C-Reactive Protein (CRP) Test — Purpose, Normal Range & Price

A C-Reactive Protein (CRP) test is a blood test that measures the level of CRP, a protein produced by the liver in response to inflammation in the body. Under normal conditions, CRP is present in the blood in very small amounts. When the body experiences infection, injury, or any inflammatory condition, the liver rapidly increases CRP production and its levels in the blood rise significantly within a few hours. CRP is one of the most sensitive and reliable markers of acute inflammation and infection available in routine blood testing. It is widely used by doctors across India to detect the presence and severity of inflammation, monitor the progression of an infection or inflammatory disease, and evaluate the response to treatment. Because CRP levels rise and fall quickly in response to the body's condition, it is a highly useful real-time indicator of what is happening inside the body. The test involves a simple blood draw from a vein in the arm and is completed in under five minutes.

Doctors prescribe a CRP test in a wide range of clinical situations. The most common reasons include: Detecting the presence of an active bacterial or viral infection when a patient presents with fever, pain, or generalised weakness and the cause is not immediately clear. Monitoring the severity and progression of infections such as pneumonia, sepsis, urinary tract infections, and post-surgical infections, all of which are frequently encountered in Indian hospitals. Diagnosing and monitoring inflammatory conditions such as rheumatoid arthritis, lupus, inflammatory bowel disease, and vasculitis, where CRP serves as a key marker of disease activity. Evaluating the effectiveness of antibiotic or anti-inflammatory treatment. A falling CRP level confirms that the body is responding positively to treatment. Assessing cardiovascular risk when a high-sensitivity CRP test, known as hs-CRP, is ordered. Chronically elevated low-grade inflammation is associated with an increased risk of heart disease and stroke. Post-operative monitoring to detect early signs of infection or complications after surgery. Screening in the context of COVID-19 and other viral infections, where CRP levels help assess the severity of the inflammatory response and guide treatment decisions.

The CRP test measures the concentration of C-Reactive Protein in the blood, reported in milligrams per litre (mg/L). There are two types of CRP tests available depending on what the doctor is investigating. Standard CRP Test The standard CRP test is used to detect and monitor significant inflammation or active infection. It measures CRP across a broad range and is the test prescribed when a doctor suspects an acute infection, inflammatory disease, or post-operative complication. A normal CRP level in a healthy individual is typically below 10 mg/L. Values above this indicate the presence of inflammation or infection, with higher values generally corresponding to more severe conditions. High Sensitivity CRP Test (hs-CRP) The high sensitivity CRP test measures very low levels of CRP in the blood and is used primarily to assess the risk of cardiovascular disease. It detects chronic low-grade inflammation that standard CRP tests may miss. An hs-CRP value below 1 mg/L indicates low cardiovascular risk. A value between 1 and 3 mg/L indicates moderate risk. A value above 3 mg/L indicates high cardiovascular risk and warrants further evaluation by a cardiologist. Your doctor will specify which type of CRP test is required based on your clinical condition.

Preparation for a CRP test is straightforward. Fasting is not required for a standalone CRP test. You can eat and drink normally before sample collection. If CRP is part of a larger panel that includes fasting tests such as blood sugar or lipid profile, fast for 8 to 10 hours as advised. Our team confirms preparation requirements at the time of booking. Stay normally hydrated before the test. Drinking water normally before sample collection is recommended. Inform the phlebotomist about all medications you are currently taking. Certain medications such as statins, NSAIDs, and corticosteroids can affect CRP levels and your doctor may factor this into the interpretation of your report. Avoid strenuous exercise for 24 hours before the test. Intense physical activity can temporarily elevate CRP levels and affect the accuracy of the result. There are no food restrictions specific to the CRP test beyond the fasting guidance above.

If you are booking through the SecondMedic platform the CRP test price starts at approximately Rs. 470. The exact price will be confirmed at the time of booking through SecondMedic. If your doctor has prescribed multiple tests alongside CRP, SecondMedic health packages include CRP as part of a broader inflammation and infection panel at a significantly lower combined price.

SecondMedic provides home sample collection for CRP test across all major areas of India. You do not need to visit a lab or collection centre. A certified and trained phlebotomist comes to your home or workplace at your chosen time, collects the sample using sterile single-use equipment, and ensures it is transported to the NABL-accredited lab within the required time window for accurate processing. Please note that SecondMedic provides free home sample collection on all tests priced above Rs. 300. Our team will check your pincode and confirm if your address falls under our free sample collection eligibility criteria, which depends upon the lab location and phlebotomist availability. Home collection is available between 7 AM and 10 PM, seven days a week, including Sundays and public holidays. Enter your pincode on the booking page or call our helpline to confirm availability at your address.