Κλασματική απέκρισση Ca Ca/Cr clearance ratio = [24-hour Urine Ca x serum Cr] ÷ [Serum Ca x 24- hour Urine Cr] The ratio of calcium (Ca) clearance to creatinine (Cr) clearance may be used for the diagnosis of FHH using the following formula: Cl Ca/ Cl Cr = (Ca u x Cr s )/Cr u x Ca s ) where Ca u = urinary Ca concentration, Cr s = serum Cr concentration, Cr u = urinary Cr concentration, and Ca s = serum Ca concentration.
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