The nurse reviews the patient's lab values and determines warfarin therapy is at therapeutic levels with what lab result?
A) Partial thromboplastin time (PTT) 1.5 to 2.5 times the control
B) Prothrombin time (PT) 1.3 to 1.5 times the control
C) International normalized ratio (INR) of 3 to 4
D) Activated partial thromboplastin time (aPTT) 3 to 4 times the control
B
Feedback:
Warfarin is at therapeutic level when the INR is 2 to 3.5 and the PT is 1.3 to 1.5 times control. PTT and aPTT should be 1.5 to 2.5 to indicate heparin dosage is at therapeutic level.
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Which of the following is the primary factor in uteroplacental blood flow?
A. Fetal heart rate B. Maternal cardiac output C. Maternal oxygen consumption