Doppler of the Middle Cerebral Artery to Assess Fetal Anemia

TABLE E-1

Threshold of Peak Velocity of Systolic Blood Flow in the Middle Cerebral Artery Above Which Mild, Moderate, and Severe Anemia Occurs

Gestation (wk)	THRESHOLD OF PEAK VELOCITY OF MIDDLE CEREBRAL ARTERY (cm/sec) ABOVE WHICH DEGREE OF ANEMIA IS CLASSIfiED
Gestation (wk)	1.00 (Median)	Mild Anemia (1.29 MoM)	Moderate Anemia (1.50 MoM)	Severe Anemia (1.55 MoM)
18	23.2	29.9	34.8	36.0
20	25.5	32.8	38.2	39.5
22	27.9	36.0	41.9	43.3
24	30.7	39.5	46.0	47.5
26	33.6	43.3	50.4	52.1
28	36.9	47.6	55.4	57.2
30	40.5	52.2	60.7	62.8
32	44.4	57.3	66.6	68.9
34	48.7	62.9	73.1	75.6
36	53.5	69.0	80.2	82.9
38	58.7	75.7	88.0	91.0
40	64.4	83.0	96.6	99.8