How to pronounce English abbreviations? How to pronounce? Is there any pattern?

Common abbreviations, such as I'M, can be read directly. If it is a well-known abbreviation, such as int 'l, BTW, you can also read the original words directly. If you can read it according to the pronunciation, you can read it directly as a word, such as ASAP, as a word or as a single letter. However, words in medical and other professional fields can't be read according to phonetic symbols, so there are only words.