For clinical reference only — does not replace local trust guidelines or clinical judgement.
‹ Blood Results
Blood Results

Raised CRP

Raised CRP

Severity
Range
  • Mild
    CRP 10–50
  • Moderate
    CRP 50–150
  • Severe
    CRP > 150 or rising rapidly with sepsis features
🫁

Respiratory Causes

Pneumonia (CAP, HAP, aspiration)Empyema, lung abscessPE (modest rise)TB
🫃

Abdominal Causes

Cholangitis, cholecystitis, pancreatitisDiverticulitis, appendicitis, perforationIntra-abdominal abscess / collectionIschaemic bowel
🚽

Urinary / pelvic Causes

Pyelonephritis, complicated UTIProstatitis, epididymo-orchitisPID, tubo-ovarian abscess
🩹

Skin / soft tissue / bone Causes

Cellulitis, abscess, necrotising fasciitisSeptic arthritis, osteomyelitisWound / cannula / line infectionPressure-sore deep infection
❤️

Endovascular / device Causes

EndocarditisLine-related bacteraemia (PICC, Hickman, dialysis)Infected prosthesis / graft
🧬

Non-infective inflammation Causes

Active rheumatoid arthritis, IBD flare, vasculitisCrystal arthropathy (gout, pseudogout)Recent surgery / trauma (expected rise)MI, PE, DVTMalignancy (lymphoma, renal, hepatic)
💊

Drugs / iatrogenic Causes

Drug reaction (DRESS)Post-vaccination / post-infusionRecent surgery (peaks day 2–3)