Can treatment be changed based on one measurement?
Under no circumstances should the treatment regimen be changed based on the results of one test. The exception is emergency situations. Remember that, firstly, there is always a possibility of error. Secondly, in both healthy and diabetic people, blood sugar levels are subject to various fluctuations during the day. To get a correct idea of diabetes compensation, you need test results throughout the day, and not just in the morning.
Although, unfortunately, clinics still maintain the practice of testing blood sugar levels only once - in the morning.
Let's remember the "dawn" phenomenon, which consists in the fact that in the early morning hours the need for insulin increases. Therefore, at 8 a.m. the blood sugar level may be higher than at 6 a.m. If the patient does not know anything about this, he may decide that his condition has worsened and make unjustified treatment adjustments.
Or, on the contrary, he will be delighted with the result of 10.0 mmol/l of blood donated on an empty stomach for sugar, deciding that he is leading a completely correct lifestyle, without even knowing how high this figure is. When the blood sugar level is 10.0 mmol/l after a meal, this is more or less nothing. But when such a result is obtained after sleep, after a night break in nutrition, one can only imagine what it was like in the evening, after dinner. Surely no less than 13.0-16.0 mmol/l.
Only multiple checks (for three days in a row, several times a day) will help identify this or that pattern and carry out the appropriate correction.