Table 2.

Differential diagnosis of hypophosphatemic rickets in children

	VDRR	Proximal RTA	Dent's disease
Gender	Both	Both	Male
Ser. phosphate	Low	Low	Low
Ser. calcium	Normal	Low	Normal
Calcitriol levels	Normal/low	Low	Normal/Mild high
Hypercalciuria	No	No	Yes
Nephrocalcinosis	No	No	Yes
Ser. PTH	Normal/mild high	High	Normal

VDRR = Vitamin-D resistant rickets; RTA = Renal tubular acidosis; PTH = Parathormone