A noninvasive system and method for simultaneous monitoring of species in a cell culture medium is described. Instead of direct contact with the culture media, the measurements can be made through permeable membranes via either a port in the culture vessel wall or a port in a flow cell. The noninvasive monitoring system and method can offer accurate, and contamination-minimized monitoring of critical process parameters including dissolved O2, pH, and dissolved CO2. These advancements will enhance the control and optimization of cell culture processes, promising improved cell culture performance.