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<article><div id="d-article"><div class="page-info"><div class="page-title"><a name="start" id="start">
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</a><h1 class="with-also" itemprop="name">Methylene blue test</h1>
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</noscript></div><div class="main"><div id="ency_summary"><p>The methylene blue test is a test to determine the type or to treat <a test="test" href="./000562.htm">methemoglobinemia</a>, a blood disorder. </p></div><section><div class="section"><div class="section-header"><div class="section-title"><h2>How the Test is Performed</h2></div><div class="section-button"><button type="submit" aria-controls="section-1" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-1"><p>The health care provider wraps a tight band or blood pressure cuff around your upper arm. The pressure causes veins below the area to fill with blood.</p><p>The arm is cleaned with a germ killer (antiseptic). A needle is placed into your vein, usually near the inside of the elbow or back of the hand. A thin tube, called a catheter, is placed into the vein. (This may be called an IV, which means intravenous). While the tube stays in place, the needle and tourniquet are removed.</p><p>A dark green powder called methylene blue goes through the tube into your vein. The provider looks at how the powder turns a substance in the blood called <a test="test" href="./003371.htm">methemoglobin</a> into normal <a test="test" href="./003645.htm">hemoglobin</a>.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>How to Prepare for the Test</h2></div><div class="section-button"><button type="submit" aria-controls="section-2" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-2"><p>No special preparation is required for this test.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>How the Test will Feel</h2></div><div class="section-button"><button type="submit" aria-controls="section-3" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-3"><p>When the needle is inserted to draw blood, some people feel moderate pain. Others feel only a prick or stinging. Afterward, there may be some throbbing or slight bruising. This soon goes away.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Why the Test is Performed</h2></div><div class="section-button"><button type="submit" aria-controls="section-4" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-4"><p>There are several types of oxygen-carrying proteins in the blood. One of them is methemoglobin. Normal methemoglobin levels in blood are usually 1%. If the level is higher, you can become sick because the protein is not carrying oxygen. This can make your blood look brown instead of red. </p><p>Methemoglobinemia has several causes, many of which are genetic (problem with your genes). This test is used to tell the difference between methemoglobinemia caused by the lack of a protein called <a test="test" href="./002315.htm">cytochrome b5 reductase</a> and other types that are passed down through families (inherited). Your doctor will use the results of this test to help determine your treatment.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Normal Results</h2></div><div class="section-button"><button type="submit" aria-controls="section-5" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-5"><p>Normally, methylene blue quickly lowers the level of methemoglobin in the blood.</p><p>Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or test different samples. Talk to your provider about the meaning of your specific test results.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>What Abnormal Results Mean</h2></div><div class="section-button"><button type="submit" aria-controls="section-6" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-6"><p>You may have a rare form of methemoglobinemia if this test does not significantly lower the blood level of methemoglobin.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Risks</h2></div><div class="section-button"><button type="submit" aria-controls="section-7" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-7"><p>There is little risk involved with having your blood taken. Veins and arteries vary in size from one person to another and from one side of the body to the other. Inserting an IV may be more difficult for you or your child than for other people.</p><p>Other risks associated with this type of blood test are minor, but may include:</p><ul><li>Excessive bleeding</li><li>Fainting or feeling lightheaded</li><li>Multiple punctures to locate veins</li><li>Hematoma (blood accumulating under the skin causing bruising)</li><li>Infection (a slight risk any time the skin is broken, but the chances of infection increase the longer the IV remains in the vein) </li></ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Alternative Names</h2></div><div class="section-button"><button type="submit" aria-controls="section-Alt" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-Alt"><p>Methemoglobinemia - methylene blue test</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>References</h2></div><div class="section-button"><button type="submit" aria-controls="section-Ref" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-Ref"><p>Chernecky CC, Berger BJ. Methemoglobin - blood. In: Chernecky CC, Berger BJ, eds. <em>Laboratory Tests and Diagnostic Procedures</em>. 6th ed. St Louis, MO: Elsevier Saunders; 2013:781-782.</p><p>Neerja V, Graham S, Bem S. Basic examination of blood and bone marrow. In: McPherson RA, Pincus MR, eds. <em>Henry's Clinical Diagnosis and Management by Laboratory Methods</em>. 24th ed. Philadelphia, PA: Elsevier; 2022:chap 31.</p></div></div></section>
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<section><div class="section"><div class="section-header"><div class="section-title"><h2>Review Date 10/13/2022</h2></div><div class="section-button"><button type="submit" aria-controls="section-version" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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<div id="section-version" class="section-body"><p>Updated by: Anna C. Edens Hurst, MD, MS, Associate Professor in Medical Genetics, The University of Alabama at Birmingham, Birmingham, AL. Review provided by VeriMed Healthcare Network. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.</p>
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