What Does A Blue Line Mean On A Pregnancy Test?

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Definition

The methylene blue test is used to determine the type of the blood disorder, methemoglobinemia.


How the test is performed

The health care provider wraps a tourniquet or blood pressure cuff around your upper arm. This creates pressure that causes veins below the area to fill with blood.

After cleaning the area with a germ killer (antiseptic), the person performing the test will place a needle into your vein, usually near the inside of the elbow or back of the hand. A thin...

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