# Iron Blood Test Results: Ferritin and Iron Levels Explained

> Your iron studies came back abnormal and you are not sure what it means. Ferritin, serum iron, TIBC, and transferrin saturation explained clearly so you know.

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Iron Studies: Why You Are So Tired (Probably)
If you clicked on this page, there is a good chance you are exhausted and trying to figure out why. Iron deficiency is the most common nutritional deficiency in the world, and it is wildly underdiagnosed. You know why? Because most doctors look at your hemoglobin, see it is "normal," and tell you everything is fine. But your iron stores can be tanking for years before your hemoglobin drops.
Iron is what lets your red blood cells carry oxygen. When iron gets low, your cells are basically suffocating. No wonder you feel like you need a nap at 2pm every single day.
Tests Included in Iron Studies
Serum Iron - the amount of iron floating in your blood right now
Ferritin - your iron savings account, this is the big one
TIBC (Total Iron-Binding Capacity) - measures how much room your blood has for more iron
Transferrin Saturation - what percentage of your iron-carrying proteins are actually loaded with iron
Transferrin - the protein that transports iron through your bloodstream
UIBC (Unsaturated Iron-Binding Capacity) - the amount of transferrin that is not yet carrying iron
The Ferritin Problem
Here is where it gets frustrating. Most labs list ferritin as "normal" starting at around 12-15. That is the bare minimum to not have outright anemia. Functional medicine practitioners and many hematologists consider optimal ferritin to be 50-100 for women and 75-150 for men. So you can have a ferritin of 18, feel absolutely terrible, and be told your labs are fine.
Also, ferritin is an inflammation marker too. If you have an infection, autoimmune condition, or liver disease, your ferritin can look artificially high even when your actual iron stores are low. That is why you need the full panel, not just ferritin alone.
Who Should Get Iron Studies
Women with heavy periods (the number one cause of iron deficiency in premenopausal women). Vegetarians and vegans. Distance runners. Frequent blood donors. Anyone with unexplained fatigue, pale skin, brittle nails, cold hands and feet, or restless legs. And if you are pregnant, get this checked now, not later.
Upload your iron panel and I will show you where your levels actually stand, not just where the lab says they should be.
Upload your iron studies and stop guessing.