I have done a considerable amount of long-distance travelling across several time zones in the last few years and have some very useful tips for successful management of Warfarin and INRs.
1) If changing time zones, buy a digital watch and keep it on UK time. Set the alarm to beep at the usual time you take warfarin, so you never miss a dose or under/overdose wherever you are in the world.
2) Make sure your insurance company has APS as a pre-existing medical condition and named on your policy.
3) If travelling to a non-English speaking country, Google 'Antiphospholipid Syndrome' in that language and print it, so you can hand the info to medical people if you need to and it's all explained in their language.
4) Make sure your contact/medical details are easily located in your bag/purse/passport/medical bracelet etc.
5) Get GP/hospital to write a cover note if you have to take pre-loaded syringes through customs.
6) Take a double amount of tablets with you.
7) Be aware that long distance travel and changes in diet and drinks do affect your INR.
8) Make sure you have enough test strips with you for your self-testing machine and it is protected in bubble wrap in transit. Keep it in your hand luggage.
9) If you need to seek and pay for medical support, make sure you get all the documents to give to your insurance companu when you get home.
I hope this is helpful! If I think of anything else, I'll write another blog!