The doctor said the results of my Mother’s (age 98) blood work showed her creatinine at 147. Most of the time I see creatinine measured in percentages. How does this number relate? Her potassium 5.1. She does have impaired kidney function and has had for many years. Significant fluid retention in her legs with history of blood clots. At what creatinine level are the kidneys unable to function?

The results that you quote suggest that the serum creatinine is being expressed in micromole per liter (mcmol/L or umol/L) rather than milligrams per deciliter (mg/dl).  The former is expressed in scientific notation and the latter is the more common laboratory measurement.  You can use either one to calculate your mother’s estimated glomerular filtration rate (eGFR).  You can go to our web site and learn how to calculate the eGFR from the result that you quote at:  https://www.kidney.org/professionals/KDOQI/gfr_calculator

 

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