The Minus Sign
A functional control showing that the sample has run through the test correctly.

The Positive Control
Demonstrates the functionality of the antibodies that detect hCG. It will always be produced in a valid test whether or not hCG is present in the sample.

End of Assay
Indicates the test is ready and must be read immediately – no need for a timer

The Negative Control
Indicates a non-specific binding entity in the sample that could cause a false positive result.