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Introduction WatchPAT® is a portable home sleep apnoea test and diagnostic device that uses innovative technologies to ensure the accurate detection of Obstructive Sleep Apnoea (OSA). 1 In this audit we compared the auto-analysis vs manual scoring for AHI3%, ODI3%, AHIc, AHI4%, ODI4% and Respiratory Disturbance Index (pRDI). We recorded the analysis time taken to manually score each study and compared the differences to determine if the manual scoring made a significant difference to the overall diagnosis of the study. We particularly wanted to check if manually scoring changed classification of severity of sleep apnoea on the study.Methods In this non-blind study, we compared the auto analysis reporting of watchpat vs manual reporting of 65 patients (Males=34) with an average BMI of 36.08 kg/m2 (Range: 19.8 kg/m2 – 54.4 kg/m2). The average age was 48 years (Range: 20 yrs – 77 yrs). The average time spent manually reporting the studies was 7 mins, 44 seconds (Range: 2 mins, 22 seconds- 16 mins, 35 seconds). The values for AHI3%, AHIc, ODI3%, AHI4%, ODI4% and pRDI were recorded using the auto-analysis. The length of time to manually score the study was recorded using a timer and the difference in values recorded.Results Results are shown in table 1. There was a significant difference noted across AHI3%, ODI3%, AHIc, AHI4% (P <0.001) and ODI4%, pRDI (P <0.05).Conclusion When comparing Automatic and Manual scoring, there were significant difference noted across all parameters investigated. This shows that manual verification is still valid and appropriate when using WatchPAT device for OSA. This is supported by recent ARTP guidance that ‘computer analyses should never be accepted without being validated by an experienced practitioner. 2 If this validation has not been performed it should be clearly indicated on a report.’ When exploring the clinical difference, there were several studies, which changed classification as noted in table 2. Therefore, there could have clinical treatment ramifications with the changes in classification.Abstract P31 Table 1Mean + St error of automatic vs manual analysisAbstract P31 Table 2Matrix graph of the difference in AHI 3% classification of OSA comparing auto vs manual analysisReferences Accuracy of WatchPAT for the Diagnosis of Obstructive Sleep Apnea in Patients with Chronic Obstructive Pulmonary Disease – PMC ARTP Standards of Care – Sleep Apnoea (Diagnostics) Version 8.docx