HbF by age and sex
How the usual range for HbF changes with age, as labs print it.
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The usual range at every age
The reference range labs print, for each age group. Ranges differ a little between labs, so the range on your own report is the one your result is judged against.
Use the left and right arrow keys to step through the age groups. Every range is also in the table below.
| Who | Usual range |
|---|---|
| under 0.1667 | 45.8–91.7 % |
| 0.1667–-0.75 | 32.7–85.2 % |
| 0.25–-0.6667000000000001 | 14.5–73.7 % |
| 0.3333–-0.5832999999999999 | 4.2–56.9 % |
| 0.4167–-0.5 | 1–38.1 % |
| 0.5–-0.25 | 0.9–19.4 % |
| 0.75–0.08329999999999993 | 0.6–11.6 % |
| 1.0833–1 | 0–8.5 % |
| 2+ | 0–2.1 % |
Sources: ARUP Laboratories, Mayo Clinic Laboratories, University of Iowa Hospitals & Clinics, Blood Reviews, American Family Physician, NHS England (NHS Sickle Cell and Thalassaemia Screening Programme)