Reading ferritin the way we read it
The number your doctor called fine is often the number behind your hair loss.
Ferritin is stored iron, and the lab range for it was built to catch anemia rather than to keep your hair. A reading in the teens is technically normal and functionally too low.
Ferritin is the number I get asked about least and think about most. It is your iron savings account, and almost everything your body treats as optional gets defunded when the balance runs down.
Hair is first in that queue. So is the energy you were counting on at four in the afternoon. Both of them go before a blood count shows anything at all, which is why so many people are told they are fine.
What ferritin actually measures
Most labs flag ferritin below about thirteen or fifteen. That threshold exists to catch iron deficiency anemia, which is a different and later problem than the one bringing you in.
A range built to catch disease is not the same as a range built for you to feel well. For hair specifically, the research and the clinic both point considerably higher than the bottom of that range.
“Your body defunds your hair long before it lets your blood count slip. That order is the whole point.
Your body defunds your hair long before it lets your blood count slip. That order is the whole point.
What we read next to it
When ferritin comes back low, or suspiciously mid-range, we read these alongside it:
Stored iron, and the number that tracks hair and afternoon energy most closely.
What is circulating right now and how well it is being carried around.
Rises when stores are genuinely low, which helps confirm what ferritin is telling us.
Inflammation lifts ferritin artificially. Without this, a low result can hide inside a normal one.
Tells us whether this has reached anemia or is still upstream of it.
Iron cannot be used without these. Repleting iron alone often stalls for this reason.
Read together, these tell us whether you are low, why you are low, and whether your body can absorb what we give you.
Why the lab range is not the target
Iron does not exist on its own. Absorbing it needs stomach acid, and using it needs copper, vitamin A, and B12 in the picture. Inflammation quietly raises ferritin at the same time, which can mask a real deficiency.
That is why a single number gets read alongside the rest rather than acted on by itself, and why we look at inflammation markers in the same draw. If your gut is part of the reason, the gut panel usually explains it.
Finding out why you are low
The other half of this is why. Heavy cycles, a vegetarian diet, low stomach acid, a gut that is not absorbing, or blood loss nobody has looked for. Iron deficiency is a symptom too.
Repleting without answering that question means doing it again in a year. We spend part of the consult on the cause, not just the correction.
What changes when we read it this way
When ferritin comes up, the order things return in is fairly consistent. Energy first, usually within weeks. Then the shedding slows. Then, months later, the regrowth you were actually hoping for.
That lag is worth knowing in advance, because month two feels like nothing is happening. Retesting at ninety days is what gets people through it, since the number moves before the mirror does.
Where to start
Ask for ferritin by name, and bring any old results you have. Three years of a slowly falling number tells us more than one reading in isolation ever could.
Then we sit down for half an hour, look at where you are and why, and decide whether this is oral iron, an IV, or a gut problem wearing an iron costume.
Where this connects
Dr. Nina reads the full panel, connects it to how you actually feel, and builds the plan from there. She sees patients in Atlanta and virtually worldwide.
More about Dr. Nina →Learn & Answers holds the short ones, answered in a sentence or two by Dr. Nina and the team.
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