How much liquid should be in the tube?

The tube contains a small amount of liquid that only fills the bottom, as illustrated below. The amount of liquid may not look exactly like the photo in the User Instructions. The liquid in the tube should cover the bottom of the swab and test strip when immersed. The entire swab tip and arrows on the test strip do not need to be completely covered by the liquid. Please ensure to stir the swab 3-4 times in the liquid before the 1-minute incubation step.

Examples of tubes and expected liquid solution levels: