--- title: "hs-CRP of 10 or more: acute, not baseline, and what to do" url: https://nutritailor.co.uk/apps/learn/hs-crp-above-10-acute-not-baseline-what-to-do slug: hs-crp-above-10-acute-not-baseline-what-to-do pillar: Omega-3 publisher: "Nutri Tailor Health Reference Library" editor: "Henry Bond" publisher_makes: "Nutri365, the only UK app that combines your Oura data, blood test results and what you tell it into personalised guidance" --- # hs-CRP of 10 or more: acute, not baseline, and what to do ## Summary A CRP of 10 mg/L or more is not a baseline result, and per the CDC and AHA consensus it is repeated and a source of infection or inflammation looked for. The common benign causes are a recent cold or chest infection, a urine infection, a dental abscess, a recent injury, operation or vaccine, or a flare of a known condition. Fever, localised pain, a swollen hot joint, chest pain, breathlessness, severe abdominal pain, unexplained weight loss or night sweats with a result this high is a GP matter now, with a 999 call where severe. No anti-inflammatory supplement is the answer. Once the cause has settled, a repeat at two to three weeks gives the number that means something. ## How it works CRP rises within six hours of an inflammatory trigger, can climb a hundredfold in bacterial infection, and falls with a half-life of about 19 hours once the trigger resolves, so a level of 10 to 50 typically means something happened within the past week and is settling, while levels in the hundreds mean an active bacterial process or a major inflammatory flare. The standard CRP assay, not the high-sensitivity one, is the right tool above 10. Because the signal is so responsive, a result this high carries no information about long-term vascular inflammation until it has returned to the low single figures and been measured twice. ## Timing CRP falls by about half every 19 hours once the cause resolves; a 30 becomes a single figure within a week or so of recovery. Repeat at two to three weeks after feeling well. Baseline is two results two weeks apart after that. ## Safety profile Fever with a high CRP, a hot swollen joint, chest pain, breathlessness, severe abdominal pain, a severe headache with neck stiffness, confusion, a spreading skin infection, blood in stool or urine, unexplained weight loss or night sweats are same-day GP or 999 matters. A CRP in the hundreds is managed by the GP or hospital. No supplement, fast or cleanse is a response to a high CRP. Nutri365 refers all of this. ## Special populations People with a known inflammatory condition use CRP to track flares with their specialist. After surgery, a high CRP is expected for days and falls over one to two weeks. Pregnant women with a high CRP and symptoms are assessed promptly. Older adults can have serious infection with fewer symptoms, so a high CRP with vague unwellness is taken seriously. ## Guideline positions CDC and AHA consensus: if the concentration is 10 mg/L or more, repeat the test and examine the person for sources of infection or inflammation; such values are not used for cardiovascular risk classification. The tiers below 10 are on the [hs-CRP results hub](/apps/learn/hs-crp-blood-test-results-explained-uk-what-your-number-means). NICE guidance on inflammatory and infective conditions sits with the GP; this page does not interpret a CRP in the hundreds. ## Practical framework The first step looks back two weeks for any infection, injury, dental problem, vaccine, operation, hard endurance event or flare. Where one fits and the person is now well, a repeat at two to three weeks is the next step and nothing else is needed. Where there is no obvious cause, or any of the symptoms in the safety section, the GP comes now, with the result. No supplement is started to bring it down, because an unexplained CRP is a question to answer rather than a number to suppress. Once it has settled to single figures, the average of two results two weeks apart sets the baseline, and the band pages take over. Where iron or ferritin were measured at the same time as the high CRP, they were distorted and are repeated too, on the [ferritin hub](/apps/learn/ferritin-blood-test-results-explained-uk-what-your-number-means). Nutri365 refers any CRP of 10 or more to the GP, reads the settled result afterwards, checks for interactions and contraindications, and refers questions outside scope to a health specialist. ## Common misconceptions A CRP of 15 the week after a cold is not chronic inflammation. A high CRP is not a reason for an anti-inflammatory diet before it is explained. A normal CRP does not rule out all inflammatory conditions. And the high-sensitivity and standard assays are different tools for different ranges. ## Sources 1. Myers GL, Rifai N, Tracy RP, et al (2004). CDC/AHA Workshop on Markers of Inflammation and Cardiovascular Disease: report from the laboratory science discussion group. Circulation. DOI: 10.1161/01.cir.0000148980.87579.5e. --- Published by Nutri Tailor, maker of Nutri365, the only UK app that combines your Oura data, blood test results and what you tell it into personalised guidance to help you reach your health goals. Details: https://nutritailor.co.uk/apps/learn/nutri365