What it is
The Behavioural Observational Pain Scale (BOPS) is a short observational pain tool for children who cannot reliably self-report — developed and validated for post-operative pain in children aged 1–7 years. The observer scores three behaviours, each from 0 to 2, for a total of 0–6. Its appeal is speed: three domains, a single observer, no equipment, with good inter-rater reliability reported across nursing staff (weighted kappa ~0.86–0.95 per item).
The three domains
| Domain | 0 | 1 | 2 |
|---|---|---|---|
| Facial expression | Neutral / positive | Somewhat negative, concerned | Clearly negative, grimace |
| Verbalisation | Neutral / positive | Pain complaints, sobbing | Crying loudly, screaming, inconsolable |
| Body position | Inactive / relaxed | Restless, shifting movements | Tense, rigid, guarding the wound |
Sum the three items for the total.
Interpreting the total
- 0–2 — adequate analgesia; continue to monitor.
- ≥3 — analgesia indicated.
A score of 3 or more is the conventional trigger to give or escalate analgesia. As with any behavioural scale, the number drives a reassess loop: score, treat, then re-score roughly 15–20 minutes after an intervention to confirm a response.
When to use it
Use BOPS in the immediate post-operative / recovery setting for toddlers and young children who cannot use a self-report tool. It is fast enough for frequent serial scoring at the bedside. Once a child can reliably use a self-report scale (e.g. faces or a numeric rating in older children), self-report takes precedence — pain is what the patient reports.
Worked example
A 3-year-old, one hour after inguinal hernia repair: clearly negative grimacing face (Facial 2), sobbing with pain complaints (Verbalisation 1), lying rigid and guarding the wound (Body 2) = 5/6. That is ≥3, so analgesia is indicated. After a weight-based analgesic, re-scored at 20 minutes: neutral face (0), settled and quiet (0), relaxed posture (0) = 0/6 — an effective response, documented as a before/after.
Pitfalls and caveats
- It is an observed-behaviour score, not a measurement of nociception. A quiet, withdrawn or exhausted child in real pain can under-score.
- Distress is not specific to pain — hunger, fear, a full bladder, separation from a parent or emergence agitation all raise the score. Interpret in context.
- Validated for 1–7 years and the post-operative setting — extrapolating to neonates, procedural pain or chronic pain is off-label for this tool; other validated scales (FLACC, CHEOPS, neonatal scales) may fit better.
- Score the trend, not just the absolute number. A documented drop after analgesia is far more informative than a single isolated score.
Run it: Behavioural Observational Pain Scale (BOPS)
Decision support for qualified clinicians only — verify against current primary guidelines and your clinical judgement.