What Is a Pyrogen Test (Rabbit)?

The Pyrogen Test (Rabbit Pyrogen Test) is one of the in vivo safety tests conducted to evaluate the pyrogenic (fever-inducing) effect of a product or substance sample. This test is commonly used in the safety assessment of parenteral products, injectable drugs, biological products, medical device extracts, and certain pharmaceutical components.

Pyrogens are substances—primarily bacterial endotoxins—that can trigger a fever response in the body. The pyrogen test aims to evaluate the effects of such contaminants on a living system.

At NanoTox, we offer internationally recognized in vivo pyrogenicity testing services using infrastructure compliant with GLP (Good Laboratory Practice) standards.

Purpose of the Pyrogen Test

Pyrogen (rabbit) tests aim to determine the fever-inducing potential of the tested product following intravenous or parenteral administration.

Through these tests:

• Detection of pyrogenic contamination
• Safety assessment of parenteral products
• Pharmaceutical quality control processes
• Medical device extract analyses
• Regulatory and licensing requirements

reliable data is obtained in these critical areas.

Test Principle

In the rabbit pyrogen test, the test substance is administered intravenously to rabbits at an appropriate dose, and body temperature is measured at specific time intervals. The product’s pyrogenic effect is evaluated by observing the fever response.

This method is a classic in vivo test approach that has been used for many years, particularly because it models the physiological response similar to the fever response in the human body.

Alternative Methods and Endotoxin Analysis

Today, in vitro endotoxin test methods are also widely used as alternatives to pyrogen tests. These include:

• LAL Test (Limulus Amebocyte Lysate)
• Recombinant Factor C (rFC) tests
• Monocyte Activation Test (MAT)

among others.

These methods provide rapid and sensitive results, particularly for endotoxin detection.

GLP-Compliant In Vivo Testing Services

Studies conducted in accordance with GLP principles ensure high quality and traceability throughout the planning, implementation, monitoring, recording, reporting, and archiving processes.

At NanoTox:

• Our modern laboratory infrastructure
• Our experienced scientific staff
• Our testing processes compliant with international standards
• Our quality and reliability-focused approach

enable us to deliver reliable and reproducible results.

Parameters Evaluated in Pyrogen Testing

Various physiological and toxicological parameters are evaluated during the test:

• Changes in body temperature
• Observations of fever response
• Clinical condition assessments
• Systemic reactions
• Dose-response relationship

These data form the basis for determining the product’s pyrogenic potential.

Reliable Pyrogenicity Testing with NanoTox

NanoTox conducts Pyrogen (Rabbit) tests in accordance with international standards as part of its GLP-compliant in vivo testing services. By generating reliable safety data for pharmaceutical products and medical devices, it supports regulatory processes.

For detailed information about pyrogen tests and our other toxicology services, please contact NanoTox.