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Case causality worksheet (Naranjo and WHO-UMC)

Scores one suspected adverse drug reaction on two published scales. Runs in your browser; nothing is sent or stored.

This is a structured summary to take to a clinician or to attach to a report, not a diagnosis and not medical advice. The scales were designed for trained assessors; answer “unknown” when you do not know. If you are unwell, contact a health professional.

Naranjo CA et al. A method for estimating the probability of adverse drug reactions. Clin Pharmacol Ther 1981;30:239-45 (PMID 7249508). WHO-UMC causality categories: Uppsala Monitoring Centre, The use of the WHO-UMC system for standardised case causality assessment. Cut-points as published: Naranjo definite ≥ 9, probable 5–8, possible 1–4, doubtful ≤ 0.

Case causality worksheet (Naranjo and WHO-UMC)

The case