Ferritin · low result
What does a low Ferritin mean?
Short answer
Low ferritin means depleted iron stores and is the earliest, most specific marker of iron deficiency — it falls before hemoglobin does. In menstruating women, heavy periods are the usual cause; in men and post-menopausal women, blood loss from the gut needs to be considered even when there are no symptoms. Diet, malabsorption (celiac disease) and frequent blood donation are other common causes.
Medically reviewed by Youmna DiStefano, MD · Last reviewed September 2026
When does this result need same-day care?
- Low ferritin with black or bloody stools, or with dizziness and a racing heart — see a clinician promptly
What is the normal range for Ferritin?
- Male, age 18+: 24.0 – 336 ng/mL
- Female, age 18+: 11.0 – 307 ng/mL
Strongly suggests iron deficiency, even before anemia develops. Common in menstruating women, vegetarians, and athletes.
Full reference table, citations and testing options: Ferritin biomarker page.
What are the common causes of low Ferritin?
- Heavy menstrual bleeding
- Gastrointestinal blood loss — ulcers, NSAIDs, polyps, celiac disease, colon lesions
- Low dietary iron (vegetarian/vegan diets, restricted eating)
- Malabsorption: celiac disease, bariatric surgery, acid-suppressing medication
- Pregnancy, endurance training, frequent blood donation
What symptoms go with low Ferritin?
- Fatigue and poor exercise tolerance
- Hair shedding, brittle nails
- Restless legs, ice craving
- Shortness of breath and pale skin if anemia develops
What do clinicians usually check next?
- CBC to see whether anemia is present yet
- Celiac screen if no obvious blood loss or dietary cause
- In men and post-menopausal women, a clinician typically evaluates the GI tract
- Recheck ferritin 8–12 weeks after starting iron replacement
Follow-up tests available at TestWell: CBC with Differential ($21.99), CBC (Complete Blood Count) ($21.99).
Ferritin refills slowly. When treating iron deficiency, hemoglobin usually improves within a few weeks, but ferritin needs roughly 3 months of consistent iron before a recheck can confirm stores have recovered (British Society of Gastroenterology guidance). Because ferritin also rises with inflammation, a result drawn during or just after an illness can read falsely reassuring — retest once you're well.
How do you recheck Ferritin?
Prices are cash-pay; every order adds one $6 lab processing fee. Physician authorization is included; no insurance or referral needed.
| Test or panel | Type | Price | Fasting | Results |
|---|---|---|---|---|
| Baseline Anemia Panel | Panel · 5 tests | $74.99 | Yes | 2–4 business days |
| Inflammation Panel | Panel · 7 tests | $119.99 | Yes | 2–5 business days |
| Post-COVID Recovery Panel | Panel · 7 tests | $99.99 | Yes | 2–4 business days |
| Ferritin | Test | $24.99 | No | 1–3 business days |
Common questions
What ferritin level is too low?
Below the lab's lower limit (commonly 11–30 ng/mL) is iron deficiency. Many clinicians consider levels under 30 ng/mL low when symptoms fit, and some target higher in athletes and people with hair loss or restless legs.
Can ferritin be low with a normal hemoglobin?
Yes — that's iron deficiency without anemia, the stage where treating it prevents anemia from developing.
Educational content, not a diagnosis. Lab results are one input; a clinician interprets them with your history and exam.