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Background and Aims Currently Ethyl chloride sprays are widely used across the world as a gold standard sensory measurement device for cold sensation after any neuraxial and regional nerve blocks in anaesthetics across the world. We have been using this new device called Cool Stick which provides an environment friendly and a cost effective alternative for sensory block measurement. Aim: We hypothesise that cool stick is an effective alternative to ethyl chloride and is non-inferior to ethyl chloride for measurement of cold sensation after a subarachnoid block or spinal anaesthesia in patients undergoing elective caesarean section.Methods In this service evaluation, both cool stick and ethyl chloride were used on each patient to assess cold sensation post-spinal anaesthesia. Two different anaesthetists independently assessed each patient using one method each, discreetly, to minimise observer bias. The order of testing (cool stick vs. ethyl chloride) was randomised to mitigate the effect of time elapsed post-spinal block. In all patients a separate technique was used to test light touch as standard, to decide if it was safe to proceed with surgery. Sensory levels were recorded, and statistical analyses included Bland-Altman analysis and the Wilcoxon signed-rank test.Results Bland-Altman analysis showed a mean difference (bias) of -0.05 dermatomes, with 95% limits of agreement from -1.80 to +1.70 dermatomes, indicating minimal systematic difference and acceptable clinical variability. The Wilcoxon signed-rank test showed no statistically significant difference between the methods (p = 0.6509).Abstract P086 Figure 1Cool stickAbstract P086 Figure 2Bland altman analysisConclusions Both Cool Stick and Ethyl Chloride are reliable tools for assessing sensory block following spinal anaesthesia. The high level of concordance and minimal bias suggest that Cool stick is non inferior to ethyl chloride and can be used interchangeably in clinical practice, Further studies with larger sample sizes could help validate these findings and explore their application in different anaesthetic settings.