Which of the following should a phlebotomist anticipate for a patient who has been taking warfarin?

Fasting requirements are generally related to specific tests, such as glucose or lipid panels, rather than the use of anticoagulant medications like warfarin. While certain tests may necessitate fasting, it is not a direct consequence of warfarin therapy, making this choice irrelevant in the context of phlebotomy for a warfarin patient.

The choice of antiseptic used during venipuncture is typically standard, with alcohol or chlorhexidine being common options. The use of warfarin does not necessitate a change in antiseptic, as it does not affect the skin's microbial flora or the risk of infection, rendering this option incorrect.

Placing specimens on ice is usually required for specific tests to preserve analytes, such as some hormones or gases. Warfarin therapy does not influence this requirement; therefore, this choice is not relevant to the management of a patient undergoing blood draw while on anticoagulation therapy.