Health Reference LibraryFerritin 120: is that normal or getting high?
This entry is part of the Nutri Tailor Health Reference Library — cited research on supplements, nutrients and adjacent areas of health.
Summary
Ferritin 120 µg/L is normal. It clears every deficiency threshold several times over and sits far below the levels that raise questions about excess iron, which begin hundreds of points higher, with WHO guidance flagging levels above 500 in adults who are not healthy for evaluation. For men, 120 is typical. For pre-menopausal women it is on the fuller side of common and still unremarkable. No iron action is indicated in either direction, and symptoms at 120 have an explanation other than iron.
Free iron and ferritin result interpreter
Enter what you have. Your ferritin alone works; the other fields sharpen the reading. Nothing you enter leaves this device. Nothing is saved. No AI is used, only published UK guideline thresholds.
This tool gives educational interpretation of published evidence. It is not personal dosing advice and it does not diagnose. It knows nothing about your history, symptoms or other results. Interpreting your results over time, alongside everything else about you, is what Nutri365 does.
How it works
A ferritin of 120 reflects well-filled iron stores. In a healthy adult the level is regulated, because absorption falls as stores rise, which is why iron does not ordinarily climb without limit from diet alone. The number drifts with body composition, training, alcohol intake and metabolic health, and modest year-to-year movement within 50 to 150 reflects this rather than a developing problem. Ferritin also behaves as an acute-phase protein, meaning a level that rises with inflammation, so an unusually high reading during illness overstates stores.
Timing
Routine blood tests are the only schedule this band needs. A repeat has value only if the sample was taken during illness, because ferritin rises with inflammation and a reading taken then can overstate the baseline.
Safety profile
The only iron-related caution at this band is not to add iron supplements to already replete stores, including through multivitamins chosen without checking the label. The standing warning signs are unchanged and unrelated to the ferritin. New unexplained symptoms need GP attention on their own merits.
Special populations
For men, 120 sits in the middle of the normal range. For pre-menopausal women it is on the fuller side, sometimes reflecting contraception that reduces menstrual loss, and needs no action. After menopause, women's levels shift up toward men's, and 120 becomes average. Anyone with a family history of haemochromatosis, the genetic iron-overload condition, and a rising trend even inside the normal range has a legitimate reason to mention it at a routine appointment, because genetic overload tends to show as a rising trajectory before it reaches a high level.
Guideline positions
The deficiency lines sit far below this band, with the WHO level at 15, the UK level at 30 and exclusion at 50. In the other direction, no guideline reads 101 to 150 as raised. WHO guidance from 2020 places its evaluation flag above 500 in adults who are not healthy, and clinical attention to a raised ferritin typically begins above 300, and then in context, with inflammation, liver health and alcohol the usual explanations well before iron overload. Population reference ranges for men commonly extend to 300 or beyond.
Practical framework
No action is indicated in either direction, meaning no iron supplementation and no avoidance measures, because 120 is not a high number. The useful step is to note the result with its date, so that future routine blood tests can show the trend. Symptoms that prompted the test now point away from iron, toward thyroid function, B12, vitamin D, sleep and overall load, which form the standard next tier of investigation. Nutri365 reads results such as this alongside tracking data and reported symptoms over time, checks for interactions and contraindications, and refers questions outside scope to a health specialist.
Ferritin thresholds at a glance (UK, µg/L)
| Threshold | Meaning | Source |
|---|---|---|
| Below 15 | Iron deficiency in apparently healthy adults | WHO 2020 |
| Below 30 | Iron deficiency confirmed in UK practice (92% sensitivity, 98% specificity) | NICE CKS / NHS |
| Below 40 | Deficiency highly likely (98% sensitivity and specificity) | NHS guidance |
| Above 50 | Deficiency excluded, unless inflammation is present | NHS guidance |
| Below 70 with inflammation | Deficiency still possible when CRP is raised | WHO 2020 |
| Above 500 | Possible overload or other disease, needs clinical evaluation | WHO 2020 |
Sources
- 2020. WHO guideline on use of ferritin concentrations to assess iron status. World Health Organization.
- 2024. Iron deficiency guidelines. NHS Scotland Right Decisions.
- 2023. Ferritin interpretation, a guide for GPs. Royal United Hospitals NHS (NICE CKS aligned).