How long does crp test take

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Skip to main content. Health Information Library. Test Overview A C-reactive protein CRP test is a blood test that measures the amount of a protein called C-reactive protein in your blood. Find out if you have an increased chance of having a sudden heart problem, such as a heart attack. Identify and keep track of infections and diseases that cause inflammation, such as: Lymphoma cancer of the lymph nodes.

Giant cell arteritis painful swelling of the blood vessels in the head and neck. Rheumatoid arthritis painful swelling of the tissues that line the joint. Osteomyelitis infection of a bone. How To Prepare In general, there's nothing you have to do before this test, unless your doctor tells you to. How It Is Done A health professional uses a needle to take a blood sample, usually from the arm.

The injection site is cleaned with an alcohol swab before a needle is inserted into your vein. You may feel nothing at all from the needle, or you may feel a small brief sting or pinch. The blood sample is collected in a tube, which is sent to the laboratory for analysis.

In some cases, your doctor may perform a CRP test in their surgery. This is called a point-of-care CRP test. This is a finger-prick blood test where your doctor will gently prick and squeeze your finger for a small blood sample. The blood sample is collected in a tiny tube, which is analysed by a portable machine in the surgery.

The results of the point-of-care CRP test are available within a few minutes. On its own, a CRP test rarely provides a diagnosis, but it can confirm the presence of inflammation or infection. An increasing or high amount of CRP in your blood suggests acute inflammation or infection. As the inflammation or infection lessens, the CRP level drops.

The following links have more information on the CRP test. Be aware that websites from other countries may contain information that differs from New Zealand recommendations. The content on this page will be of most use to clinicians, such as nurses, doctors, pharmacists, specialists and other healthcare providers. When a patient is ill but the diagnosis is not known, the level of CRP may provide additional information to assist in reaching a diagnosis.

As the CRP levels rises significantly higher, more urgent review of the patient becomes necessary. CRP is not suitable as a screen in asymptomatic patients. It should only be requested on patients in whom the clinical evaluation has given some indication of a disease process.

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