Comorbidity & Cognitive Screening
Every comorbidity & cognitive screening calculator on CalcEngines — unit converters, derived indices and interpretive tools, each with its formula, a worked example and the reference intervals it is judged against.
8 calculators in this section
- 4AT Delirium Assessment CalculatorFour items, 0 to 12, with two of them worth 4 points each so either can reach the threshold alone. Pooled sensitivity and specificity are both 0.88 across 17 studies — and at low prevalence most positives are still false.
- Abbreviated Mental Test Score CalculatorTen questions, one point each, from Hodkinson's 1972 paper. The published cut-offs disagree by two points, which leaves a band one point wide where a patient is abnormal on one source and normal on the other.
- Age-Adjusted Charlson Comorbidity Index CalculatorAdd one point for each complete decade of age over 40 to a Charlson comorbidity score. The rule as published and the rule as implemented part company above 89, and this page prints both.
- Charlson Comorbidity Index CalculatorThe original 1987 weights, with the hierarchy the index intends and the one-year mortality each stratum carried in the 559-patient derivation cohort. Quan's 2011 weights are printed alongside, because they give this patient a different number.
- Comorbidity Index Selection InterpreterCharlson and Elixhauser were derived from different data against different outcomes, and so were their several weightings. This names which published index was derived for the question you are asking — and says when none was.
- Elixhauser Comorbidity Index CalculatorElixhauser is a condition list, not a score. Collapsing it to one number means picking a published weighting, and the published weightings are different instruments: this page uses van Walraven's and prints the alternatives beside them.
- Quan Updated Charlson Comorbidity Index CalculatorQuan and colleagues re-derived the Charlson weights in 2004 Calgary discharge data and published twelve of them in 2011. Five of the original nineteen conditions now score nothing. This page carries no bands, and says why.
- Short Blessed Test CalculatorSix items, weighted error scores, 0 to 28, from Katzman's 1983 short Orientation-Memory-Concentration Test. Higher is worse. The same six items and weights are what the separately copyrighted 6-CIT scores, which is why this page cites the 1983 original.