How is measured creatinine clearance calculated

How is measured creatinine clearance calculated?

Creatinine clearance is calculated using timed urine collection. The time is often 24 hours but can be as short as 4 or 6 hours. The clearance formula and an example is as follows.

where A is the generic clearance formula. B substitutes some typical values. C. Shows that the units all cancel out except mL/min.

Note: to convert the 24-hour measurement to the conventional units of mL/min, one needs to convert 24 hours to minutes, by dividing by the number of minutes in a day, 1440. All the units cancel each other out except mL/min.


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