What serum calcium can tell us and what it can’t

What serum calcium can tell us and what it can’t.
Houillier P, Froissart M, Maruani G, Blanchard A.

Nephrol Dial Transplant. 2006 Jan;21(1):29-32

As in normal subjects and patients with normal renal function, the calcium balance may be positive, normal or negative in patients with chronic kidney disease in the absence of any overt abnormality in serum calcium concentration. Therefore, the mere consideration of the serum calcium concentration is of no help to predict calcium balance in these patients.