Cherney FAQ

Below are some handy conversion charts for you to utilize.

Absolutely we are! Below are our certifications as well as the link to them.

A2LA Accreditation Link: https://cabportal.touchstone.a2la.org/index.cfm?event=directory.detail&labPID=64D98650-0FD4-457F-9D15-71628504A457

These questions can get pretty deep when it comes to the science of it. Let me provide some basic differences without getting too far in-depth.

VIDAS is based on Enzyme-Linked Fluorescent Assay (ELFA) technology. The method looks for specific proteins in a sample using antibodies, antigens, and a fluorescent tag. VIDAS generates an RLU (Reflective Light Unit) and (based on the results) if it's past a certain value, it is considered presumptive-positive.

Bio-Rad IQ Check is based on Polymerase Chain Reaction (PCR) technology. This method looks for the specific DNA of an organism in your sample. Bio-Rad breaks apart the cell, revealing the DNA of the organism if it is present. It then attempts to replicate the DNA in cycles and graphs it to a curve. If the curve passes a certain threshold before it hits 40 cycles, the product is considered presumptive-positive.

There are pros and cons to both methods, but my best recommendation would be to speak with our technical team if you are looking to utilize either platform. Our Cherney College courses provide a lot of great information regarding methods and technology. For VIDAS and PCR, our Advanced Food Micro course would provide a lot of details.

On your Certificate of Analysis (CoA) you may see an asterisk (*) on some of your results/counts. That is what we call an "estimated" sign.

All plate count methods have a range in which the colony count is statistically the most accurate. As an example - a yeast count is 10-150 CFU (or colony-forming units). If the colony count is in this range, there is no estimate. If it is outside that range the estimate is applied because there is increased statistical error in the result. It is a practice that is stated in reference methods for colony counting rules.

This does not mean that your results are incorrect. Reference methods and studies show that statistically there is a margin of error outside of that countable range.

CFU stands for Colony Forming Units. It has a long and dredged out definition but essentially it is a basic unit for plate counts. Each CFU is a viable colony that grew on the plate.

These colonies had the potential to grow in your product. We just gave them the perfect conditions to grow rapidly to ensure you know what the potential hazard is.