Upper Limit of Hemoglobin F During Infancy

Age in Months

Lower Limit for Hemoglobin F

Upper Limit for Hemoglobin F

0

70

90%

1

50

75%

2

25

60%

3

10

35%

4

5

20%

6

0

8%

9

0

5%

12

0

2%

adult

0

very low

Age in Months

Percent Hemoglobin F at Upper Limit of Normal

0 to 2 months

90 - (15 * (age in months))

2 to 6 months

(-0.368 * ((age in months)^3)) + (7.963 * ((age in months)^2)) - (57.53 * (age in months)) + 146.1

6 to 12 months

14 - (age in months)