Apparatus for monitoring blood coagulation

An apparatus for monitoring blood coagulation comprising:

• a main body;
• a test chamber for receiving a fluid sample;
• and
• a rotor disposed within the test chamber centralized between a lower pivot point and an upper pivot point, but not tethered to the upper and lower pivot point,
• wherein the rotor comprises a buoyancy chamber for reducing the apparent weight of the rotor when fluid is arranged within the test chamber,
• the main body and test chamber form a capsule characterized in that the main body comprises an inlet connected to a feeder channel leading into a lower channel via which the fluid sample can be inserted into the test chamber and in that the main body further comprises, at a top of the test chamber, a ventilation aperture leading to a short ventilation gallery comprising a vertical shaft leading to an upper substantially horizontal channel via which excess fluid sample and air can exit the test chamber into an overflow reservoir.