A1C is the test you want if you are “concerned.”
A blood glucose test is impacted by just about everything. I test my BG about 5 times a day. If you eat a single cookie it will spike up. If you expertise it will spike up. If you eat something late the night before, it could pop up in the morning.
An A1c looks at the glucose that has attached itself to your red blood cells. A red blood cell will last about three months. So, if you have a lot of glucose in your system all the time your A1c will be high. If you spike from ice cream once a week, your A1c will be fine.
A random reading of 104 without a lot of context isn’t worthy of a comment.
A1C gives you an average blood sugar over a 3 month period.
Would a condition that kept red blood cells circulating for longer than 3 months affect this reading?