Normal mean and <2 SD values for fetal hemoglobin

Gestational age, weeks	Mean hemoglobin, g/dL	<2 SD hemoglobin from the mean, g/dL
18	11.3	9.3
19	11.5	9.5
20	11.7	9.7
21	11.9	9.9
22	12.1	10.1
23	12.3	10.3
24	12.5	10.5
25	12.7	10.7
26	12.8	10.8
27	13.0	11.0
28	13.2	11.2
29	13.4	11.4
30	13.6	11.6
31	13.8	11.8
32	14.0	12.0
33	14.2	12.2
34	14.4	12.4

Two standard deviations below the mean is approximately 2 g/dL below the mean hemoglobin for gestational age.

SD: standard deviations; g/dL: grams/deciliter.

Data from: Nicolaides KH, Soothill PW, Clewell WH, et al. Fetal haemoglobin measurement in the assessent of red cell isoimmunization. Lancet 1988; 8594:1073.

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