Safe Muga Score

[Patb]

To all who know a lot more than I, what is a safe Muga score. I had 4 A/C with
a muga score of 72, which they said was probably an error and not that high.
Then before Herceptin started, my Muga was 58, and then after 3 months of Herceptin, it was 55 but the Dr. said still ok for Herceptin. I came to Fla for the
winter and the Dr. said ok for now but would like to do an echo in a few weeks.
Can you compare an echo with a muga and what is a good score for an echo.
There is so much to worry about and of course, we all need our heart.
patb

Diagnosed in June, Stage I, No Nodes, Grade 3, ER+PR-, Her2 positive, 4 A/C's
33 Rads for Lumpectomy, and now Herceptin every two weeks. Thanks