CMT is really nothing more than a screening. If used regularly on each doe in the herd, it can alert you to a difference in the milk. A doe who usually doesn't gel, who gells thickling has something going on, more somatic cells in her milk....late lactation or in heat or mastitis.
Lopsided udders with normal milk is nearly always staph, its usually the only clue there is even a problem. I can feel in the udder a thickened skin and also a poor keeping quality of the milk.
True mastitis, is mast = breast....itis is inflammation of, so mastitis is a hot infammed udder milking cottage cheese, stringy bloody or pussy or nasty milk. The udder is painful, so much so sometimes the doe will not walk, or jump up on the milkstand.
So if you are just looking at a lopsided udder, that was not caused by kids nursing one side and not the other than yes it's like subclinical staph. Treating is always more expensive than sending in a milk sample for a test...info on LSU mastitis facility is in goatkeeping 101. Then if it comes backpositive for staph...vaccinate with lysigin, give pennicillin and gentamycin (you can order the pig kind in QCsupply.com and infuse, any dry cow except erythromicin in which you are going to put gentamycin in the infusions also. Then when you dry her up you will dry cow on more time about 50 days from kidding.
Never dry up a doe with mastitis. Vicki