From the TSA website,
http://www.tsa.gov/public/display?theme=83&content=453
Persons with Diabetes
Notify the screener that you have diabetes and are carrying your supplies with you. The following diabetes related supplies and equipment are allowed through the checkpoint once they have been screened:
- insulin and insulin loaded dispensing products (vials or box of individual vials, jet injectors, pens, infusers, and preloaded syringes),
- unlimited number of unused syringes when accompanied by insulin, and
- lancets, blood glucose meters, blood glucose meter test strips, insulin pumps, and insulin pump supplies.
Insulin in any form or dispenser must be properly marked with a professionally printed label identifying the medication or manufacturer's name or pharmaceutical label.
Notify screeners if you are wearing an insulin pump and, if necessary, advise the screener that it cannot be removed since it is surgically implanted.
Insulin pumps and supplies must be accompanied by insulin with professionally printed labels identifying the medication or manufacturer's name or pharmacy label.
Advise screeners if you are experiencing low blood sugar and are in need of medical assistance.
It is recommended that used syringes be transported in your checked baggage; however, when used syringes need to be in carry-on, ensure they are in a hard, plastic-capped container (i.e. sharps disposable container) for safety and containment.