You sleep eight hours and still wake up tired. You need a nap by 3 p.m. Your hair seems thinner, your legs feel heavy on the stairs, and you get cold more easily than your friends. Your doctor ran a blood count years ago and said it was “fine.”
If that sounds familiar, there’s news worth knowing. In 2026, the American Society of Hematology raised the bar for diagnosing iron deficiency. That means some women who were told they were fine may actually have low ferritin. This guide explains what changed, what to ask your doctor, and where an iron infusion fits.
Table of Contents
What Ferritin Is
Ferritin is a protein that stores iron in your body. A ferritin blood test shows roughly how much iron you have saved up.
Think of it like a savings account. Hemoglobin, which is checked in a regular blood count, is like the cash in your wallet. You can have enough cash today while your savings run dry. Low ferritin can show up before anemia does.
What the New Guidelines Changed
The American Society of Hematology (ASH) released new guidelines for diagnosing iron deficiency in 2026. The key changes:
- For people who menstruate, a ferritin of 30 ng/mL or less suggests iron deficiency.
- In some cases, such as heavy bleeding, symptoms, or pregnancy-related anemia, a cutoff of 50 ng/mL or less may be used.
Many labs have used much lower cutoffs in the past. So a result once marked “normal” might now be read as low ferritin. That’s a big deal for women who’ve felt tired for years without an answer.
Why it’s getting more attention
IV iron use has been climbing too. A study from Flinders University in Australia reported in August 2026 that about 1 in 20 women of reproductive age there received IV iron in 2024, up from 0.3% in 2013. That’s a sign of how common low iron is, and how much more often doctors are looking for it.
Common Signs of Low Ferritin
Low iron can show up in quiet ways:
- Tiredness that sleep doesn’t fix
- Shortness of breath on stairs
- Feeling cold, especially hands and feet
- Hair shedding
- Brittle nails
- Headaches
- Restless legs at night
- Craving ice
These signs can have many causes, like thyroid problems, poor sleep, or depression. That’s why a blood test matters more than a symptom checklist.
Who Is More Likely to Have Low Ferritin
- Women with heavy periods
- People who are pregnant or recently gave birth
- People who eat little or no meat
- Frequent blood donors
- Endurance athletes
- People on GLP-1 weight loss medicines, who may eat less iron-rich food. Our guide to GLP-1 vitamin labs covers this.
- People with stomach or gut conditions that affect absorption
Labs to Ask Your Doctor About
If you’re tired all the time, ask your doctor about:
- Ferritin, to check your iron stores
- Complete blood count (CBC), to check for anemia
- Iron and transferrin saturation, for a fuller picture
- Thyroid tests, since thyroid problems also cause fatigue
- Vitamin B12 and vitamin D, if your doctor thinks they fit
Bring this list to your next visit. And if your result was “normal” before, it’s fair to ask what the number actually was.
Finding the cause
Low ferritin is a sign, not a diagnosis by itself. Your doctor will want to know why it’s low. Heavy periods are a common reason, but there are others, and some need their own care. Don’t skip that step.
Treatment Usually Starts With Food and Pills
For many people, the first step is oral iron, along with iron-rich foods. Oral iron is often taken every other day, since some research suggests this may help absorption. Your doctor will tell you what’s right for you.
Foods with iron include red meat, poultry, fish, beans, lentils, spinach, and fortified cereals. Eating vitamin C foods, like oranges or peppers, with iron-rich foods can help your body absorb it. Coffee and tea can do the opposite, so try to have them between meals.
Iron Infusion: When Labs Say It Fits
An iron infusion gives iron directly through an IV. Doctors generally consider it when:
- Oral iron hasn’t worked after a fair try
- Oral iron causes side effects you can’t tolerate, like stomach upset or constipation
- Iron needs to be replaced more quickly
- Your gut doesn’t absorb iron well
At our physician-led practice in Greenacres, we offer an Iron Infusion only for people whose blood work shows low iron, and only when labs and your clinician say it fits. It isn’t a general energy drip, and it isn’t for everyone who feels tired.
What to know about iron infusions
- You’ll be screened first, including your labs, history, and medicines.
- Someone watches you during the infusion, since reactions can happen.
- It’s a medical treatment, so follow-up labs matter.
If your ferritin is normal and you still feel tired, an iron infusion isn’t the answer. Our guide to IV therapy for energy covers other options and their limits.
Frequently Asked Questions
What is a normal ferritin level?
It depends on the lab and the person. The 2026 ASH guidelines say a ferritin of 30 ng/mL or less suggests iron deficiency in people who menstruate, and 50 or less may be used in some cases.
Can low ferritin make you tired?
Yes, low iron can cause tiredness, even before anemia shows up. But fatigue has many causes, so testing matters.
Should I get an iron infusion if I’m tired?
Only if your blood work shows low iron and your clinician recommends it. Oral iron is often tried first.
How long does it take to feel better after starting iron?
It varies. Your doctor will usually recheck your labs after a few weeks to months to see how your levels respond.
Can I take iron without testing?
It’s better not to. Too much iron can be harmful, and testing helps find the real cause of your symptoms.
Get Your Numbers First
Being tired all the time isn’t something you should just accept. Ask about your ferritin, get the full picture, and then decide. If your labs point to low iron, book a consultation and bring your results.
Book a private consultation or call (561) 363-5538.
Majestic Aesthetics · 5315 Lake Worth Road, Greenacres, FL 33463 · (561) 363-5538
This article is general education, not medical advice. Individual results vary. Consultation required. Not all patients are candidates.
Want to keep reading? Find more plain-English guides on our blog, or start with our IV therapy overview.
Related reading: IV Therapy for Energy: What It May Help and What It Won’t · On a GLP-1? The Vitamin D, B12, and Iron Labs Worth Asking About
