Inflammatory Markers (ESR & C-Reactive Protein / hs-CRP)
Also known as: Erythrocyte Sedimentation Rate, C-Reactive Protein, hs-CRP, Acute Phase Reactants, Inflammation Panel
Parameters Measured in the Report
A breakdown of individual biomarkers and biological reference intervals typically found in your report:
| Biomarker | Standard Range | Unit | What It Means |
|---|---|---|---|
C-Reactive Protein (Standard CRP) (CRP) | Normal: < 5.0 (or < 10.0 depending on lab) | mg/L | Acute-phase hepatic protein that surges rapidly within 6 hours of tissue trauma or bacterial infection. |
High-Sensitivity CRP (hs-CRP) (Cardiac CRP) | Low Risk: < 1.0 Average Risk: 1.0–3.0 High Risk: > 3.0 | mg/L | Ultra-sensitive assay measuring subtle, low-grade vascular inflammation for cardiovascular risk stratification. |
Erythrocyte Sedimentation Rate (ESR) (Sed Rate (Westergren)) | Men < 50: < 15 Men > 50: < 20 Women < 50: < 20 Women > 50: < 30 | mm/hr | Measures how many millimeters red blood cells sediment in one hour; reflects chronic inflammation. |
* Note: Reference ranges may vary slightly between testing instruments and reagent kits. Always refer to the reference interval printed on your specific pathology report.
Clinical Focus
Rate of red blood cell settling (ESR) and hepatic acute-phase reactant protein concentration (CRP / hs-CRP).
Sample & Specimen
Venous blood (Serum & EDTA tube)
Fasting Protocol
No fasting required. Maintain normal diet and fluid intake.
Turnaround Time
4–8 hours (same day)
What Is This Test?
Why Did Your Doctor Order This Test?
Physicians routinely prescribe the ESR & CRP in the following clinical scenarios:
How to Prepare Before Your Test
- No fasting required.
- Inform your doctor if you recently had a cold, dental infection, or minor trauma, as even a mild viral infection will temporarily elevate CRP.
Understanding Your Results
What higher or lower readings generally mean in clinical practice:
If Values Are Higher Than Normal
Very high standard CRP (>50–100 mg/L) points toward serious acute bacterial infection, sepsis, major tissue trauma, or severe autoimmune flare. High ESR (>60–100 mm/hr) raises suspicion for temporal arteritis, polymyalgia rheumatica, chronic infections (like tuberculosis), or multiple myeloma.
If Values Are Lower Than Normal
Low CRP and low ESR are normal and desirable, indicating the absence of significant systemic inflammatory activity in the body.
Frequently Asked Questions
What is the main difference between ESR and CRP?
CRP responds rapidly (surges within hours of inflammation and clears quickly once treated), making it ideal for acute tracking. ESR rises and falls much more slowly over days or weeks, making it useful for tracking chronic disease.
Related Laboratory Tests
Tests frequently prescribed together or used as follow-up investigations:
Complete Blood Count (CBC / Hemogram)
Counts and evaluates red blood cells, white blood cells, hemoglobin, hematocrit, and platelets.
Lipid Profile (Cholesterol Panel)
Total Cholesterol, HDL (good cholesterol), LDL (bad cholesterol), VLDL, and Triglycerides.
Kidney Function Test (KFT / RFT / Renal Panel)
Serum Creatinine, Blood Urea Nitrogen (BUN), eGFR (filtration rate), Uric Acid, and Electrolytes.
Medical & Diagnostic Disclaimer
This guide is published for educational and patient informational purposes only. It is not a substitute for professional medical evaluation, diagnosis, or clinical advice.
A laboratory result that falls slightly outside standard statistical reference intervals does not automatically indicate disease; conversely, a normal result does not guarantee the absence of medical conditions. Only your attending physician can interpret lab findings in the context of your medical history, physical exam, and symptoms.