| 摘要 |
<p>A method of determining the sedimentation rate of blood, in which a so-called blood sedimentation tube is filled with whole blood which is allowed to settle for a period of one hour, whereafter the height of a plasma column above the blood sediment is read-off. The invention is characterized by inserting the test tube (1) into a reading location (4) in which a plurality of electrodes are disposed along the vertical extension of the tube (1); supplying to the electrodes a signal of varying voltage; determining the impedance of the blood (2, 3) present in the tube (1) between pairs of electrodes (5, 6); determining the location along the vertical extension of the tube (1) at which a change in impedance has occured, using herefor the fact that an impedance difference prevails between plasma (2) and blood sediment (3) respectively; and by determining the vertical distance from the aforesaid location to the upper surface (14) of the plasma column (2). The invention also relates to apparatus for carrying out the method.</p> |
