PERT with EN: dependent on type of feed used, dependent on location of feeding tube, gastric: suspend microspheres in acidic thickened fluid (mildly thick orange/apple juice), ENFIT (doesnt work well with PERT), jejunal: crush microspheres, activate with bicarb/flush with water (calculate how much fat someone is getting over 4 hours and dose accordingly), can utilise elemental/semi-elemental formula