The technique used in this case is FACS or FaCS may refer to: Fluorescence-activated cell sorting, applied in flow cytometry. Reagents used to obtain these results are(; (BIORAD): Antibodies Reagents; (BIORAD) Solution The technique used in this case is FACS or FaCS may refer to: Fluorescence-activated cell sorting, applied in flow cytometry. Reagents used to obtain these results are(; (BIORAD): Antibodies Reagents; (BIORAD).