Many methods have been devised for determining blood clotting times. The one most widely used is to
Relation of prothrombin concentration in the blood to "prothrombin time."
that shown in Figure 36-5, is drawn for the method used so that the prothrombin in the blood can be quantified.
Tests similar to that for prothrombin time have been devised to determine the quantities of other blood clotting factors. In each of these tests, excesses of calcium ions and all the other factors besides the one being tested are added to oxalated blood all at once. Then the time required for coagulation is determined in the same manner as for prothrombin time. If the factor being tested is deficient, the coagulation time is prolonged. The time itself can then be used to quanti-tate the concentration of the factor.
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This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.