Table 4.

Detection rate of Down's syndrome and indication for invasive testing in women above and below the age of 35 in Southampton during 1993-8

Diagnosis and indication for testing	No (%) of cases
	Women aged <35 years (n=17)	Women aged ⩾35 years (n=36)	All women (n=53)
Not diagnosed	8 (47)	9 (25)	17 (32)
Diagnosed:	9 (53)	27 (75)	36 (68)
Ultrasound anomaly	6 (35)	3 (8)	9 (17)
Previous history	1 (6)	2 (6)	3 (6)
Nuchal translucency	1 (6)	0	1 (2)
Serum screening anomaly	1 (6)	0	1 (2)
Maternal age	0	22 (61)	22 (42)