It has been my experience that you can stretch the shelf-life a bit, but once they are open I wouldn't stretch it much. I've used different kinds and the plastic containers generally hold 50, sometimes 25. Using 3-4 a day I don't generally have a problem. Checking as infrequent as you do is probably not wise since you have strips anyway. I used to use a brand wherein each strip was hermatially sealed, so it must be an issue with some brands. Your endo doc is the word I would seek and adhere to however...
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