Serum-ionized calcium as a diagnostic tool in hypercalciuria.
Serum-ionized calcium (Ca++) was measured in 65 patients with idiopathic calcium urolithiasis. The patients were then divided into hypercalciuric and normocalciuric groups based on the mean + SD of the control group, with greater than 180 mg/24 h in males and greater than 176 mg/24 h in females defined as hypercalciuria. The results showed a decrease in the tubular reabsorption of calcium in the hypercalciuric group, but not in the normocalciuric group. The hypercalciuric group was then further divided into group I with increased filtered load and group II with with normal filtered load. It was suggested that the group I hypercalciurics had absorptive hypercalciuria and group II renal hypercalciuria.
D000328:Adult; D002118:Calcium / Q000097:blood / Q000652:urine*; D005260:Female; D006801:Humans; D007477:Ions; D008297:Male; D008875:Middle Aged; D014545:Urinary Calculi / Q000175:diagnosis*
D007477:Ions; D002118:Calcium