CRP (C-Reactive Protein) Test

C-reactive protein, or CRP, is made by the liver and rises in the bloodstream when the body responds to inflammation. Inflammation is a normal part of how the body reacts to many things — infection, injury, and a range of other processes — so CRP is considered a broad, nonspecific marker. It tells a clinician that inflammation may be present, but not where it is coming from or why.

The CRP test is done with a simple blood draw at a patient service center. A phlebotomist collects a sample from a vein, usually in the arm, and the sample goes to the laboratory. No special preparation is typically needed, though people follow any instructions their ordering clinician provides. Results are read by a clinician in the context of symptoms, history, and any other markers ordered alongside it.

People who order a CRP test are often looking into symptoms that can be linked to inflammation, or following up on a broader evaluation a clinician has suggested. Because it is a general marker, it comes up in many different situations rather than pointing to any single one. Some people include it as part of a wider workup, while others test it because a clinician wanted a general read on inflammation. A high-sensitivity version of the test is sometimes used in cardiovascular risk conversations, where clinicians consider low-level inflammation as one input among several.

CRP reflects the presence of inflammation in a general way. When the body mounts an inflammatory response, the liver releases more C-reactive protein, and the test picks up that change in the blood. Because so many processes can drive inflammation, CRP describes that something may be happening without identifying the cause.

It also helps to remember what CRP is not: it is not specific to any one organ or condition. That is exactly why a clinician reads it alongside symptoms and other tests rather than on its own, and why a single result is treated as one piece of a larger picture.

CRP is frequently ordered as part of a broader evaluation rather than in isolation. Depending on what a clinician is exploring, it may be paired with other blood work to add context. In cardiovascular risk conversations, a high-sensitivity CRP measurement is sometimes considered alongside lipid markers, since low-level inflammation is one factor clinicians weigh. Read together, these results offer more context than any single marker can on its own.

No appointment is needed. People can walk into a patient service center during open hours, and the draw itself is quick — a phlebotomist collects a small sample from a vein in the arm, and most visits wrap up in a few minutes. Once the laboratory completes its analysis, results are posted to the account, where they can be reviewed and shared with a clinician.

Results will be emailed securely to you as a PDF.