The Curious Clinicians 122 - When CRP Goes Missing
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Feb 12, 2026 A clinical pearl about why active lupus often shows high ESR but low CRP. A clear contrast between what ESR and CRP actually measure. Discussion of cytokine signatures that suppress CRP, including interferon pathways and TLR activation. Practical use of the ESR:CRP ratio to hint at infection versus autoimmune activity.
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ESR–CRP Discordance In Active Lupus
- In active lupus the ESR is typically high while CRP is often normal or only modestly elevated.
- This ESR–CRP discordance reveals different inflammatory pathways driving each marker.
Use ESR:CRP Ratio To Suspect Infection
- Use the ESR:CRP ratio as a clue to distinguish active lupus alone from lupus with concomitant infection.
- An ESR:CRP ratio ≥15 strongly suggests active lupus without bacterial infection.
TLR4/IL‑6 Axis Produces High CRP
- Bacterial triggers (eg, LPS → TLR4) drive IL‑6 production and robust hepatic CRP synthesis.
- Gram‑negative sepsis commonly produces very high CRP values (>100 mg/L).