FEVER OF UNKNOWN ORIGIN Old definition 1. Fever higher than 383C on several occasions 2. Duration of fever -3 weeks 3. Uncertain diagnosis after one week of study in hospital New Definition D Eliminated the in-hospital evaluation requirements>3 outpatient visits, or 3 days in hospital.. Ambulatory as well as in hospitalFEVER OF UNKNOWN ORIGIN  Old Definition: 1. Fever higher than 38.3oC on several occasions. 2. Duration of fever – 3 weeks 3. Uncertain diagnosis after one week of study in hospital  New Definition:  Eliminated the in-hospital evaluation requirements → 3 outpatient visits, or 3 days in hospital. … Ambulatory as well as in hospital