Itswindy - as HF says, there is an element of confusion in your query.
If you have 'DH' for precision apps you should also have 'MDH' for NPAs which means you are using QFE.
If you have 'MDA' you should have 'DA' which means you are using QNH.
I assume 'MSA' is a typo?
To my knowledge I do not know of MDA (or MDH) EVER being set for a CAT1 ILS.
One can, of course, set RadAlt DH when flying to MDA.