investigations
Last reviewed 01/2018
Diagnosis is based on:
- low serum calcium
- increased plasma phosphate - low in hypocalcaemia due to intestinal malabsorption or vitamin D deficiency
- normal alkaline phosphatase - raised in hypocalcaemia due to chronic renal failure
- skull radiology may reveal basal ganglia calcification
- PTH: low plasma levels
- urinary cAMP excretion rises following administration of PTH