Yale Observation Scale (YOS)

When it activates

Scribeable activates a calculator from the encounter. The Yale Observation Scale (YOS) can activate when the transcript or pasted chart context documents any of these:

• Febrile child assessment
• Serious bacterial illness risk
• Pediatric fever evaluation
• Toxic-appearing child
• Febrile infant workup decision

Inputs the note needs

6 inputs. Each is resolved from the transcript, the pasted chart context and charted labs; at this calculator’s tier a missing input is never requested, and a missing required input keeps the score out of the draft.

Scoring

6 items each scored 1, 3, or 5: quality of cry, reaction to parent stimulation, state variation, color, hydration, response to social overtures. Total score 6-30.

Interpretation

Score <=10: Low risk for serious illness (<3%) — outpatient management appropriate with close follow-up. Score 11-15: Moderate risk (~26% SBI risk) — further workup indicated (CBC, blood culture, UA, consider LP in young infants). Score >16: High risk (~92% SBI risk) — full sepsis workup, empiric antibiotics, hospital admission. Most useful in children 3-36 months. Does not replace clinical judgment for toxic-appearing children (immediate intervention regardless of score).

Evidence

Sources carried in Scribeable's citation registry for this calculator; guideline version: McCarthy 1982.

• McCarthy PL et al. Observation scales to identify serious illness in febrile children (Yale Observation Scale)McCarthy et al. (Yale Observation) 1982 · 1982 · link last verified 2026-03-28

How Scribeable handles it in the note

When an encounter activates the Yale Observation Scale (YOS) (its highest tier is recommended), Scribeable does not ask you for missing inputs. The score is computed in code from whatever inputs resolve from the transcript, the pasted chart context or charted labs; a computed value is written into the draft only when every required input already resolves.

The score is computed in code from the resolved inputs, not recalled by the language model. A stated Yale Observation Scale (YOS) value is compared against the computed one when the draft's structured summary carries it; a disagreement found there is flagged to the second drafting pass, which is instructed to correct the score and its interpretation, unless Scribeable has supplied the computed value to that pass, in which case the value the draft writes is checked against the supplied one and a detected difference is shown beside the note for you to adjudicate rather than silently rewritten.

Classified as a risk score: activated strictly, by a documented trigger, never by a permissive reading of the encounter.

Related calculators

• SIRS Criteria (Systemic Inflammatory Response Syndrome)Identifies systemic inflammatory response to guide early sepsis recognition and management
• Body Mass Index (BMI)Classifies weight status relative to height to guide nutritional counseling, surgical risk, and metabolic assessment
• Modified Centor / McIsaac ScoreEstimates likelihood of group A streptococcal pharyngitis to guide testing and antibiotic decisions
• CHA2DS2-VASc ScoreStratifies stroke risk in non-valvular atrial fibrillation to guide anticoagulation decisions
• Cockcroft-Gault Creatinine ClearanceEstimates creatinine clearance for renal drug dosing adjustments, particularly DOACs and renally-cleared medications
• Maintenance IV Fluids (4-2-1 Rule)Calculates hourly maintenance IV fluid rate using the Holliday-Segar method based on body weight

Can activate in: Primary Care, Emergency Medicine, Pediatrics.