Iron & Ferritin: Why You're Exhausted Even When Your Bloodwork Is "Normal"
You're exhausted, but your blood test came back "normal." Dr. Michal Waldfogel, ND, explains the ferritin gap — why standard tests miss iron deficiency, and why it's a hidden cause of fatigue in so many women.
The ferritin gap
A standard blood test checks hemoglobin — and it can read "normal" while your ferritin, your body's actual iron stores, runs empty. The condition has a name: iron deficiency without anemia. Dr. Michal Waldfogel's advice is simple — ask for a ferritin reading, not just standard blood work.
Why you're so tired
Iron deficiency is one of the biggest hidden causes of fatigue in menstruating women. If you're exhausted in the first days of your bleed, low iron belongs near the top of the list — it's testable, addressable, and worth ruling out before you accept tiredness as your baseline.
It might not be iron at all
Anemia can also come from low B12 or folate — so "I'm anemic, I need iron" can mean supplementing the wrong thing. Many women carry the common MTHFR variation, which changes how well they absorb these vitamins. If iron hasn't moved the needle, methylation is worth looking into.
The markers to ask for
Most of these can be ordered by a regular doctor: ferritin, red blood cell count, MCV, B12, folate, and homocysteine. Dr. Waldfogel's bigger point — you are the most important person on your healthcare team. Walk in with the list, and ask directly.
About Dr. Michal Waldfogel
Dr. Michal Waldfogel, ND, is a naturopathic doctor whose work centers on helping women feel confident, embodied, and empowered in their own healthcare — knowing both how to support their bodies and when to seek additional care. Learn more at phillynaturopathic.com.
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