Familial hypocalciuric hypercalcemia

Familial hypocalciuric hypercalcemia, abbreviated FHH, is an inherited condition in which the level of calcium in the blood runs high, a state called hypercalcemia, defined in the source as a serum calcium typically above 10.2 mg/dL. The condition is uncommon. It is also called familial benign hypocalciuric hypercalcemia, or FBHH, a name used where there is usually a family history of mild hypercalcemia. The defining laboratory pattern is that the blood calcium is raised while the kidneys excrete little calcium, with a urine calcium to creatinine ratio below 0.01 and urine calcium under 200 mg per day, which is the hypocalciuria of its name. This entry records how the condition is defined and named, and is not medical advice.