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Cholesterol Tests (cont.)

Risks

There is little risk associated with blood tests Bruising at the site where the blood was drawn may occur. This occurs normally any time a vein is damaged. People who are taking blood thinners such as warfarin (Coumadin), clopidogrel (Plavix), or prasugrel (Effient) may need to hold extra pressure at the puncture site to allow the bleeding to stop.

Rarely, an infection may occur. This may present with pain, rednesss, swelling, and streaking up the arm towards the armpit.

Some people may feel lightheaded during or after having a blood sample taken. This is due to a vasovagal reaction, or near faint, in which the heart rate slows and blood vessels dilate (due to stimulation of the vagus nerve). This passes very quickly and is usually treated by lying down and resting for a few minutes.

Medically Reviewed by a Doctor on 7/22/2014

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