Prothrombin time (PT) is a coagulation test performed to measure the time it takes for a firm fibrin clot to form after tissue thromboplastin (factor III) and calcium are added to a sample of plasma.
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1 The teacher will have the students think about the sentence they are reading and decide what word will go best in the blank. 2  The teacher will call on students to share the word they came up with the class. 3  The teacher will reveal the covered word with the students.