Pain In Upper Left Arm And Muscle Cramps

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Anti-smooth muscle antibody is a blood test that detects the presence of antibodies against smooth muscle.

How the test is performed

Blood is drawn from a vein, usually from the inside of the elbow or the back of the hand. The site is cleaned with germ-killing medicine (antiseptic). The health care provider wraps an elastic band around the upper arm to apply pressure to the area and make the vein swell with blood.

Next, the health care provider gently inserts a needle into the vein. The...

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