@ysmina-- An inhibin test is also being used to diagnose ovarian cancer now, isn't it?
I have ovarian cancer in my family history and I remember reading an article about this recently. I don't think checking for inhibin helps diagnose all kinds of ovarian cancer however. I believe it only helps diagnose ovarian cancers that have to do with the egg cells.
I also don't know if this is used as a screening test or a supporting test for the diagnosis. I believe it's fairly new, so maybe the verdict is still out for it.
Inhibin is clearly a really important hormone in the reproductive system though. I'm glad that medical researchers are learning more about its functions and using that towards new diagnosis methods.