  We address conservation laws associated with current, momentum and energy and
show how they can be satisfied within many body theories which focus on pair
correlations. Of interest are two well known t-matrix theories which represent
many body theories which incorporate pairing in the normal state. The first of
these is associated with Nozieres Schmitt-Rink theory, while the second
involves the t-matrix of a BCS-Leggett like state as identified by Kadanoff and
Martin. T-matrix theories begin with an ansatz for the single particle self
energy and are to be distinguished from $\Phi$-derivable theories which
introduce an ansatz for a particular contribution to the thermodynamical
potential. Conservation laws are equivalent to Ward identities which we address
in some detail here. Although $\Phi$-derivable theories are often referred to
as "conserving theories", a consequence of this work is the demonstration that
these two t-matrix approaches similarly can be made to obey all conservation
laws. Moreover, simplifying approximations in $\Phi$-derivable theories,
frequently lead to results which are incompatible with conservation.
