Question 29

Increased bleeding time

A patient who has been taking warfarin is expected to have an increased bleeding time due to the anticoagulant effects of the medication, which inhibits the synthesis of vitamin K-dependent clotting factors.

A) Fasting requirement

This option is incorrect because there is no fasting requirement specifically associated with patients taking warfarin. While certain tests may require fasting, the use of warfarin itself does not necessitate this condition.

B) Alternate antiseptic required

This option is also incorrect. There is no indication that a phlebotomist would need to use an alternate antiseptic for a patient on warfarin. Standard antiseptics can still be used safely for venipuncture.

C) Increased bleeding time

This option is correct, as warfarin therapy directly affects the blood's ability to clot, leading to prolonged bleeding times. Phlebotomists must be aware of this to manage the procedure carefully and anticipate potential complications.

D) Specimen placed on ice

This option is incorrect since placing the specimen on ice is not a standard requirement for blood drawn from patients taking warfarin. Specimen handling depends on the type of test being performed, not the medication the patient is on.

Conclusion

The correct answer, increased bleeding time, highlights a critical consideration for phlebotomists working with patients on anticoagulant therapy. Other options do not align with the specific implications of warfarin on blood coagulation, reinforcing that understanding the effects of medications on laboratory procedures is essential for patient safety and accurate test results.