How to inform employer that I need a transplant

Hi,

Im about 6 months away from needing a transplant, my employer does not know about my condition at the moment. I now feel as though it is the correct time to inform them as im going to start to need days off for testing etc. Does anyone have any tips on how to tell my manager that I have a kidney condition and need a transplant?

Please help.

I didn't find the right solution from the Internet.

References:
www.kidneypatientguide.org.uk/forum/viewtopic.php?f=2&t=15775&sid=8b850447a9a164dc4e7f81ba00be7496
B2B Online Video

Thanks