for measuring pain intensity in children ages 2 months to 7 years who are unable to verbally report pain. It has since been validated in cognitively impaired children and adults, sedated ICU patients, and post-operative patients across all ages. Each of the five behavioral categories (Face, Legs, Activity, Cry, Consolability) is scored 0–2 based on clinical observation, yielding a total score of 0–10. The FLACC demonstrates strong inter-rater reliability (ICC 0.94–0.97) and correlates well with self-reported pain scores in children capable of self-report. A Revised FLACC (r-FLACC) has been developed for children with cognitive impairment, allowing customization of behavioral descriptors.

When to use

• Pain assessment in infants and children ages 2 months to 7 years (primary indication)
• Post-operative pain monitoring in the PACU and pediatric units
• Critically ill pediatric patients in the PICU or NICU who cannot self-report
• Children or adults with cognitive impairment or developmental disability unable to self-report
• Sedated adult ICU patients when behavioral pain scales (BPS, CPOT) are not available
• Assessment of procedural pain in children (venipuncture, wound care, lumbar puncture)

Formula

Pearls & pitfalls

• The FLACC is an OBSERVATIONAL tool — it requires the clinician to observe the patient for at least 1–2 minutes in a consistent state before scoring.
• A FLACC score of 0 does NOT guarantee absence of pain — children may be exhausted from crying or pharmacologically sedated, producing falsely low scores.
• The Consolability item (C) is the only category that requires an active intervention — attempt to comfort the child before scoring this domain.
• Parental involvement significantly improves FLACC accuracy — parents can identify subtle behavioral pain cues that may be missed by unfamiliar clinicians.
• In cognitively impaired children, the Revised FLACC (r-FLACC) allows additional behavioral descriptors from parents to be added to each category.
• The FLACC correlates with Wong-Baker FACES (r=0.80) in children 3–7 years who can self-report — providing cross-validation in transitional age groups.
• FLACC ≥4 post-operatively in children should prompt analgesic administration rather than watchful waiting.
• Do NOT use the FLACC for neonates (<2 months) — use the Neonatal Pain, Agitation, and Sedation Scale (N-PASS) or CRIES scale for this population.
• Leg position (item L): evaluate spontaneous leg position at rest — if lower limbs are restrained post-operatively, score based on tension/rigidity felt during positioning.

Next steps

FLACC 0 (Relaxed/Comfortable): No intervention. Continue monitoring. FLACC 1–3 (Mild Discomfort): Non-pharmacological comfort measures (positioning, sucrose, distraction, parental presence). Reassess in 15–30 minutes. FLACC 4–6 (Moderate Pain): Non-pharmacological measures plus consider analgesic therapy (paracetamol, NSAIDs as appropriate for age). Reassess in 30 minutes. FLACC 7–10 (Severe Pain): Prompt pharmacological intervention required. Reassess in 15 minutes after intervention. Consider opioid analgesia if moderate analgesics insufficient. Involve analgesia service.

Evidence

Merkel SI et al. The FLACC: a behavioral scale for scoring postoperative pain in young children. Pediatr Nurs. 1997;23(3):293-297. PMID:9220806. Validation: Voepel-Lewis T et al. Reliability and validity of the face, legs, activity, cry, consolability behavioral tool in assessing acute pain in critically ill patients. Am J Crit Care. 2010;19(1):55-61. PMID:19455070. Inter-rater reliability ICC 0.94–0.97 across multiple studies.

References

1. Merkel SI et al. The FLACC: a behavioral scale for scoring postoperative pain in young children. Pediatr Nurs. 1997;23(3):293-297. — link
2. Voepel-Lewis T et al. Reliability and validity of the face, legs, activity, cry, consolability behavioral tool in assessing acute pain in critically ill patients. Am J Crit Care. 2010;19(1):55-61. — link
3. Malviya S et al. The revised FLACC observational pain tool: improved reliability and validity for pain assessment in children with cognitive impairment. Paediatr Anaesth. 2006;16(3):258-265. — link