This tool supports structured infectious-disease decision making but does not replace clinician judgement or local guideline pathways.
This OpiCalc infectious-disease entry reflects commonly used guideline criteria and bedside risk features used in contemporary clinical practice.
Procalcitonin Stop Rule: Use PCT kinetics alongside clinical stability to support antibiotic discontinuation.
PCT decline >80% from peak
+3 Points
Absolute PCT <0.25 µg/L
+2 Points
Clinical stability achieved
No uncontrolled source
+1 Points
Profound immunosuppression
-1 Points
Ongoing sepsis or shock
-3 Points
Assessment Tier
Score 0
Current profile does not support stopping antibiotics.