Visitors of all ages arriving in Canada by air require a passport or passport equivalent, such as a NEXUS card. If you need a passport right away, get a passport within 24 hrs with Rushmypassport.com.
OTC means Over the Counter, which is a test that you can buy at the store and do not need a prescription for. Many medication are called OTC which means you can just go by them without a doctor's prescription. Or it could also be an OTC stock trade.
The fecal immunochemical test (FIT), also called an immunochemical fecal occult blood test (iFOBT), tests for occult (hidden) blood in the stool in a different way than a guaiac-based test. This test reacts to part of the human hemoglobin protein, which is found in red blood cells.