A monitoring method for measuring a quantity of blood lost by a woman having given birth vaginally, this method including collection of post-partum blood flow in a container (42), wherein this method includes at least the following steps:
- a) automatically and continuously weighing (1002) a quantity of blood present in the container (42);
- and
- b) automatically computing (1004A) a volume (Vb) of the blood present in the container, based on a weight (W) determined at step a);
- c) automatically computing (1004B) a flow rate (Fb) of the blood flowing into the container, on the basis of variations of the volume computed at step b);
- and
- d) displaying (1008) both
- o a first value of the volume (Vb) computed at step b), o a second value of the blood flow rate (Fb) computed at step c).