CRP Rapid Test: Semi-quantitative Point-of-Care Detection in 10 Minutes

When a patient presents with symptoms of infection — fever, fatigue, localized pain — the clinical question is rarely simple. Is the infection bacterial or viral? Should antibiotics be prescribed? Is the inflammation mild or severe? C-reactive protein (CRP), an acute-phase protein produced by the liver, provides a rapid biochemical signal that helps answer these questions. Elevated CRP levels correlate with the presence and severity of inflammation, making CRP testing a cornerstone of clinical assessment worldwide.

The GHM C-Reactive Protein (CRP) Semi-Quantitative Rapid Test US from Global Healthcare Medical brings CRP detection to the point of care. Using colloidal gold immunochromatography, the test delivers semi-quantitative results in 10 minutes from a small sample of whole blood, serum, or plasma — enabling clinicians to make informed decisions during the patient encounter rather than waiting hours or days for laboratory results.

What Is C-Reactive Protein and Why Does It Matter?

C-reactive protein is synthesized by the liver in response to interleukin-6 (IL-6) and other inflammatory cytokines. Under normal conditions, CRP levels in blood are low — typically below 10 mg/L. When inflammation, infection, or tissue damage occurs, CRP concentration rises within 6–12 hours and can increase a hundredfold or more within 24–48 hours.

This rapid, dramatic response makes CRP a sensitive — though non-specific — marker of inflammation. The World Health Organization has identified CRP as a valuable biomarker for antibiotic stewardship in primary care, and point-of-care CRP testing has been shown to reduce inappropriate antibiotic use when implemented in routine practice.

CRP Level Classification

The GHM CRP Semi-Quantitative Rapid Test classifies results into four clinically meaningful ranges:

CRP Range	Classification	Color Indicator
<10 mg/L	Normal	Green
10–40 mg/L	Mild Inflammation	Yellow/Orange
40–80 mg/L	Moderate Inflammation	Red
>80 mg/L	Severe Inflammation	Dark Red

The cut-off values of 10, 40, and 80 mg/L align with clinical thresholds used to guide treatment decisions. A CRP below 10 mg/L generally indicates the absence of significant systemic inflammation, while levels above 80 mg/L suggest severe infection or inflammatory processes that warrant urgent clinical attention.

Product Overview: GHM CRP Semi-Quantitative Rapid Test

The GHM C-Reactive Protein (CRP) Semi-Quantitative Rapid Test US (product code GDCRP-T402b) is a lateral flow chromatographic immunoassay designed for the semi-quantitative detection of CRP in human whole blood, serum, or plasma. The test is intended for professional in vitro diagnostic use as an aid in the assessment of inflammatory conditions and the clinical evaluation of infections.

Each kit contains 25 tests, including test cassettes, buffer, disposable droppers, and instructions for use. The test is manufactured under an EN ISO 13485 certified quality management system and is CE marked for professional diagnostic use.

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Key Features and Technology

Colloidal Gold Immunochromatography

The test uses colloidal gold-conjugated monoclonal antibodies specific to CRP. When a specimen is applied to the test cassette, CRP in the sample binds to the gold-conjugated antibodies and migrates along the test strip. At the test line, immobilized capture antibodies bind the CRP-antibody complex, producing a visible colored line. The intensity of the test line is compared against a reference scale to classify CRP into the four concentration ranges. An internal procedural control line confirms proper test performance.

10-Minute Results for Point-of-Care Use

The test delivers semi-quantitative results in 10 minutes, enabling clinicians to make assessment decisions during the patient encounter. Results should be interpreted at the 10-minute mark and should not be read after 15 minutes. This rapid turnaround supports efficient patient workflow in primary care clinics, emergency departments, and other point-of-care settings where immediate results inform treatment decisions.

Multi-Specimen Compatibility

The test accepts three specimen types: whole blood collected via venipuncture or fingerstick, serum, and plasma. Fingerstick collection enables minimally invasive testing suitable for primary care and community settings, while serum and plasma compatibility supports use in laboratory environments. Only a small sample volume is required, making the test practical for both pediatric and adult patients.

Semi-Quantitative Result Classification

Unlike qualitative tests that simply report positive or negative results, the GHM CRP test provides semi-quantitative classification into four ranges. This multi-level classification helps healthcare professionals distinguish between normal, mild, moderate, and severe inflammation — supporting more nuanced clinical decision-making than a binary result would allow.

