I always put mine in my hand luggage never had any problem, if they do inspect my bag I always tell them my diabetic testing kit in in there but doesn't have any loose sharps in it.
the hold of a plane might be too cold for test strips?? (the test strips i use shouldn't go below 2'C or above 32'C)
Never let yourself get physically separated from
- your glasses
- clean underwear
- medication
- test kit
- emergency contact details, including your destination address and phone number
- your travel insurance and other documentation