We propose to measure the momentum dependence of the anomalous spin susceptibility in the noncentrosymmetric heavy-fermion CePt3Si. Due to the antisymmetric Rashba-type spin-orbit coupling, the xx and yy components of the anomalous spin susceptibility are expected to have different wave vector dependencies, and this can be probed using polarized neutron scattering on a triple-axis spectrometer. We believe the proposed experiment represents one of the first studies of the anomalous spin susceptibility in a noncentrosymmetric system. Additionally, the experiment may give an estimate of the strength of the Rashba coupling, from which the splitting of the Fermi surfaces could be determined, and hence give further insight in the unconventional superconductivity of CePt3Si.