C-Reactive Protein (CRP) Blood Test
Clinical Acute Inflammation & Infection Marker
C-Reactive Protein (CRP) is a vital protein produced by your liver in response to inflammation, infection, or tissue injury anywhere in the body. Because CRP levels rise rapidly within hours of an acute inflammatory trigger and fall quickly as you recover, this test provides a clear, reliable clinical snapshot of active systemic inflammation, infection recovery, or autoimmune flare-ups.
UNIQUE BIOMARKERS MEASURED
1
View included biomarker & what each measures
- C-Reactive Protein (CRP)Quantifies systemic CRP levels in the blood (mg/L) to identify active inflammation, acute bacterial or viral infections, tissue injury, or flare-ups of chronic inflammatory conditions.
CRP is non-specific and should be interpreted alongside symptoms and medical history.
Adults experiencing unexplained persistent aches, joint stiffness, or suspected inflammatory flare-ups.
- Individuals monitoring chronic inflammatory or autoimmune conditions between clinic appointments.
- Anyone checking whether a recent infection or tissue injury is actively resolving.
If you are feeling acutely unwell, have severe or rapidly worsening symptoms, or are already under the care of a healthcare professional for a related condition, please speak to them before ordering or alongside testing.
Home finger-prick blood sample, collected by you at home using the supplied kit. Full step-by-step instructions are included.
Collect your sample in the morning where possible.
Best for investigating active bodily inflammation, unexplained aches/joint stiffness, recent infection recovery, or monitoring chronic inflammatory conditions.
Best if you feel generally well but want to measure ultra-low levels of vascular inflammation to assess long-term heart and cardiovascular health.
- Home finger-prick collection kit included (1 small sample tube)
- Prepaid Royal Mail Tracked 24 return mailer included
- Analysed by The Doctors Laboratory (UKAS Accredited)
- Free replacement kit guarantee if your sample clots or is insufficient
Collection Confidence Guarantee
- Simple at-home finger-prick collection kit included
- Prepaid Royal Mail Tracked 24 return mailer included
- Analysed by The Doctors Laboratory (UKAS Accredited)
- Free Replacement Kit Guarantee: if your sample clots or is insufficient for laboratory analysis, we dispatch a replacement kit free of charge.
- No hidden test or delivery charges
Drop in any postbox using the prepaid Royal Mail Tracked 24 mailer.
24–72 hours (1–2 working days) from laboratory receipt
Turnaround begins as soon as The Doctors Laboratory receives your sample via Tracked 24 post. Covered by our Free Sample Replacement Guarantee if your sample is insufficient.
How You'll Receive Your Results
Once your laboratory analysis is complete, your original laboratory report will be delivered securely to your verified email address.
- Original laboratory PDF report
- Sent to your verified email address
- Secure results delivered via email
- Reports are not stored in your OptiBlood website account
- Please check that your email address is correct before completing your order
CRP is non-specific and should be interpreted alongside symptoms and medical history.
A result within the reference range does not rule out a condition, and a result outside the range does not by itself confirm one. Results should be considered alongside your symptoms and medical history.
A laboratory result is information, not a diagnosis. Discuss concerning results, or results that differ from what you expected, with an appropriate healthcare professional. They can interpret your results alongside your symptoms and medical history.
OptiBlood tests provide laboratory information and are not a substitute for medical diagnosis, physical examination or emergency care. Discuss concerning results or symptoms with an appropriate healthcare professional.