It was 24 hours, but I'm still way up there. Yikes! Thanks for the quick reply!
Oh whoops, that's for a normally functioning thyroid. Any clue about the range for Grsves patients?
"Graves disease usually yields RAIU values of 40 to 80% (normal 10 to 30%) at 24 hours. However, high-turn over varieties may manifest only as elevated 4-6 hour RAIU values (normal 4 to 15%), as 24 hour RAIU results may be normal or only mildly elevated."
So, your result is toward the high end of the typical Graves' result.
6 hours 1-16%
24 hours 8-25%
It seems like you're well over range.
http://www.nlm.nih.gov/medlineplus/ency/article/003689.htm