The lipid composition is consistent with the presence of chylomicron material and this finding in PD fluid suggests a lymphatic fistula. Chylomicrons can be demonstrated by standing the fluid overnight in the fridge, which will give a milky surface layer with a clear infranatant. The intermittent nature of this problem may relate to food intake during dialysis. ************************************ Home Address: Dermot Neely 52 Albert St Durham DH1 4RJ Tel. 0191-384 6125 Work Address: Dr R.D.G.Neely BSc MD FRCP FRCPath Department of Clinical Biochemistry Dryburn Hospital North Road Durham DH1 5TW Tel. 0191-333 2440 Fax. 0191-333 2679 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%