Can you be in DKA with a normal blood sugar?

A blood glucose level of 164 mg/dL would NOT cause you to be in DKA (Diabetic Ketoacidosis), my friend.

I agree with formerly_bob that you would notice other symptoms, like peeing as though it were going out of fashion and drinking excessively before you went into DKA.

You should test either your urine or blood, if your blood glucose meter can test for ketones too, when your blood glucose level reaches 250 mg/dL.

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My son is type 1 he went into dka with blood sugars around 170-185 area. Sometimes with the flu or other illness dka can creep up on you. Definitely check for ketones

I'm sorry to hear about that but what the heck happened? How did he got to this level of blood sugar?? Anyway, the normal blood sugar level is, as said before, 60 to 90 and even 100. All the best for him.

Whatever you have, its not DKA, especially since your glucose has been both high and low and you are taking extra insulin. You would notice excessive thirst and frequent urination before any serious symptoms developed.

You actually can. It is very rare (about 1% of cases). It's called euglycemic diabetic ketoacidosis. That is why they tell type 1s to test for ketones even when your glucose is in normal range when you are sick.