I am working with Oasis 19 for 5 months now. You can enter you audiogram in the client database. Then in the Oasis programming environment you can use that or you can do an in-situ audiogram. You use your hearing aids in your ears to measure what your hearing threshold levels are. My audiologist agrees that it is more precise than the audiogram they measure with headphones, since the complex of you-with-those-aids are measured. ‘Precision’ is relative, because the measuring error is still 10dB. Don’t be surprized if you see differences between audiograms within that range. Apparently our ears are not that precise.
If your hearing aids generate painful/uncomfortable sounds at times, you can even measure the level at which sounds become uncomfortable. Then MPO is than automatically adjusted. As I have a two-year-old with a rather loud voice—Happiness is around 82dB, I never measured her when she’s upset because it’s painful— this is a life saver!
My audiologist never did a REM. If yours did and you can get a paper printout of it, you could input it in the program, though.