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sci.diagnostic-test-LR Calculator
Calculates positive and negative likelihood ratios (LR+ = sensitivity/(1−specificity); LR− = (1−sensitivity)/specificity) from a diagnostic test. LR+ > 10 strongly supports the diagnosis; LR+ 2–5 provides weak support — pre-test to post-test probability conversion uses the Fagan nomogram.
Inputs
Sensitivity Pct
Reference formula or conversion factor shown for context.
Specificity Pct
Reference formula or conversion factor shown for context.
Prevalence Pct
Reference formula or conversion factor shown for context.
Results
positive LR (LR+)
Reference formula or conversion factor shown for context.
negative LR (LR−)
The value at the specified point or condition.
post-test probability (positive result)
The final computed result based on the given inputs.
post-test probability (negative result)
The final computed result based on the given inputs.
LR+ = Se/(1−Sp)
Reference formula or conversion factor shown for context.
LR interpretation
Qualitative summary of what the computed numbers mean in practical terms.