Health Reference LibraryFerritin 85: what does a result between 71 and 100 mean?
This entry is part of the Nutri Tailor Health Reference Library — cited research on supplements, nutrients and adjacent areas of health.
Summary
Ferritin 85 µg/L is a normal result. It sits above every deficiency threshold in use, including the WHO inflammation-adjusted level of 70, and far below any level that raises questions about excess iron. Iron stores are therefore not the explanation for symptoms at this level, and no iron action is indicated in either direction. Where tiredness or other symptoms prompted the test, a result of 85 redirects the search toward sleep, thyroid function, B12 and vitamin D.
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
At 85 the iron reserve is substantial. Losses are covered, red cell production is supplied, and it would take many months of net deficit for stores to fall into questionable territory. Ferritin also behaves as an acute-phase protein, meaning a level that rises during illness or inflammation, but at this height the effect changes little, because even a reading inflated by illness would leave the true value clear of the deficiency lines for most adults.
Timing
No retest schedule applies to this band, and routine future blood tests will track it. The number tends to drift with life phase, training load and diet, and movement within 50 to 150 is unremarkable in both directions.
Safety profile
Iron supplementation at 85 has no purpose. The standing warning signs are unchanged. Unexplained bleeding, weight loss or persistent new symptoms belong with a GP on their own merits, and a normal ferritin does not postpone that.
Special populations
For anyone with heart failure, chronic kidney disease or inflammatory bowel disease, 85 is not automatically the all-clear it is for healthy adults, because guidance in those conditions reads a ferritin below 100 alongside transferrin saturation, and that assessment belongs with the clinical team. For menstruating women, 85 is a strong base heading into pregnancy planning. For men, 85 is mid-normal. Regular blood donors sit at this level comfortably and can donate without special measures.
Guideline positions
Every threshold reads the 71 to 100 band the same way. The deficiency lines, meaning the WHO level of 15, the UK level of 30, the exclusion level of 50 and the inflammation-adjusted level of 70, all sit below it. Concern in the other direction begins far above, with WHO guidance from 2020 flagging levels above 500 in adults who are not healthy for evaluation, and clinical attention to a raised ferritin typically beginning above 300. One exception applies in chronic disease. Guidance in heart failure, chronic kidney disease and inflammatory bowel disease reads a ferritin below 100 alongside transferrin saturation, a second iron measure, so in those conditions a result of 85 remains part of a wider clinical assessment.
Practical framework
Nothing needs correcting or supplementing at this level. The practical value of 85 is what it removes from the search. Symptoms present at this ferritin have their cause elsewhere, and the productive next steps are the other measurable causes, meaning thyroid function, B12 and vitamin D, alongside sleep and overall load. Ordinary dietary variety maintains this level without attention. 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).