Search all medical codes

C-reactive protein

CPT4 code

Name of the Procedure:

C-reactive Protein Test (CRP Test)


The C-reactive Protein (CRP) test is a simple blood test that measures the level of CRP, a substance produced by the liver in response to inflammation. Elevated CRP levels can indicate acute inflammation, infections, or chronic inflammatory conditions.


The CRP test helps in diagnosing and monitoring inflammatory diseases such as rheumatoid arthritis, lupus, and infections. It also aids in assessing the risk of heart disease.


  • Symptoms of infection (e.g., fever, chills)
  • Diagnosing and monitoring autoimmune diseases (e.g., rheumatoid arthritis, lupus)
  • Evaluating the risk of cardiovascular diseases
  • Monitoring treatment effectiveness for inflammatory conditions


  • No special preparation is generally required.
  • Inform your healthcare provider about any medications you are taking, as some may affect CRP levels.
  • Fasting is not typically necessary unless specified by your healthcare provider.

Procedure Description

  1. The healthcare provider will clean the area on your arm where blood will be drawn.
  2. An elastic band is tied around the upper arm to fill veins with blood.
  3. A needle is inserted into a vein, usually in the arm, to collect blood into a tube.
  4. The elastic band is removed, and the needle is taken out once the blood collection is complete.
  5. A bandage or gauze is applied to stop any bleeding.


The procedure takes about 5-10 minutes.


The procedure is performed in a doctor's office, hospital, or outpatient clinic.


  • Trained phlebotomist or nurse
  • Sometimes a lab technician is involved in analyzing the blood sample

Risks and Complications

  • Minor discomfort or pain at the needle insertion site
  • Slight bruising or bleeding
  • Rarely, infection at the puncture site


  • Quick and minimally invasive way to detect inflammation
  • Helps guide diagnosis and treatment
  • Can be used to monitor disease progression and response to treatments


  • No significant recovery time is needed.
  • Patients can resume normal activities immediately.
  • Keep the puncture site clean and dry.


  • Erythrocyte Sedimentation Rate (ESR) test: Another blood test that measures inflammation.
  • Imaging studies (e.g., X-rays, MRIs) to look for signs of inflammation in specific areas.

Patient Experience

  • You may feel a quick pinch when the needle is inserted.
  • Some minor discomfort or bruising at the site of blood draw.
  • Usually, minimal to no pain after the procedure.
  • Drink plenty of fluids and follow any specific instructions provided by your healthcare provider.