My son's INR is elevated and they think it is because of pickles? What is the correlation?

Probably has to do with the tumeric and garlic (both blood "thinners")used in making pickles. You shouldnt let him drink pickle juice. It is VERY high in sodium and very hard on the stomach lining. It is basically brine. There are a lot of anecdotal stories on the web that say pickle juice is good for you (perhaps in small amounts if you have been perspiring heavily) but science doesnt really back that up. Anything that high in sodium should give you pause. If he really has to have pickle juice, make sure it is no more than a sip or two per day and it is best to add water to make it half and half or have him drink an 8 oz glass of water for every couple oz of pickle juice..

I don't know if pickles are high in vitamin K. Have they checked his liver function? Vit K is a fat soluable vitamin which means you need fat to absorb it. Does he have chronic diarrhea? One way to find out if its pickles is to stop eating them and drinking the juice. He could be filling up on pickles and not eating things he needs in his body.