The issue of testing CPT invariance at a B factory is considered. We p
resent asymmetries that permit a clean extraction of quantities parame
trizing direct and indirect CPT violation, using information from Y(4S
) decay via coherent B-d $$($) over bar B-d pairs into various final s
tates. Estimates are given of the bounds on CPT violation that could b
e obtained in present and planned machines.