The nurse is reviewing the laboratory results from a patient who has been diagnosed with liver disease. Which finding would be consistent with this condition?
a. Prothrombin time (PT) 12.4 seconds
b. Prothrombin time (PT) 10 seconds
c. Partial thromboplastin time (PTT) 64 seconds
d. Partial thromboplastin time (PTT) 74 seconds
e. Partial thromboplastin time (PTT) 55 seconds
B
Prothrombin is a protein produced by the liver and used in blood clotting. The normal value is 12 to 14 seconds. It is reduced in patients with liver disease, causing a prolonged clotting time. Par-tial thromboplastin time (PTT) is used to detect deficiencies of stage II clotting mechanisms. It is prolonged in liver disease.
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