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This condition could most possibly be a diabetic condition only. By determining sugar levels any time will not be of much use.
You must give a fasting sample and a post breakfast or post lunch sample in a lab,after they give you a glucose load. this test is called GTT
or glucose tolerance test
which will suggest any impaired glucose tolerance
or even diabetes
.You may also need to get the urine samples collected and tested.
On ruling out diabetes, we can proceed further.