In order to qualify for a license, a gym teacher must have a minimum of a bachelor's degree and pass competency examinations covering both general education and topics pertaining to their area of specialty. After a teacher is licensed, they must also meet continuing education requirements set by their state.
Mistake #3: Keeping mixed formula out too long. Formula that is sitting out at room temperature must be thrown away after 1 hour. If it is in the refrigerator, pre-mixed formula (also called ready-to-feed formula) that is opened must be thrown out after 48 hours. Formula that you mixed must be thrown out after 24 hours. Mistake #4: Re-using leftover formula.
My pharmacist advised that the bottle was good for up to 60 days after opening as long as its kept cool. I find no drop off of effectiveness going to 60 days. I believe it is a waste to through it out after 28 days because I still have over 80% of the bottle left after 28/30 days. As stated, and from what I was told. all insulin should be descarded after 30 days of first use.