McFarland standard IVD

McFarland standard IVD refers to a reference solution used to estimate bacterial concentration in a suspension by comparing its turbidity to that of the standard. It is prepared from precise mixtures of barium chloride and sulfuric acid and is employed to standardize inoculum size in microbiological testing, such as antimicrobial susceptibility assays and microbial identification procedures.

Devices in this category are regulated as in vitro diagnostic medical devices and are intended for laboratory use to ensure consistency and reproducibility in microbial testing. They are supplied as stabilized liquid or lyophilized formulations and are not intended for direct patient contact or therapeutic use.