Wednesday, 7 September 2011

Holidays and Timezone Changes

I always test and dose at 9pm every day.  Going on holiday or business trips has enough capacity to disrupt warfarin without forgetting a dose, so I decided to timezone adjust my dose to keep it at 9pm.

On this occasion I'm going to Bangkok, and i'm taking something around 8mg daily.  Bangkok is 7 hours ahead of home, so I worked out my dose assuming 8mg is over 24 hours like this:

8/24 = 0.333  x 17 = 5.66.  So I need a 5.6 dose instead of 8.

Then when I return I do the opposite:

8/24 = 0.333  x 31 = 10.3.  So I need a 10.3 dose instead of 8.

Here's an example, results and doses:

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