Table 1

The investigation of patients, before and after diagnosis, across different age groups and the percentage of abnormal tests (yield)

	<1 y (n=72)		1–4 y (n=35)		5–17 y (n=73)		>18 y (n= 27)
Age range	% tested	% yield	% tested	% yield	% tested	% yield	% tested	% yield
Echo	97	97	94	87	86	70	63	76
Calcium levels	89	50	69	25	66	42	37	20
Renal ultrasound scan	42	13	35	25	38	25	15	50
Lymphocyte count	68	57	43	47	26	11	11	33
Parental karyotype	88	22	86	13	78	16	30	0