MICA · FIRST-LINE LEARNING NOTES
Understand, prioritise and organise follow-up
Raised CRP or ESR describes a biological context rather than a cause. Seek a focal process, organ involvement or an informative clinical course.
Place the result within a clinical history
Check why the test was ordered, previous results and concurrent symptoms: fever, focal pain, cough, urinary complaints, joint or skin features and weight loss. Review infections, procedures, travel and medication changes. Inflammation may accompany infection, inflammatory disease, malignancy or tissue injury; no single marker determines which category is responsible.
[1][2]Seek discriminating clinical clues
Repeat examination may reveal a murmur, lymph node enlargement, synovitis or purpura not apparent from the initial history. Select blood counts, kidney tests, urinalysis, liver tests and microbiology or imaging based on findings. In someone over 50, new headache, jaw claudication or visual symptoms suggest giant cell arteritis; specialist imaging must not delay urgent care when vision is threatened.
[3][1]An inflammatory marker provides neither localisation nor an aetiological diagnosis. Relate its trend to symptoms, treatments and intercurrent events. Inflammation with new headache, jaw claudication or visual disturbance should prompt consideration of giant cell arteritis according to age and context. A markedly elevated value alone does not justify immunosuppression.
[3][2]Prioritise severity and persistence
Organ dysfunction or rapid deterioration requires hospital assessment. Persistent unexplained inflammation calls for a chronological specialist summary rather than accumulating unrelated tests. High ferritin is not synonymous with Still’s disease: accompanying persistent fever, cytopenias or liver abnormalities may indicate severe hyperinflammation. An unstructured diagnostic trial of corticosteroids can complicate subsequent investigation.
[2]- Visual symptoms suggestive of arteritis require urgent assessment without waiting for repeat CRP.
- With persistent fever and inflammation, assess organ involvement rather than multiplying non-specific markers.
- Explain why repeat testing is requested and which changes would alter the management plan.
Follow the patient as well as the marker
Interpret marker trends alongside temperature, symptoms and examination. Record unresolved hypotheses and who will review outstanding results. Falling CRP does not justify overlooking weight loss, progressive lymphadenopathy or an organ-specific symptom. If no cause emerges, arrange clinical reassessment and a risk-based, stepwise strategy.
[1][2]A learning situation
FICTIONAL CASE · SELF-REFLECTION WITHOUT A SCORE
A 71-year-old woman is referred for raised inflammatory markers. Repeat questioning identifies new headache and jaw pain while chewing. She has just experienced brief blurred vision.
Which feature changes the priority immediately?
Read the reasoning
The visual symptom with cranial features raises concern for giant cell arteritis and ischaemic risk. Arrange urgent assessment rather than waiting for another CRP or a distant appointment. Specialist imaging should document the hypothesis within a pathway that protects vision. If suspicion is strong with ischaemic visual symptoms, indicated medical treatment must start immediately, without waiting for imaging or biopsy.
References and scope
- Suspected cancer: recognition and referral (NG12): actions by symptom and findings ↗
- EULAR/PReS recommendations for the diagnosis and management of Still’s disease, comprising systemic juvenile idiopathic arthritis and adult-onset Still’s disease ↗
- EULAR recommendations for the use of imaging in large vessel vasculitis in clinical practice: 2023 update ↗
Original educational synthesis for adult first-line practice. International references must be interpreted with the clinical setting and local care pathways. Independent human scientific review remains to be confirmed.