A blood-viscosity measurement method uses a collection tube includes a bottomed tube having an opening at one end in a length direction and a bottom at the other end in the length direction. A sealing plug includes a sealing part fitted in the opening of the bottomed tube in a hermetically sealed state, a cap part, and a thin connecting part. The sealing part includes a vertically penetrated insertion hole and fitted in the opening of the bottomed tube. The method includes collecting blood using a negative pressure state of the inner space, applying an external force to the cap portion to break the connecting part and removing the cap part to expose the insertion hole at an upper surface of the sealing part, and obtaining blood viscosity by causing a viscosity-measurement falling body to fall from the insertion hole, and measuring a fall terminal velocity of the falling body.

A mobile rheometric device for medical diagnosis of human, animal, or plant samples. Such a mobile rheometric device thus includes a rheological measurement device, to which is connected an evaluation unit having an evaluation program as well as, connected thereto, an output unit. The evaluation unit with evaluation program is configured to classify the measured rheological parameters of a human, animal, or plant sample with respect to at least one medical diagnosis or into relevant parameter groups for a medical diagnosis, so that a detailed view of the sample can be provided to a user of the mobile rheometric device by means of the output unit. A corresponding method is also disclosed.

A wearable non-invasive blood viscosity monitor and methods of using the same are described. The blood viscosity monitor includes first and second sensors configured to sense blood parameters non-invasively from a subject and a processor circuit configured to generate an indication of blood viscosity using the sensed blood parameters from at least one of the first and second sensors and to generate a medical diagnostic using the indication of blood viscosity. An output circuit presents the medical diagnostic to alert a clinician about an elevated viscosity. The first and second sensors may be on the same or different fixation devices and adapted to provide measurements that are mixed and matched by the processor circuit to provide validation of measurements, averaging of measurements, or to select the most reliable data for each modality and measurement context.