PTH | Infancy | Childhood |
---|---|---|
Normal or raised | ▸ Neonatal severe hyperparathyroidism (calcium-sensing receptor defect) | ▸ Calcium-sensing receptor defect (FHH)▸ Hyperparathyroidism |
Low | ▸ Williams syndrome ▸ Vitamin D excess ▸ Hypophosphatasia ▸ Mutations within the gene coding for this enzyme, CYP24A1 ▸ Idiopathic hypercalcaemia of infancy | ▸ Malignancy, for example, lymphoma, leukaemia ▸ Vitamin D excess ▸ Granulomatous disease ▸ Thyrotoxicosis |
FHH, familial hypocalciuric hypercalcaemia; PTH, parathyroid hormone.