Well from everything I've read 1 or 2 cups probably wouldn't affect your INR, but if you drank 1/2 gallon to a gallon a day then yeah it could have an effect. Go ahead and enjoy your present and just have let them know at the clinic. There should be no need to live your life differently. Just live!!!

Not sure on the white tea, but if you drink it in moderation, I can't see if having that great an impact. I drink green tea almost every day and don't notice any affect on my INR.

When I first read this I thought it was a joke but seems no :(

Im english and drink loads of tea.! (mostly white)

All the things Ive just read say the same as kjc but I drink several cups a day so it looks like Im gonna have to cut down.. i also drink jasmine green tea at work and looks like im gonna have to cut that out completely.. my specialist didnt mention anything about tea at all so Im quite annoyed argh..!!

Im gonna have to hit the lab and develop a safe tea for us all to drink lol

For those who drink it consistently (e.g., a cup or 2 every day), my guess is that it is not a huge deal, even if it does have a bunch of vitamin K (which I am still not sure about- let me know if you know).

Your dose is adjusted to work with your diet and it probably just means you are taking a slightly higher dose of coumadin to counteract the vitamin K you are consuming via tea.

The problem comes if you go on vacation and don't have tea for several days in a row...or if you decide you want to just drink it occasionally.

Btw, I know regular black tea does not affect INR. Green tea does. White tea is unknown.

When I asked at the coumadin clinic, I was told to drink a consistent amount. They said to pick something specific- like 3 cups a week- and stick with it. I don't think I will enjoy my tea if I have to think that carefully about it...

The goal should be to eat and drink what you normally would (with the exception of keeping alcohol to a minimum). Then the warfarin dosage will be adjusted to fit your diet and your lifestyle. When I first started taking warfarin, I had a devil of a time getting therepuetic, so I would try removing vitamin K stuff from my diet. It didn't help and I ended up feeling crappy because I removed a lot of veggies.

Personally,I really think some of the nurses and warfarin clinics get a little carried away with telling people what they can't eat while on warfarin. It's not about that.

I drink tons of tea (white, black, herbal - I do avoid green) and I drink it inconsistently. On the two days/week I teach, I typically have ca. 1-1.5 liters of tea. The other days each week I may have 8oz. or I may not drink any tea. And so on - very inconsistent.

Now... my INR is rarely consistent, too - could be related! Doubtful, though. I think I'm just unlucky in that regard. I say go for it! And I agree - when I stress something too much, I don't enjoy it as well!

Not really sure, some say that the white tea may go through "less" processing and therefore have more vitamin k than green tea.

My doctor always says just plan your diet and we will adjust your coumadin to meet the need for my INR.

Good luck

I have done some research and posted the answer on a website I manage:
http://hubpages.com/hub/CoumadinQuestions

Thanks, Solta.
Your site looks great. I will be sure to keep an eye on it for useful info. Thanks.
So...I guess the answer is that the USDA doesn't have the data. Bummer.

I can't help but wonder if there is data in the UK or China...places where they drink more tea than the US?