1.

A 2 year old boy has vitamin D refractory rickets.Investigations show serum calcium 9 mg/dl.Phosphate 2.4 mg/dl,alkaline phosphate 1040 IU.Parathyroid hormone and bicarbonate levels are normal.The most probable diagnosis is.

A. Distal renal tubular acidosis
B. Hypophosphatemic rickets
C. Vitamin D dependent rickets
D. Proximal renal tubular acidosis
Answer» C. Vitamin D dependent rickets


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