A Brix refractometer can be used to measure IgG in colostrum. The scale in a Brix refractometer is designed to measure the amount of sucrose in a solution, but Brix values can be related to IgG in colostrum. A Brix value of 22% corresponds to 50 mg/mL, meaning colostrum with a Brix value above this cut off point can be considered high quality colostrum.
