How to calculate the normal filtered and excreted load of urinary calcium

How to calculate the normal filtered and excreted load of urinary calcium?

The serum calcium concentration is normally about 10 mg/dL. The kidney filters complexed and free calcium, which make up 60% of the total, or 6 mg/dL. The normal glomerular filtration rate (GFR) is 120 mL/min. Thus, the filtered load of calcium is 6 mg/100 mL × 120 mL/min × 1440 min/day = 10,368 mg/day. Because the kidney reabsorbs 98% of the filtered calcium, only 2% is excreted. Thus the kidney normally excretes about 200 mg of calcium/day (10,368 mg/day × 0.02 = 207 mg/day). If the excreted calcium level increases to 5%, the urinary calcium level increases to 500 mg/day.

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