What is a CRP test?

Aug 20, 2025 Source: Cainiu Health

Dr. Liu Feng

Introduction

Under normal circumstances, a CRP test, or C-reactive protein test, is a routine examination that measures the level of C-reactive protein in the blood by collecting a blood sample. It is primarily used to assist in determining whether there is inflammation, infection, or tissue damage in the body. In daily life, if symptoms such as fever, localized pain, redness, or swelling—suggestive of inflammation—occur, this test may be performed.

Generally, a CRP test, or C-reactive protein test, is a routine examination that measures the level of C-reactive protein in the blood by collecting a blood sample. It is primarily used to assist in determining whether there is inflammation, infection, or tissue damage in the body. Detailed analysis is as follows:

C-reactive protein is a protein synthesized by the human liver in response to inflammatory stimuli and is present in very low levels in the blood under normal conditions. When bacterial infection, trauma, or inflammatory diseases occur, its levels rapidly increase within hours, and the degree of elevation correlates with the severity of the inflammation. By quantitatively measuring this protein, the CRP test helps doctors preliminarily determine the type of inflammation and assess disease severity and treatment effectiveness. In daily life, if symptoms such as fever, localized pain, redness, or swelling-suggestive of inflammation-appear, or if monitoring the progression of chronic inflammatory diseases is needed, a CRP test can be performed in conjunction with a doctor's advice.

At the same time, maintaining regular sleep patterns, a balanced diet, and enhancing physical immunity can help reduce the occurrence of inflammation-related issues and maintain overall body stability.

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What does an elevated C-reactive protein indicate?

Elevated C-reactive protein (CRP) levels often indicate the presence of inflammation or infection in the body, with infections being a common cause. In bacterial infections such as pneumonia or urinary tract infections, CRP levels typically rise significantly within a short period, and the degree of elevation correlates with the severity of the infection. In viral infections, CRP elevation is usually mild, making it a useful reference for differentiating between types of infections.

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CRP greater than 40 mg/L indicates what type of infection?

Bacterial infection of the lungs triggers inflammation, stimulating the immune system to produce a large amount of CRP, accompanied by high fever, cough, expectoration of purulent sputum, and chest pain. Anti-infective treatment with Amoxicillin and Clavulanate Potassium Tablets, Ceftriaxone Sodium Injection, and Levofloxacin Injection should be administered as directed by a physician. Bacterial invasion of the renal pelvis and renal parenchyma leads to infection, with inflammation causing elevated CRP levels.

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What medications can be taken for high CRP?

Under normal circumstances, elevated CRP levels often indicate the presence of an inflammatory response in the body. Commonly used medications generally include Amoxicillin Capsules, Cefuroxime Axetil Tablets, Ibuprofen Sustained-Release Capsules, Prednisone Tablets, and Levofloxacin Tablets. The choice of medication should be based on the cause and type of inflammation. Amoxicillin Capsules belong to the penicillin class of antibiotics and are suitable for elevated CRP levels caused by bacterial infections.

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What does it mean if a child's CRP level is high?

In general, elevated CRP levels in children may be caused by factors such as intense physical activity, after vaccination, acute upper respiratory tract infection, acute bronchitis, or acute pyelonephritis. It is recommended to seek medical attention promptly, identify the underlying cause, and receive symptomatic treatment under a doctor's guidance. Daily care should ensure the child gets adequate rest, avoids excessive fatigue, and follows a light, easily digestible diet.