It is OK for serum units (e.g. mg/dL) to be different from urine units (e.g. mg/day), but both serum and urine should still be using the same system (US or SI).
It is also OK for urine values to be concentration (e.g. ml/dL) or daily excretion (e.g. mg/day).
> 0.01: Familial Hypocalciuric Hypercalcaemia (FHH) is unlikely
< 0.01: Familial Hypocalciuric Hypercalcaemia (FHH) is likely
Other Causes PTH-dependent hypocalciuric hypercalcemia:
1. vitamin D deficiency
2. very low calcium intake
3. mild renal insufficiency
Examples of unit converters: