Baseline

A baseline in medicine is information found at the beginning of a study or other initial known value which is used for comparison with later data. The concept of a baseline is essential to the daily practice of medicine in order to establish a relative rather than absolute meaning to data. The meaning of baseline in medicine is very similar to that of the running baseline (baseball) being the direct path that a baserunner is taking to the base he is in route to. If the baserunner is outside the 3 foot margin around his running baseline, then he is considered out. Whereas if a patient with kidney failure (whose creatinine is usually 3.0 mg/dL) suddenly has a creatinine of 5.0 mg/dL, then his creatinine is out of his normal. For that person with kidney failure, absolute normal no longer applies because he will never again be able to obtain an absolutely normal creatinine level (0.5–1.2 mg/dL) with kidneys that no longer function properly.

## See also

* 1970 ascariasis poisoning incident
* Creatinine
* Patient zero
* Wilder's law of initial value

## External links

* medterms.com Medical Dictionary

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