A patient is stabilized on warfarin therapy and being monitored using the prothrombin time (PT) followed by calculation of the international normalized ratio (INR) .The formula for calculating the INR is:
INR = (PTₚₐₜᵢₑₙₜ/PTₙₒᵣₘₐₗ) ᴵˢᴵ (where ISI = international sensitivity index)
What is used for the PTₙₒᵣₘₐₗ?
A) arithmetic mean PT for the control
B) geometric mean PT for the reference population
C) arithmetic mean PT as found in a standard reference textbook
D) geometric mean PT reported by the manufacturer of the PT reagent being used
Correct Answer:
Verified
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