C-reactive protein (CRP) by nephelometry (serum/plasma)

Why CRP Matters in Health

CRP is a marker for inflammation, a natural response to injury, infection, or illness. While CRP levels rise with acute infections (like pneumonia), they can also signal chronic inflammation that may contribute to conditions like heart disease, arthritis, or metabolic disorders. High levels may prompt further evaluation to understand underlying causes.

When This Test Is Ordered

Your doctor might order a high-sensitivity CRP test to monitor long-term inflammation, check for signs of heart disease risk, evaluate autoimmune conditions, or assess response to treatments. It’s often used alongside other tests, such as cholesterol or blood sugar levels.

What to Expect Before the Test

No special preparation is needed for this test. You’ll have a small needle inserted into your arm or vein to draw blood. If you’re concerned about needles, let your healthcare provider know—they can offer alternatives.

What the Results Mean

Results are reported in milligrams per liter (mg/L). While reference ranges vary by lab, higher-than-normal levels may indicate inflammation, while very low levels might suggest reduced immune response. Your doctor will interpret results in the context of your overall health and symptoms.