From early assay design through production, Pel-Freez helps in vitro diagnostic test developers reduce risk with reliable, well-characterized biological reagents. Our blood products, complement, sera, and tissues are known worldwide for quality and consistency.
Key applications we support
Coagulation assays
With unparalleled access to rabbits raised in our own US-based farms and trusted supplier network, Pel-Freez is the premier source for high-quality rabbit brain acetone powder, rabbit brain cephalin, and other essential biologicals for the development and manufacturing of in vitro coagulation assays.
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Serological testing
Pel-Freez offers a broad range of stocked and custom biological products that support serological IVD assay development. Use our materials as diluents or active components in tissue typing, autoimmune panels, metabolic testing, and more.
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Infectious disease testing
Our human and animal blood products support robust, clinically relevant evaluation of immune responses or pathogen-associated indicators of disease. Large lot sizes and reservable inventory help ensure consistency across validation studies and product batches.
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Immunoassays and antigen detection
Reduce background and improve specificity with human IgG-, IgM-, and IgA-depleted sera. We also offer blocking sera, tissue extracts, and high-purity biological reagents from multiple species to support your EIA/RIA, ELISA, lateral flow, and other IVD assay development needs.
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Controls, stabilizers, and kit validation
Establish assay integrity and regulatory compliance with ethically sourced biological materials for use as positive and negative controls, matrix-matched samples, and lot-to-lot verification standards.
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Need a custom reagent for your kit?
We offer custom dissection/tissue procurement, antiserum, lyophilization, and other bioprocessing services. Our team follows strict QC processes to help you build reliable, scalable in vitro diagnostic testing protocols and kits.
Why IVD developers choose Pel-Freez
We help you build better tests with consistent reagents and a supply you can count on.
What researchers say about Pel-Freez
“We have ordered from Pel-Freez for over a decade and they are always willing to go above and beyond in making sure we can obtain the right product for our specific research needs.”
“Pel-Freez is our first choice as a supplier for biological matrices and complement. Their product quality and consistency of product lot to lot enables us to develop premier bacterial assays in support of the world' s premier vaccine biopharmaceutical companies with confidence.”
Frequently Asked Questions
May I receive a sample of your products? Will you hold a reserve of the product while I complete my testing?
Yes! We understand our products are used in a variety of applications and testing is often required to ensure acceptability. We are happy to provide samples and hold reserves up to 30 days. While we often have multiple inquiries for each lot of our products, we do our best to fulfill all customer requests.
Can I order products from a single lot? Can I order products from several different lots?
Yes, you can request products that originate from a single lot or from several different lots. We are usually able to accommodate these requests but availability may vary due to maximum lot volumes for certain products. We try to maintain a minimum inventory of ten 5+ liter baby rabbit complement (BRC) lots at all times so that customers have options to select from.
We recommend that you contact us directly with your request on our contact page or by emailing biosales@pel-freez.com.
What is the difference between item 41110 and 41170 rabbit brain acetone powders?
Each of these rabbit brain acetone powders begins with a frozen rabbit brain as the raw material prior to acetone drying and powder production. Product 41170 (Rabbit Brain Acetone Powder Varisens) includes barium sulfate during processing, while product 41110 (Rabbit Brain Acetone Powder) does not. Barium sulfate acts to bind clotting factors, which may speed coagulation; thus, the 41170 Varisens powder has increased sensitivity to clotting deficiencies.
How does Pel-Freez support in vitro diagnostic (IVD) assay development?
We supply raw biological materials (blood products, sera, extracts, tissues, etc.) that are used in IVD assays to detect proteins, antibodies, infectious agents, and coagulation markers. Our human- and animal-derived materials have been used by leading pharma and biotech companies as essential components, controls, and validation samples across R&D and manufacturing stages.
