A repeat glucose is usually performed...
...Slightly off topic but there's nothing worse than a worried
looking nurse or quack calling you back for another test you
just done. In SE Asia the buggers have a predilection for not
giving you the reason - just shuddup and do the test again.
One was a repeat ECG - didn't THAT freak me out! Turns out
the machine was duffly calibrated being the first run of the
day but they didn't bother telling me all that. Everything ok
thank christ on the second.
Another was a repeat chest Xray. This one was because their
stupid machine wasn't preloaded! But before I found that out
the bloody nurse stared at me the whole time as if I have just
been condemned to the gallows.
Had to do the odd re-piss now and then but since my urine is
as pure as freshly driven snow I knew it was only because of
a corpuscle count due to age. Another guzzle of water and a
pee one hour later clears up most noises from the quackery.