muga scores

[juanita]

I am not really sure what a muga scan does, but I was wondering what a good score from it would be. I see where some of you had to quit herceptin when your score got down in the 40's and 50's, so I get that is low. But what is a good score? My first one was 66. Then I did just 2 of the tac before quitting that onc, switched to 33 rads, and found a new onc who did 6 cmf. After all of that and before herceptin my score was 67. I've had the muga every three months and the last one was 64. Is that good?