Accurate mud return measurement is critical to the safety and efficiency of every drilling operation. Coriolis flow and density measurements have become a critical component of managed pressure drilling operations, providing accurate measurement of mud returns to quickly identify potential well control events. Coriolis measurement is even being adopted for measurement on conventional rig systems as well. However, entrained gas in the mud returns can create noise in the measurement and obscure critical information for kick and loss detection. This paper will cover the impact that entrained gas has on Coriolis flow and density measurement, provide insight on how to minimize measurement interruption and describe how Coriolis diagnostics can be used to continue measuring through the noise.