Proper specimen collection for coagulation testing must be performed to eliminate contamination of substances that will interfere with the test results. Which of the following are considered contaminants for coagulation testing?
a. Sodium citrate and heparin anticoagulant
b. Tissue factor and anticoagulant carryover
c. Air and tissue factor
d. High hematocrit and anticoagulant carryover
Question 2
A patient has a prolonged APTT with a normal PT. There were no errors in specimen collection. What does this mean for the patient?
a. There could be a defect in the intrinsic pathway.
b. The patient is on Coumadin.
c. The patient has developed an inhibitor to a factor in the extrinsic pathway.
d. The patient has a vitamin K deficiency.
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