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We consider the cubic-quintic nonlinear Schr\"odinger equation in two spacedimensions. For this model, X. Cheng established scattering for $H^1$ data withmass strictly below that of the ground state for the cubic NLS. Subsequently,R. Carles and C. Sparber utilized the pseudoconformal energy estimate to obtainscattering at the sharp threshold for data belonging to a weighted Sobolevspace. In this work, we remove the weighted assumption and establish scatteringat the threshold for radial data in $H^1$.

Threshold scattering for the 2d radial cubic-quintic NLS