During the procedure
Blood is drawn from a vein, usually from your arm. Before the needle is inserted, an elastic band around your upper arm causes the veins in that arm to fill with blood, and the puncture site is cleaned with antiseptic.
After the needle is inserted, a small amount of blood is collected into a vial or syringe. The band is then removed to restore circulation, and blood continues to flow into the vial. Once enough blood is collected, the needle is removed and the puncture site is covered with a pressure wrap.
This relatively painless procedure usually takes only a few minutes.
After the procedure
After your CRP test, you should be able to drive yourself home and do your normal activities.
It can take a few days to get your results. Your doctor should explain to you what the results of your test mean.
If you're having an hs-CRP test is to help find out your heart disease risk, remember that your CRP level is only one risk factor for coronary artery disease. If you have a high CRP level, it doesn't necessarily mean you're at a higher risk of developing heart disease.
Talk to your doctor about your other risk factors and ways you can try to prevent coronary artery disease and a heart attack.
Nov. 21, 2017
- Goff DC Jr., et al. 2013 ACC/AHA guideline for assessment of cardiovascular risk: A report of the American College of Cardiology/American Heart Association Task Force on Practice Guidelines. Circulation. 2014;129:S49.
- Filippo C, et al. C-reactive protein in cardiovascular disease. https://www.uptodate.com/contents/search. Accessed Oct. 16, 2017.
- Morrow DA. Screening for cardiovascular disease with C-reactive protein. https://www.uptodate.com/contents/search. Accessed Oct. 16, 2017.
- WHO guidelines on drawing blood: Best practices in phlebotomy. World Health Organization. http://www.who.int/infection-prevention/publications/drawing_blood_best/en/. Accessed Oct. 16, 2017.
- Fischbach FT, et al. Immunodiagnostic studies. In: A Manual of Laboratory and Diagnostic Tests. 9th ed. Philadelphia, Pa.: Lippincott Williams & Wilkins; 2014.
- C-reactive protein, high sensitivity, serum. Mayo Medical Laboratories. https://www.mayomedicallaboratories.com/test-catalog/Clinical+and+Interpretive/82047. Accessed Nov. 16, 2017.