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OBJECTIVES: Our primary aim was to validate the Liverpool Peritonsillar abscess Score (LPS) externally in a new patient cohort. Our secondary aim was to modify the LPS in the light of the COVID‐19 pandemic to produce a no‐examination variant for use in this instance. DESIGN: Prospective multicentre external validation study. SETTING: Six different secondary care institutions across the United Kingdom. PARTICIPANTS: Patients over 16 years old who were referred to ENT with any uncomplicated sore throat such a tonsillitis or peritonsillar abscess (PTA). MAIN OUTCOME MEASURES: Sensitivity, specificity, positive predictive value and negative predictive value for both the original LPS model and the modified model for COVID‐19. RESULTS: The LPS model had sensitivity and specificity calculated at 98% and 79%, respectively. The LPS has a high negative predictive value (NPV) of 99%. The positive predictive value (PPV) was slightly lower at 63%. Receiver operating characteristic (ROC) curve, including the area under the curve (AUROC), was 0.888 which indicates very good accuracy. CONCLUSIONS: External validation of the LPS against an independent geographically diverse population yields high NPV. This may support non‐specialist colleagues who may have concerns about mis‐diagnosing a PTA. The COVID‐19 modification of the LPS has a similar NPV, which may be of use where routine oral examination is to be avoided during the COVID‐19 pandemic.
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document_parses/pdf_json/151f0f5989b651b174b84601e9b3f1028b1bf9fa.json
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document_parses/pmc_json/PMC7646663.xml.json
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A prospective multicentre external validation study of the Liverpool Peritonsillar abscess Score (LPS) with a no‐examination COVID‐19 modification
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