Question 74

Increased bleeding time

Patients taking warfarin are at a higher risk of prolonged bleeding times due to the anticoagulant effects of the medication, which inhibits the synthesis of vitamin K-dependent clotting factors.

A) Fasting requirement

A fasting requirement is not specifically relevant to patients on warfarin. While some laboratory tests may require fasting, warfarin itself does not necessitate fasting before blood draws.

B) Alternate antiseptic required

There is no need for an alternate antiseptic when drawing blood from a patient on warfarin. Standard antiseptics are sufficient for maintaining sterility during the procedure, regardless of the patient's anticoagulant medication.

C) Increased bleeding time

Warfarin significantly affects the coagulation cascade, leading to increased bleeding time. This is a crucial consideration for phlebotomists as they need to be prepared for potential complications during blood collection.

D) Specimen placed on ice

Placing a specimen on ice is not a standard requirement for patients on warfarin. While certain tests may need to be handled at specific temperatures, this does not pertain to the effects of warfarin on bleeding.

Conclusion

Increased bleeding time due to warfarin is a critical factor that phlebotomists must anticipate, making option C the correct choice. The other options do not directly relate to the implications of anticoagulation therapy, reinforcing that they are not relevant in this scenario. Understanding the effects of anticoagulants like warfarin is essential for ensuring patient safety during blood collection.