The BioPAT® Trace Membranes Dialysis Bypass for glucose/ lactate, with lower measuring range for the stainless- steel bypass module/ PEEK comes in a package of 5 pieces. The membrane can be used in both systems, BioPAT® Trace and BioPAT® Multi Trace. As well as in Biostat RM® for low glucose control (0.1-7 g/L). The membrane is absolutely required for the functionality.