Prothrombin times are done daily. Mr Drummond's doctor adjusts his dosage of warfarin sodium accordingly. He responds we

[answerhappygod]

Prothrombin times are done daily. Mr Drummond's doctor adjusts
his dosage of warfarin sodium accordingly. He responds well to
therapy and is discharged from hospital with a prescription for
warfarin sodium 5 mg PO daily.
Given your knowledge of this medication, explain
the laboratory testing that is required to monitor the
effectiveness of warfarin? How does this impact on the dosing of
this drug?
(Note: Your answer should take into consider David's medical
history and all medication received. Remember to
incorporate latest evidence based practice in your answer)