A Normal Hemoglobin Result Does Not Complete an RLS Iron Review
Sleep & NighttimeArticleAsk about iron studies for assessed restless legs syndrome, even when anemia was not found.
In this article
A normal hemoglobin result does not settle the iron question in restless legs syndrome, or RLS. The AASM’s 2015 quality measures explicitly say hemoglobin and hematocrit alone are insufficient to assess iron status: iron deficiency can contribute to RLS without coexisting anemia.1
The mistaken assumption
“I wasn’t anemic, so the iron review must be complete.”
That shortcut treats a hemoglobin result as the whole iron assessment. The question to raise is whether your clinician has reviewed the iron studies relevant to RLS and what those findings mean for your care.
What the guidance checks instead
The AASM’s January 2025 guideline recommends regular iron studies for clinically significant RLS, including ferritin and transferrin saturation. Its good practice statement is based on expert consensus. The results help clinicians decide whether iron treatment is appropriate and which approach to consider.2
Ask which studies you already had and whether the clinician needs anything further. Keep the laboratory units and comments attached to the results. If you only have a message saying “normal,” request the report or an explanation of which findings that message refers to.
Ferritin also rises with inflammation, so its interpretation can need the wider iron panel and clinical context. A single value is not a self-treatment instruction.1
What this correction does not establish
RLS is assessed through a careful clinical history; several conditions can resemble it. An iron result alone does not diagnose RLS, and this article concerns the iron review alongside a clinical assessment.2
Describe the symptoms that remain troublesome and the effect on your nights. If the clinician has given you a different explanation, ask how the proposed tests relate to that assessment. You do not need to decide the diagnosis before asking for clarification.
Get the sample and follow-up plan from the team
The guideline gives specific preparation advice for iron studies. Ask the ordering team for your own instructions, including how to handle any iron-containing products you use. Do not pause a prescribed treatment or improvise supplement use from a general guideline.2
Bring the names and labels of your medicines and supplements. Ask who will explain the results, when that conversation should happen and what instructions to follow meanwhile. Keep the agreed contact details with the plan so an unanswered result does not become another night of searching.
Did I Do That in My Sleep? includes a 14-Night Lights-Out Record and a Visit Brief. Use them to organize nighttime observations and questions alongside the clinician’s testing instructions. Explore the sleep playbook.
This article is for general educational purposes only and is not medical advice. It isn't a substitute for diagnosis or treatment from a qualified healthcare professional who knows your health history. Please don't ignore professional advice or delay getting care because of something you read here. If you think you may be having a medical emergency, call 911 or your local emergency number right away. Girl Playbook does not endorse any specific product, test, or provider.
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Sources
The research behind this article, in the order it’s cited. How we source our articles.
- American Academy of Sleep Medicine, 2015Quality Measures for the Care of Adult Patients with Restless Legs Syndrome (opens in a new tab)ab
- American Academy of Sleep Medicine / International Restless Legs Syndrome Study Group, 2025Treatment of restless legs syndrome and periodic limb movement disorder: clinical practice guideline (opens in a new tab)abc
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