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Printed on 4/21/2026
For informational purposes only. This is not medical advice.
The Delirium Rating Scale-Revised-98 (DRS-R98) is a clinician-rated instrument used to quantify delirium severity and support diagnostic characterization. It is often used in consultation-liaison psychiatry, geriatrics, and research to monitor symptom trajectories over time.
Formula: DRS-R98 severity score is a summed clinician-rated total, often represented on a 0-39 range.
DRS-R98 is a widely cited delirium severity and phenomenology instrument with broad validation literature.
Higher DRS-R98 totals indicate more severe delirium manifestations and support intensified management.
Use when a structured delirium severity metric is needed for baseline and serial clinical tracking.
Administration requires trained assessment and can be more time-intensive than ultra-brief screens.
For related assessments, see MDAS, DOSS and CAM Delirium Screen.
Disclaimer: This tool is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider with questions about your health.
A 10-domain delirium severity scale (0-30) commonly using cutoff around >=13 for delirium signal.
GeriatricsA nursing observation-based delirium screen scored 0-13, with >=3 commonly treated as positive.
GeriatricsScreen for delirium using the CAM (Confusion Assessment Method). Gold standard with ~94% sensitivity and ~89% specificity. Requires acute onset + inattention, plus disorganized thinking or altered consciousness.
GeriatricsA nurse-observed 0-30 confusion scale for early detection of cognitive fluctuation and delirium signal.