Epi and fat enzime poop test relationship

When on pert treatment will the fat exzyme poop test numbers stay low or over several months go back up, ex mine started 145 then 3 months later went to 450, then 3 months later 734? Dr says should stay low! On two-three creon 36000 per meal, one creon per snack. Took over a year to stableize.