If you've ever been told your blood work is "normal" but you still feel tired, sluggish, or like your performance is declining, low ferritin might be the reason nobody checked.
Ferritin is a protein that stores iron in your body. Your ferritin level tells you how much iron you have in reserve. It's one of the most practical and informative blood tests you can order, and one of the most commonly overlooked.
Ferritin vs. Hemoglobin: Why Both Matter
Hemoglobin is included in a standard complete blood count (CBC). If your hemoglobin is low, you're anemic. But ferritin drops long before hemoglobin does. Your body uses ferritin as a reserve: when iron intake isn't keeping up, your body draws from those reserves to maintain hemoglobin production. Your hemoglobin stays normal while your ferritin is declining.
Ferritin catches this early. It shows you whether your iron reserves are healthy, depleting, or already low, while your other markers still look normal.
Symptoms of Low Ferritin
Low ferritin can produce symptoms even when you're not technically anemic:
- Fatigue and low energy that doesn't improve with more sleep
- Decreased exercise performance and endurance
- Slower recovery from training
- Difficulty concentrating or brain fog
- Shortness of breath during exertion
- Increased susceptibility to illness
- Hair thinning or loss
- Restless legs, especially at night
Who's Most at Risk?
- Active individuals and athletes: exercise increases iron demand through increased red blood cell production, iron lost through sweat, and foot-strike hemolysis.
- Women of reproductive age: menstruation is the most common cause of iron loss.
- Plant-based eaters: non-heme iron from plant sources is absorbed less efficiently.
- Frequent blood donors: each donation removes a significant amount of iron.
- People with digestive issues: conditions affecting iron absorption can lead to low ferritin.
What Ferritin Level Should You Aim For?
Standard reference ranges consider anything above 12-15 µg/L as "normal." But "normal" and "optimal" are not the same thing:
- Below 15 µg/L: iron deficient
- 15-30 µg/L: technically normal but likely suboptimal if you're active
- 30-50 µg/L: a common grey zone
- Above 50 µg/L: generally considered adequate for active individuals
- 50-100 µg/L: the range many sports medicine practitioners target
How to Get Your Ferritin Tested
You can order a ferritin test through Bespoke Labs. Consider adding a CBC and iron studies for a complete picture. Walk into any Dynacare location in Ontario. No appointment needed. If you're active, if you're tired, or if you just want to know where your iron stores stand, this is one of the most useful tests you can order.