hi cpaq, welcome to the group. you can use nearly anything to make a quilt. if you are going to mix your scrubs with cottons I would prewash the cottons to shrink them. the scrubs will not shrink up any more and you want the fabrics to match, shrink-wise. other than that you should be good to go.
batting, you need to decide what weight you want. do you want a heavier quilt or a throw-type quilt. do you want a flat look or a puffy look. that is how you determine what batt to use, how do you want your quilt to look.
backing, nearly anything would work. I tend to stick with cotton when working, it doesn't give you as much trouble. the poly blend and cotton will wear at different rates. I don't know that this is a big issue.
gini in north idaho
First of all, welcome cpaq, I too am in the Medical profession. I have I bet 100 Print, beautiful scrub jackets. I am saving them to make a quilt someday, too pretty, and expensive to throw out. Gini, thank you for answering that question, even though I should know the answer, it just didn't come to me! Now I also will wash any other fabric I use with my jackets. Hummm. Unless I use the scrubs, the solid ones I gave in every freakin color! Great idea cpaq! I have made a quilt for a surgeon before, using his scrub caps, he collected them, but not scrubs! Thanks to you both for that lightbulb moment!!
Welcome cpaq13! You'll love being on QCA. Let us know if you have any questions about the site. Several of us have been here for awhile and love to help. I also love reading about what everyone if doing. So much inspiration here!