A number of improvements relating to methods and apparatuses for kidney dialysis are disclosed. These include checking of dialysate bypass status using flow measurement; using a flow sensor to confirm the absence of ultrafiltration during bypass; automatic testing of ultrafiltration function by removal...http://www.google.de/patents/US5486286?utm_source=gb-gplus-sharePatent US5486286 - Apparatus for performing a self-test of kidney dialysis membrane
