Some tests start before then also! There is a phenomenon called the "dawn phenomenon", which results in elevated sugars, following a big low during the fasting period. They would like to catch you before that happens, since once the liver starts making and releasing glucose for that day your fasting numbers will change even though you didn't eat anything.
A HbA1C is good to have as well, since it gives an average of several months of blood sugar highs. There are charts corresponding to it to estimate the daily average readings.
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Weezie looking at petunias 8.25.2017
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