1. What It Is
C-reactive protein (CRP) is an acute-phase protein mainly produced by the liver into the blood in response to inflammation. CRP levels rise rapidly following inflammatory stimuli and decline promptly once the trigger resolves, making it a valuable tool for early diagnosis and treatment monitoring.
Parameter
|
C-reactive protein (CRP)
|
Primary Site of Production
|
Liver
|
Clinical Utility
|
● Monitor inflammation and guide patient management
● Differentiate bacterial from viral infections: CRP level ≥ 50 mg/L are linked to bacterial infections in ~ 90% of cases
|
CRP Response & Half-life
|
● Onset of increase: 6–8 hours
● Peak: 24–48 hours
● Half-life: ~19 hours
|
2. Why It Matters

(1) Reliable biomarker: Clinically validated indicator of systemic inflammation, infection, autoimmune disorders, and cardiovascular risk.
(2) Actionable insights: Supports differential diagnosis (bacterial vs viral), informs antibiotic prescribing, and monitors disease activity to guide treatment.
(3) POC advantage: Rapid, on-site testing enables timely clinical decisions in primary care, emergency, and bedside settings.
3. Reference Ranges:
Item
|
Result
|
Interpretation
|
High-sensitivity C-reactive protein (hs-CRP Assay Kit)
(assessing risk of cardiovascular events)
|
1 mg/L
|
Low cardiovascular risk
|
1–3 mg/L
|
Moderate cardiovascular risk; anti-inflammatory therapy recommended
|
≥ 3 mg/L
|
High cardiovascular risk; anti-inflammatory and antithrombotic therapy recommended
|
C-Reactive Protein (CRP Test Kit)
|
< 10 mg/L
|
Normal
|
> 10 mg/L
|
Indicates inflammation; possible infection, autoimmune disease, or chronic inflammation
|
> 50 mg/L
|
Indicates bacterial infection (~90%); viral infection uncommon
|
> 100 mg/L
|
Severe elevation, generally seen in acute bacterial infections
|
Note: Results should be interpreted in the context of the patient’s clinical condition. Laboratories are recommended to establish population-specific reference values for their region, as the levels may vary with demographic and methodological factors.
4. When and Where to Measure CRP
Clinical Setting
|
When / Indication
|
Purpose / Clinical Use
|
Primary care / Outpatient clinics
|
At onset of acute symptoms; routine follow-up for chronic inflammation
|
Rapid assessment of infection; guide antibiotic use; monitor autoimmune disease activity
|
Emergency department / Urgent care
|
Suspected acute infection, fever, or trauma
|
Triage patients; monitor acute inflammation and treatment response
|
Hospital / Laboratory / ICU
|
Post-surgery, trauma, sepsis, or during treatment
|
Assess inflammation; monitor therapy effectiveness, and track disease progression
|

5. Why Poclight CRP Stands Out: Facts & Features

(1) Assay Specifications
Item
|
Specification / Value
|
Detection Limit (LOD)
|
≤ 0.5 mg/L
|
Measurement Range
|
0.5 - 320 mg/L
within this linear range, the linear correlation coefficient r should be not less than 0.990
|
Sample Volume
|
5 μL
|
Sample Type
|
Serum, Plasma, Whole Blood
|
Assay Time / Turnaround
|
3 min
|
Precision (CV%)
|
5%
|
Reference Range
|
<10 mg/L
|
(2) Key Features:
a. Advanced patent technology: 5th generation homogenous CLIA, CRET technology
b. Compatible with Poclight C5000 analyzer: Designed for POC settings, auto-calibration, built-in scanner, internal mixing component, and more


c. Individually packaged: on-demand testing
d. Room-temperature transport, no cold chain required: saves logistic costs
e. Lyophilized reagents: freeze-dried reagent for room temperature storage (2–30°C) with extended shelf life of 18 months
f. Operational efficiency: intuitive process, reduced workload, and optimal lab performance