Antibiotic Stewardship Support

Point-of-care CRP testing is increasingly recognized as a tool for antimicrobial stewardship. In primary care settings, rapid CRP results help clinicians differentiate bacterial from viral infections, particularly in patients presenting with respiratory tract infections. The World Health Organization has identified CRP as a valuable biomarker for antibiotic stewardship in primary care, and studies have shown that point-of-care CRP testing can reduce inappropriate antibiotic prescriptions when implemented correctly.

ISO 13485 Certified and CE Marked

The VivaDiag product line is manufactured under an EN ISO 13485 certified quality management system covering in vitro diagnostic test kits and analyzers based on immunochromatography. The test is CE marked for professional in vitro diagnostic use, demonstrating conformity with applicable European regulatory requirements.

Product Specifications

Parameter	Specification
Model / SKU	GHM C-Reactive Protein (CRP) Semi-Quantitative Rapid Test US
Product Code	GDCRP-T402b
Product Type	CRP Semi-Quantitative Rapid Test (Colloidal Gold)
Intended Use	Semi-quantitative detection of CRP in whole blood, serum, or plasma; aid in assessment of inflammatory conditions
Detection Principle	Lateral flow chromatographic immunoassay; colloidal gold
Target Analyte	C-Reactive Protein (CRP)
Specimen Types	Whole Blood (venipuncture or fingerstick) / Serum / Plasma
Time to Result	10 minutes
Sensitivity	87–98% (at 10 mg/L threshold)
Specificity	91–98% (at 10 mg/L threshold)
Cut-off Values	10, 40, 80 mg/L
Result Classification	<10 mg/L (normal), 10–40 mg/L (mild), 40–80 mg/L (moderate), >80 mg/L (severe)
Storage Temperature	2–30°C (35.6–86°F)
Shelf Life	18–24 months
Kit Size	25 tests/kit
Kit Contents	Test Cassette, Buffer, Disposable Droppers, Instructions for Use
Regulatory Status	EN ISO 13485 certified; CE marked
Intended User	Professional healthcare use only

How the GHM CRP Rapid Test Works

Step-by-Step Testing Procedure

1. Prepare: Allow the test kit and sample to reach room temperature (15–30°C) prior to testing.

1. Collect Sample: For fingerstick whole blood, clean the fingertip with an alcohol swab, allow to dry, and collect blood using a sterile lancet. For venipuncture, serum, or plasma, follow standard collection protocols.

1. Add to Buffer: Add the specimen to the sample buffer tube according to the instructions and mix well.

1. Apply to Cassette: Apply the prepared sample to the test cassette.

1. Wait 10 Minutes: Allow the test to develop for 10 minutes.

1. Interpret Results: Compare the test line intensity against the reference scale to classify CRP into the appropriate range. Do not interpret results after 15 minutes.

The test includes an internal procedural control line that confirms proper test performance. If the control line does not appear, the test is invalid and should be repeated with a new cassette.

Application Scenarios

Clinical Setting	Primary Use Case	Specimen Preference
Primary Care Clinics	Rapid assessment of inflammation to guide antibiotic prescribing decisions for respiratory tract infections	Fingerstick whole blood (minimally invasive)
Emergency Departments	Quick triage of suspected infection or sepsis; risk stratification	Venipuncture whole blood or plasma
Hospital Laboratories	Screening and preliminary assessment before confirmatory quantitative testing	Serum or plasma
Clinical Laboratories	High-throughput screening with semi-quantitative classification	Serum or plasma
Community Healthcare	Decentralized testing in settings with limited laboratory infrastructure	Fingerstick whole blood

CRP Result Interpretation Guide

CRP Range	Classification	Clinical Significance	Typical Next Steps
<10 mg/L	Normal	No significant systemic inflammation detected	Consider non-inflammatory causes; a normal CRP does not exclude localized infection
10–40 mg/L	Mild Inflammation	Early or mild inflammatory response; may indicate viral infection or low-grade bacterial infection	Monitor; consider clinical findings and follow-up testing
40–80 mg/L	Moderate Inflammation	Active inflammatory process; bacterial infection more likely	Consider further diagnostic workup; evaluate need for antibiotic therapy
>80 mg/L	Severe Inflammation	Significant systemic inflammation; severe infection or acute inflammatory condition	Urgent clinical assessment; consider hospitalization and additional diagnostics

Note: CRP levels may be elevated in various inflammatory conditions, including infections, autoimmune disorders, and tissue injury. Results should be interpreted in conjunction with clinical findings and other laboratory results. A normal CRP level does not exclude the possibility of localized infection or inflammation. The test provides a preliminary result; laboratory-based quantitative testing may be required for confirmation and monitoring.

