The present disclosure relates to a medical condensate trap for use in external blood treatment by means of a blood treatment apparatus. The condensate trap comprises an interior； a first connection for connecting the interior in fluid communication to a gas outlet of the blood treatment apparatus； a second connection for connecting the interior in fluid communication to a gas inlet of the blood treatment apparatus； and a third connection for connecting the interior to an air port of a blood treatment device. The blood treatment device may be, for example, a blood tubing set or a blood cassette.
