In this paper three different ways to calculate the temperature dependent susceptibility of the enhanced paramagnets Pd and Pt are presented and compared. Special attention is paid to the relative importance of one-particle and many-particle excitations. One of these methods has never been applied before to real itinerant systems. It is based upon Onsager's reaction field model, which seems to be a feasible and rigorous way to go beyond the mean field approximation, and it allows one to make quantitative statements. The backbone of this theory is the calculation of a temperature dependent Hubbard U due to thermal many-body excitations. In contrast to an earlier calculation we found a significant temperature dependence of U for Pd. The theoretical results are in fairly reasonable agreement with the experimental findings for both Pd and Pt.