This version was machine-translated from German and has not been medically reviewed. The authoritative version is the German version.
Yale Observation Scale (YOS)
Six observations in febrile children under 2 years, each 1, 3 or 5 points – above 10 points the child appears ill (McCarthy 1982)
Calculation aid for healthcare professionals: the calculator reproduces what the sources cited assign to the inputs. Clinical assessment and every treatment decision remain with the treating physician. Inputs and results are not stored.
Frequently asked questions
Yale Observation Scale (YOS): What does this calculator compute?
Yale Observation Scale (McCarthy 1982) for febrile children under 2 years: crying, reaction to parents, alertness, skin color, hydration and response to social overtures with 1, 3 or 5 points each. Total 6 to 30; up to 10 unremarkable, above 10 abnormal. With reservation: in infants up to 60 days the scale does not reliably detect serious infections.
Yale Observation Scale (YOS): Which sources is this calculator based on?
McCarthy PL, Sharpe MR, Spiesel SZ, et al.: Observation scales to identify serious illness in febrile children (Pediatrics 70:802–809) (1982); McCarthy PL, Lembo RM, Baron MA, Fink HD, Cicchetti DV: Predictive value of abnormal physical examination findings in ill-appearing and well-appearing febrile children (Pediatrics 76:167–171) (1985); Nigrovic LE, Mahajan PV, Blumberg SM, et al.; PECARN: The Yale Observation Scale score and the risk of serious bacterial infections in febrile infants (Pediatrics 140:e20170695) (2017)