Creator: Superpower
Published: 2026-10-16

Measure your ferritin and iron stores

Ferritin read beside serum iron, TIBC, transferrin saturation, and hs-CRP in one draw

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What an at-home ferritin test measures

An at-home ferritin test kit measures ferritin from a few drops of finger-prick blood, no clinic visit needed. Rapid cassettes show only whether ferritin sits above or below one cutoff. Mail-in kits and phone-read cassettes return a measured number.

Ferritin is the protein your body uses to bind iron and keep it stored. A ferritin finger-prick test therefore shows how much iron you hold in reserve.

The result you get depends on the kit format.

Types of at-home ferritin tests

At-home ferritin tests come in three formats, plus an online-ordered lab draw that skips a doctor's visit. A phone-read strip can quantify ferritin from a drop of finger-prick blood within minutes.

Test format	Sample	Where it is read	Result you get	Main limit
Rapid visual cassette	Finger-prick drop	At home, by eye	Above or below a single cutoff	No exact level and no high reading
Smartphone-reader cassette	Finger-prick drop	At home, by phone app	A measured value	Single marker, with no inflammation context
Mail-in lab kit	Finger-prick sample mailed back	Certified lab	A lab number	Single marker unless the lab adds others
Online-ordered lab draw	Arm-vein sample	Lab, after a draw-site visit	A lab number	Needs a visit

So the choice is a one-line screen or a number you can track over time. Every format measures stored iron, not the iron circulating in your blood.

Ferritin vs serum iron

Ferritin reflects stored iron, while serum iron measures the iron moving through your blood.

Iron stores must run severely low before anemia appears, so low ferritin flags deficiency long before hemoglobin changes.

Serum iron is a less steady single reading. Iron in your blood varies through the day and can run higher in the morning.

Ferritin suits a single home reading, provided the kit reads it accurately.

How accurate at-home ferritin test kits are

At-home ferritin test kits screen well for low stores, within four limits:

Single cutoff: thresholds vary, and for people with anemia 45 ng/mL is recommended over 15 ng/mL.
Sample type: in one reader trial, finger-prick ferritin tracked venous lab results closely (R² = 0.86). Collection method accounted for 10% of the variability.
FDA status: a home test with no record in FDA's database may not be FDA-regulated.
No high reading: a single low cutoff cannot show high ferritin.

Even an accurate number can overstate stores when something pushes ferritin up.

How inflammation raises a ferritin result

Inflammation pushes ferritin up as an acute-phase reactant (a protein that rises with illness), so depleted iron stores can produce a normal-looking result.

Across 32 studies of apparently healthy people, inflammation raised ferritin by about 30%. Iron deficiency was underestimated by 14% as a result.

With inflammation markers raised, WHO's adult threshold for iron deficiency rises to under 70 ng/mL. Reading ferritin beside C-reactive protein (CRP), an inflammation marker, helps correct for that effect, while a home cassette measures ferritin alone.

Inflammation can move the number, so both ends of a ferritin result matter.

What your ferritin result means

Low ferritin usually means iron deficiency, while high ferritin more often reflects inflammation or illness than excess iron.

WHO sets adult iron deficiency at ferritin under 15 ng/mL, yet 30 ng/mL is now the most accepted cutoff. In non-pregnant women, iron-deficient red cell production begins at about 25 ng/mL.

Only about 10% of high results reflect iron overload. Other causes include liver disease, autoimmune disorders, and alcohol use disorder.

A lab's normal range describes where most people fall. Optimal is narrower, so a result near either edge still deserves a closer look.

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Get 100+ biomarkers tested in-lab or at home

One blood draw a year. A full picture of your health, explained in plain language.

Book your test

When to follow up with a full iron panel

A low or borderline home result calls for a full iron panel, as does a normal one alongside:

Symptoms: fatigue, weakness, dizziness, and shortness of breath.
Heavy periods: a major driver of iron deficiency.
Pregnancy: pregnant people more often run short of iron.
Vegetarian diet: vegetarians carry lower ferritin than non-vegetarians.
Blood donation: more donations, closer together, predict empty stores.
Student athletes: iron deficiency is common even without anemia.

A full panel adds serum iron, total iron-binding capacity (TIBC), and transferrin saturation to ferritin and hemoglobin. Transferrin saturation helps when inflammation props ferritin up.

Balance your ferritin levels with Superpower

A result from an at-home ferritin test kit reads more clearly beside an inflammation marker, and a comprehensive blood test reports both together. A Superpower membership includes 100+ biomarkers in a single draw, among them ferritin, serum iron, TIBC, transferrin saturation, hemoglobin, and hs-CRP. As your home for health, Superpower keeps those results together and helps you improve them with a personalized plan.

It's time to take control of your health. Start your Superpower membership and get your baseline in one draw.