--- title: "New Iron Deficiency Guidelines: Why Your \"Normal\" Ferritin May Not Be Normal" description: "New ASH guidelines have raised ferritin cutoffs for iron deficiency. If your labs were \"normal\" but you still feel exhausted, your iron might actually be low." canonical: https://glpeak.ai/blog/new-iron-deficiency-guidelines-why-your-normal-ferritin-may-not-be-normal author: GLPeak Team published: 2026-09-22T15:00:00.812+00:00 --- # New Iron Deficiency Guidelines: Why Your "Normal" Ferritin May Not Be Normal _By GLPeak Team · 2026-09-22_ **New ASH guidelines have raised ferritin cutoffs for iron deficiency. If your labs were "normal" but you still feel exhausted, your iron might actually be low.** On September 16, 2026, the American Society of Hematology put out new guidelines for diagnosing iron deficiency. The big change is that the ferritin cutoffs went up across the board. That's a bigger deal than it sounds. Higher cutoffs mean a lot of people whose labs came back unflagged may now actually qualify as iron deficient, especially anyone whose number was sitting close to the old line. If you've been told your iron is fine and you're still dragging, you’re probably not imaging it. ## The New Numbers Here's what now counts as iron deficiency: - Children 9 months to 4 years: ferritin 20 ng/mL or lower  - Adults, including menstruating and pregnant people: 30 ng/mL or lower  - Higher-risk groups, including heavy periods and pregnancy with anemia: 50 ng/mL or lower  - Adults with inflammation, including cancer, inflammatory bowel disease, or an infection: ferritin under 100 ng/mL, or transferrin saturation under 20% ASH says the guidelines exist to fix problems that have been around a long time, mainly that testing practices vary, thresholds have been inconsistent, and some cases are just genuinely hard to spot. ## Normal Blood Work Doesn't Rule It Out Iron deficiency and iron deficiency anemia get talked about like they're the same thing. They're not, and the difference matters. Iron deficiency comes first. Your stores run down and symptoms can show up while your hemoglobin still looks perfectly fine. Anemia is what happens later, once you've been depleted long enough that it starts affecting red blood cell production. A standard blood count picks up the second part. It can look totally normal during the first. Your body needs iron for hemoglobin, and also for enzymes involved in energy production and for your brain, immune system, muscles, skin, hair, and nails. When stores get low, you might notice fatigue, weakness, dizziness, trouble concentrating, shortness of breath, a racing heart, headaches, or pale skin. Restless legs and hair shedding are also linked to low iron. If you want to know your iron status, ferritin has to be ordered specifically. A CBC won't answer the question. ## Why This Comes Up on a GLP-1 The reasoning here is pretty simple. You get iron from food, and appetite suppression means less food. Red meat is one of the best-absorbed sources of iron, and it's also something a lot of people lose interest in on these medications. Less food overall plus less of the iron-rich stuff, stretched over months, adds up. There's also the hair connection. Low ferritin is a known contributor to hair loss, a commonly reported GLP-1 symptom. If you're dealing with fatigue and hair changes at the same time, that's two reasons to get the number checked instead of one. ## Some Hematologists Say 30 Is Still Too Low The new guidelines are a real improvement over what most labs have been using. They're also not the last word. That same 2023 review argued the physiologic cutoff is closer to 50 ng/mL than 30, pointing to iron absorption studies and trials on fatigue. Some clinicians aim even higher, above 75, when someone has hair loss or restless legs. The difference is in what kind of evidence each one rests on. ASH's numbers came out of a formal guideline process with systematic evidence review. The higher targets come from expert argument and smaller studies. Practically, it means a ferritin of 35 clears the new cutoff on paper and can still be worth a conversation if you feel terrible. ## A Low Number Is the Start, Not the Answer If your ferritin comes back low, the next question is why. It could be diet. It could be heavy periods. It could be malabsorption from something like celiac disease, or bleeding somewhere in your GI tract, including from colon cancer. Iron deficiency in a postmenopausal woman or in a man especially needs an explanation, not just a supplement. Taking iron can fix the lab value while leaving whatever caused it sitting there untouched. Too much iron is also a problem for people who aren't deficient, which is the other reason to test before you start supplementing rather than after. ASH says treatment guidelines are coming in 2027. For now, at least the diagnostic side is becoming clearer. * * * _References:_ _1\. American Society of Hematology. ASH Sets New Standards for Diagnosing Iron Deficiency. September 16, 2026._ [_https://www.hematology.org/newsroom/press-releases/2026/ash-sets-new-standards-for-diagnosing-iron-deficiency_](https://www.hematology.org/newsroom/press-releases/2026/ash-sets-new-standards-for-diagnosing-iron-deficiency) _2\. ASH clinical practice guidelines on the diagnosis of iron deficiency. Blood Advances. 2026. doi:10.1182/bloodadvances.2025015950._ [_https://doi.org/10.1182/bloodadvances.2025015950_](https://doi.org/10.1182/bloodadvances.2025015950) _3\. Martens K, DeLoughery TG. Sex, lies, and iron deficiency: a call to change ferritin reference ranges. Hematology Am Soc Hematol Educ Program. 2023;2023(1):617-621. doi:10.1182/hematology.2023000494._ [_https://pubmed.ncbi.nlm.nih.gov/38066931/_](https://pubmed.ncbi.nlm.nih.gov/38066931/) _This blog is for informational purposes only and does not constitute medical advice. Don't start iron supplements without testing and a conversation with your provider, since too much iron is harmful if you're not actually deficient._