Table 1.

Triplet non-invasive monitoring by middle cerebral artery peak systolic velocity (MCA PSV) for foetal anaemia throughout pregnancy

		23+6 weeks	24+4 weeks	25+4 weeks	26+3 weeks	27+3 weeks	28+3 weeks	28+6 weeks	30+5 weeks	31+6 weeks	32+6 weeks	33+2 weeks
Triplet 1	MCA PSV	37	37	38	42	44	56	50	38	43	48	50
	MOM	1.2	1.1	1.1	1.2	1.2	1.5	1.3	<1	<1	1.0	1.1
Triplet 2	MCA PSV	37	37	37	41	46	56	45	32	45	52	54
	MOM	1.2	1.1	1.1	1.1	1.2	1.5	1.1	<1	1.0	1.1	1.2
Triplet 3	MCA PSV	29	37	32	40	38	53	48	29	54	55	56
	MOM	<1	1.1	<1	1.1	1	1.4	1.2	<1	1.2	1.1	1.5

MCA PSV, middle cerebral artery peak systolic velocity; MOM, multiples of the median.