The goal of this website is to hold the symptoms and numbers that a brain just can't. Who can be expected to remember all the potential symptoms of the thousands of diseases that exist? Furthermore, it is equally impossible to memorize the utility of the tests designed to diagnose these diseases.

This site was designed and its data collected by a practicing Canadian internist/nephrologist. Data is from an adult population unless otherwise noted.

Details on Diagnostic Utility Data Collection

The data here is biased. The entire literature was not culled, although meta-analyses, when found, were preferred over individual studies. Attempts were made to find the most recent studies and to include data from those that were strong. If a study did not report likelihood ratios specifically, these were calculated using the excel spreadsheet found here. If specificity or sensitivity was 100% in these studies (meaning one subgroup of the 2x2 table had zero patients), all cells had a value of 0.5 added to prevent a zero or infinite LR without a confidence interval. Confidence intervals are reported to reinforce the fact that an average value only represents a range of values that, in some cases, can vary over a very large range.


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