C-Reactive Protein (CRP / hs-CRP)

Clinical interpretation, reference ranges, hs-CRP cardiovascular risk stratification, and bacterial sepsis evaluation for C-Reactive Protein (CRP).

Editorial review complete

Independent clinical validation is pending.

Validation pending

Quick Reference Facts

Specimen TypeVenous Blood (Serum)
PreparationFasting optional unless ordered with lipid panel
Turnaround Time24–48 Hours
Clinical CategoryHematology

Laboratory Interpretation Workflow

Stage 1 of 5

1. Clinical Indication

Ordering protocols based on clinical indications, presenting symptoms, or screening guidelines.

Clinical Pearl: Order when screening for primary organ dysfunctions or monitoring active treatment efficacy.

Test Description & Overview

C-reactive protein (CRP, a marker produced by the liver that rises during inflammation) (CRP): An acute-phase pentraxin reactant protein synthesized rapidly by hepatocytes in response to interleukin-6 (IL-6) stimulation during acute inflammation, bacterial infection, or tissue necrosis.

Standard Reference Range

Standard CRP: <3.0 mg/L (<0.3 mg/dL); High-Sensitivity hs-CRP (Cardiovascular Risk): Low Risk <1.0 mg/L, Average Risk 1.0 - 3.0 mg/L, High Risk >3.0 mg/L.

Elevated (High) Values

  • Severe Bacterial Sepsis / Bacteremia (>100 mg/L)
  • Acute Pyogenic Infections (Pneumonia, Osteomyelitis, Appendicitis, Abscess)
  • Active Autoimmune Flares (Rheumatoid Arthritis, IBD, Vasculitis), Acute Myocardial Infarction

Decreased (Low) Values

  • Normal Physiological State (Absence of acute systemic inflammation)
  • Severe Hepatic Failure (Impaired Hepatic Protein Synthesis Capacity)

Clinical Alignment & Significance

Marked CRP elevation (>100 mg/L) strongly points to acute invasive bacterial infection or severe tissue trauma; rapid CRP drops correlate with clinical response to effective therapy.

Diagnostic Guidance Notice

Standard laboratory reference ranges vary based on the testing facility. Significant deviations require immediate clinician review to rule out severe medical pathology.

Reference Citations & Evidence Sources

Materia Medica & Keynotes
  • CIT-0004Hahnemann S.. "Materia Medica Pura." Adolph Arnold (1811).
Clinical Reviews & Textbooks
  • CIT-0023National Center for Complementary and Integrative Health. "Homeopathy: What You Need To Know." National Institutes of Health (2021).

AI & Generative Search Citation Block

Entity IDL0004
Entity Typelab-test
Content Versionv1.1.0
Last Reviewed DateJul 31, 2026
Evidence LevelTraditional-Literature
Suggested Academic/LLM Citation format (AMA Style)

Dr. Narayan Jethwani. "C-Reactive Protein (CRP / hs-CRP)." Homeo Healthcare Clinical Platform. Version 1.1.0. Reviewed: 2026-07-31T20:30:00Z. Available at: https://homeo.healthcare/knowledge/lab-tests/crp

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