I just take a heaping spoonful and mix it with water twice a day, morning and night. I would guess each serving is a little over a tbsp. I'm also using a brand called "Now Foods" which is like $8 off amazon. Originally the plan was to gradually switch to a more expensive brand but I've had so much improvement with Now I dont want to change anything.
I don't have insurance (immigrant from Brazil so not covered by obamacare) so I don't know how feasible it is to get a swab. So far my experience has been overwhelmingly negative at doctor's offices. I think the conclusion or at least hypothesis I've adopted is that this is a symptom of digestive health problems. Accutane is known to incite digestive problem and colostrum heals the gut.