Why Healthcare Professionals Choose the GHM CRP Test

Feature	Benefit
Colloidal gold immunochromatography	Established and reliable detection technology
10-minute test time	Rapid turnaround for timely clinical decisions
Whole blood / serum / plasma compatibility	Flexible sampling options for diverse clinical settings
Semi-quantitative detection	Estimated CRP concentration for clinical decision-making
87–98% sensitivity, 91–98% specificity	Reliable clinical performance at 10 mg/L threshold
Multi-level result classification	Distinguishes normal, mild, moderate, and severe inflammation
Antibiotic stewardship support	Helps guide appropriate antibiotic prescribing decisions
EN ISO 13485 certified, CE marked	Quality management system compliance and regulatory conformity
Point-of-care compatible	Suitable for primary care, emergency, and clinical laboratory settings

Frequently Asked Questions

What is a CRP semi-quantitative rapid test?

A CRP semi-quantitative rapid test is a lateral flow immunoassay that detects C-reactive protein in whole blood, serum, or plasma and classifies the result into concentration ranges — typically below 10 mg/L (normal), 10 to 40 mg/L (mild inflammation), 40 to 80 mg/L (moderate inflammation), and above 80 mg/L (severe inflammation). The GHM CRP test delivers results in 10 minutes at the point of care.

How long does the GHM CRP rapid test take to produce results?

The GHM CRP Semi-Quantitative Rapid Test produces results in 10 minutes. Results should be interpreted at the 10-minute mark and should not be read after 15 minutes.

What sample types are compatible with the GHM CRP rapid test?

The test is compatible with whole blood collected via venipuncture or fingerstick, serum, and plasma. This multi-specimen compatibility allows flexible sample collection across different clinical settings, from primary care clinics to hospital laboratories.

What CRP concentration ranges does the test classify?

The test classifies CRP levels into four ranges: below 10 mg/L (normal), 10 to 40 mg/L (mild inflammation), 40 to 80 mg/L (moderate inflammation), and above 80 mg/L (severe inflammation). The cut-off values are 10, 40, and 80 mg/L.

What is the sensitivity and specificity of the GHM CRP rapid test?

At a 10 mg/L threshold, the sensitivity of semi-quantitative rapid CRP tests has been reported to range from 87 to 98 percent and specificity from 91 to 98 percent, based on published evaluations. A systematic review and meta-analysis of point-of-care CRP devices reported pooled sensitivity of 70 percent and specificity of 86 percent.

Is the GHM CRP rapid test suitable for home use?

No. The GHM CRP Semi-Quantitative Rapid Test is intended for professional in vitro diagnostic use only and should be used by trained healthcare professionals. It is designed for primary care clinics, emergency departments, hospital laboratories, and clinical laboratories.

What is the shelf life and storage temperature for the CRP test kit?

The kit has a shelf life of 18 to 24 months and should be stored at 2 to 30 degrees Celsius (35.6 to 86 degrees Fahrenheit). Each kit contains 25 tests, including test cassettes, buffer, disposable droppers, and instructions for use.

How does CRP testing support antibiotic stewardship?

Point-of-care CRP testing helps clinicians distinguish between bacterial and viral infections at the time of patient assessment. By providing rapid semi-quantitative CRP levels, the test supports informed antibiotic prescribing decisions, particularly in primary care settings where respiratory tract infections are common. The World Health Organization has identified CRP as a valuable biomarker for antibiotic stewardship in primary care.

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Support Inflammation Assessment at the Point of Care

The GHM CRP Semi-Quantitative Rapid Test brings rapid, reliable CRP detection to the point of care — 10-minute results, multi-specimen compatibility, four-level classification, and ISO 13485 certified manufacturing. For primary care, emergency, and laboratory settings, it provides the biochemical signal clinicians need to make informed decisions during the patient encounter.

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