Ferritin checker — iron, thyroid & energy
Enter your ferritin (iron stores) to see what it means — including the important gap between what a lab calls “normal” and what is functionally optimal for thyroid function and energy.
— µg/L
Medical disclaimer: This calculator is for general educational purposes only and does not constitute medical advice or a diagnosis. Results are estimates based on the values you enter and standard formulas and reference ranges, which vary between laboratories and between individuals. Always discuss your results with a qualified healthcare professional. If you are experiencing a medical emergency, call 9-1-1.
“Normal” isn’t the same as “optimal”. Most lab reference ranges flag ferritin as normal above about 12–15 µg/L. But functional iron deficiency — where ferritin is technically in range yet too low for optimal thyroid-hormone conversion and energy — typically occurs below 50–70 µg/L. If your ferritin is 20 and your GP says it’s “normal,” that answer may be technically correct but clinically inadequate, especially with fatigue, hair loss, or a thyroid condition.
Get a specialist to review your results — $45
Upload your ferritin, iron studies and thyroid results and get a written opinion from a PGIMER/AIIMS-trained specialist within 6 hours — what your numbers mean together and what to do. No referral needed.
Frequently asked questions
What is a normal ferritin level?
Many labs call ferritin “normal” above about 12–15 µg/L. But that lower end is often functionally insufficient — below 30 µg/L confirms iron deficiency, and many people feel best with ferritin in the 50–150 µg/L range, particularly with a thyroid condition.
Can low ferritin cause fatigue and hair loss even if I'm not anaemic?
Yes. Functional iron deficiency — low ferritin without frank anaemia — commonly causes fatigue, hair shedding and reduced exercise tolerance, and it impairs conversion of thyroid hormone. A ferritin of 20 can be labelled “normal” yet still be the cause of your symptoms.
Can Ginie Health review my ferritin and thyroid results?
Yes. A written opinion from a PGIMER/AIIMS-trained specialist costs $45 CAD, delivered within 6 hours, with no referral needed — useful for interpreting ferritin alongside your thyroid panel.