Postoperative pain management is based on assessment of severity of pain. Adult patients can express their pain accurately but difficulty occurs in paediatric population. Children between two to seven years of age may give biased response to any scale of pain assessment as they belong to the preoperational stage of cognitive development. To establish the agreement between two pain scale, namely Faces Pain Scale-Revised (FPS-R) and Face, Legs, Activity, Cry, Consolability scale(FLACC) regarding assessment of severity of post operative pain and to find out true negative in terms of specificity of combination of scale for assessment of post operative pain.

Settings and design: Post operative recovery unit, cross sectional analytical study

Four hours after short surgical procedure ninety five children were assessed by two pain scale and by two observers simultaneously and data submitted to analyser. Statistical analysis: IBM SPSS (Version 20.0). P<0.05 was considered as statistically significant.

Combination of these two scales show high odds ratio(39%) and kappa coefficient (0.76) suggesting excellent agreement. Specificity of combination of these scales is very high(95.1%) than individual(FPS-R-17.85%,FLACC-2.2%). Spearman’s correlation coefficient () was computed to ascertain the correlation between two scales and a significant positive correlation was found (=0.727, p=0.00).

FPS-R and FLACC scale has excellent agreement to diagnose the severity of post operative pain in two to seven years of age group and combination of these two scales has high specificity to assess the severity of post-operative pain than individual.