hs-CRP (High-Sensitivity C-Reactive Protein)

What hs-CRP Measures

CRP is an acute-phase protein. The liver makes it, mainly on a signal from the inflammatory messenger interleukin-6, and blood levels can climb as much as a thousand-fold at sites of infection or inflammation.^[1],[2]

The honest caveat is that CRP is non-specific. It rises with bacterial and viral infections, injuries, autoimmune conditions, and many other acute and chronic states.^[1] The result tells you how much inflammation you have, not what's causing it or where it is.^[3] It's a marker that inflammation exists somewhere, not a diagnosis of anything.

How It's Measured

Both CRP and hs-CRP come from a standard venous blood draw. The difference is the assay, not the protein. A standard CRP test picks up the larger elevations that come with acute inflammation, while a high-sensitivity assay precisely measures the very small amounts of CRP that circulate the rest of the time.^[1],[3] The "high-sensitivity" label describes the lab technique, nothing more.^[1] hs-CRP shows up on inflammation panels and in cardiovascular research, where a joint CDC and American Heart Association statement covers its use as an inflammatory marker.^[4]

Why People Track hs-CRP

Inflammation isn't a fixed background level, and in people who menstruate it moves with the cycle itself. The BioCycle Study measured CRP repeatedly across the cycles of 259 women and found levels varied significantly by phase, with higher values around menstruation and lower CRP when estradiol was high.^[5] A single hs-CRP number is a snapshot of that moving picture. Tracking results over time, with cycle context attached, shows the pattern a one-off draw can't.

How Go Go Gaia Tracks hs-CRP

Go Go Gaia doesn't draw blood or run lab work. You upload an hs-CRP result from a lab draw you've already had done, and the app stores it as a dated data point next to your other health data. The app keeps hs-CRP and standard CRP as separate lab entries, since they come from different assays, and charts each over time so you can see where a draw fell relative to your cycle.

What the Research Shows

CRP is synthesized primarily in liver hepatocytes and can increase up to 1,000-fold at sites of infection or inflammation, which is why it works as a general inflammation marker.^[2]

The elevation is non-specific. Numerous conditions raise CRP, both acute and chronic, infectious and non-infectious, so the value marks the presence of inflammation rather than pointing to a cause.^[1]

In the BioCycle Study of 259 healthy premenopausal women, CRP varied significantly across the menstrual cycle, and a 10-fold rise in estradiol was associated with a roughly 24% decrease in CRP.^[5]

Related Terms

Frequently Asked Questions

Educational information based on published sources. Not medical advice. For personal concerns, please consult your doctor.

What's the difference between CRP and hs-CRP?

Both tests measure the same protein, C-reactive protein. The difference is the assay. A standard CRP test picks up the larger elevations that come with acute inflammation, while an hs-CRP test uses a more precise method that can measure the low concentrations a standard test can't reliably detect. Go Go Gaia stores them as separate lab entries so each result stays with the test that produced it.

Can an hs-CRP test show what's causing inflammation?

No. According to the NIH's MedlinePlus, a CRP result tells you how much inflammation is present in the body, not what's causing it or where it is. Many different states can raise CRP, including infections, injuries, and chronic inflammatory conditions, so the number is a general marker rather than a diagnosis of anything.

Does Go Go Gaia run hs-CRP tests?

No. Go Go Gaia doesn't draw blood or run labs. You get an hs-CRP result from a blood draw ordered through a clinician or lab service, then upload it to your Go Go Gaia account so it's stored and charted alongside your other tracked data.