Why the blood count misses it
Iron stores deplete in stages. Ferritin — the storage form — falls first. Only once stores are exhausted does haemoglobin drop and anaemia appear. Fatigue, breathlessness on exertion, poor concentration, hair shedding and restless legs can all appear in that earlier stage, while a standard full blood count still reads normal.
Why it matters more in perimenopause
Perimenopausal cycles frequently become heavier and longer before they stop, which increases losses at exactly the age when they are least likely to be investigated. Heavy menstrual bleeding is itself worth investigating rather than tolerating — it has treatable causes, and persistent or post-menopausal bleeding always needs assessment.
How it is read properly
Ferritin rises with inflammation and with liver disease, so a normal-looking value can hide depleted stores. Reading it alongside hs-CRP, serum iron, TIBC and transferrin saturation separates real sufficiency from a falsely reassuring number. Supplementing without measuring is a bad idea in the other direction too: iron overload is harmful, and haemochromatosis is not rare.
Key points
- Ferritin falls long before haemoglobin — the blood count reassures falsely.
- Heavy perimenopausal bleeding needs investigating, not tolerating.
- Read it with hs-CRP and transferrin saturation, and never supplement blind.
AZZA Medical is not a medical provider and does not practice medicine. Medical services are provided exclusively by independently licensed physicians of our partner physician network and their affiliated professional entities.
Compounded drugs are not FDA-approved and have not been evaluated by FDA for safety or effectiveness.
This is not emergency care. AZZA Medical does not provide urgent or emergency medical services. If you are experiencing a medical emergency, call 911 or go to your nearest emergency room.