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    Methylene blue test

    The methylene blue test is a test to determine the type ofmethemoglobinemia(a blood disorder).

    How the Test is Performed

    The health care provider wraps a tight band or blood pressure cuff around your upper arm. The pressurecauses veins below the area to fill with blood.

    The arm is cleaned with agerm killer (antiseptic). Aneedle 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.

    A dark green powder called methylene blue goes through the tube into your vein. The health care provider looks at how the powder turns a substance in the blood called methemoglobin into normal hemoglobin.

    How to Prepare for the Test

    No special preparation is required for this test.

    How the Test Will Feel

    When the needle is inserted, you may feel some pain or a stinging feeling. Afterward, there may be some throbbing.

    Why the Test is Performed

    There are several types of oxygen-carrying proteins in the blood. One of them is methemoglobin. Normal methemoglobin levels in blood are usually around 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.

    Methemoglobinemia has several causes, many of which are genetic. This test is used to tell the difference between methemoglobinemia caused by the lack of a protein called cytochrome b5 reductase and other types that are passed down through families (inherited). Your doctor will use the results of this test to help determine your treatment.

    Normal Results

    Normally, methylene blue rapidly lowers the levels of methemoglobin in the blood.

    Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.

    What Abnormal Results Mean

    You may have a rare form ofmethomoglobinemia if this testdoes not significantly lower blood levels of methemoglobin.

    Risks

    Veins and arteries vary in size from one patient 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.

    Other risks associated with this type of blood test are minor, but may include:

    • Excessive bleeding
    • Fainting or feeling light-headed
    • Hematoma (blood accumulating under the skin)
    • Infection (a slight risk any time the skin is broken, but the chances of infection increase the longer the IV remains in the vein)

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              Tests for Methylene blue test

              Review Date: 11/2/2012

              Reviewed By: Chad Haldeman-Englert, MD, FACMG, Wake Forest School of Medicine, Department of Pediatrics, Section on Medical Genetics, Winston-Salem, NC. Review provided by VeriMed Healthcare Network. Also reviewed by A.D.A.M. Health Solutions, Ebix, Inc., Editorial Team: David Zieve, MD, MHA, David R. Eltz, and Stephanie Slon.

              The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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              St. Luke's Hospital - 232 South Woods Mill Road - Chesterfield, MO 63017 Main Number: 314-434-1500 Emergency Dept: 314-205-6990 Patient Billing: 888-924-9200
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