Testing method

A base assembly for a testing kit comprises: a smart phone holder; a vial holder; and a vial storage area. The base has: a depth sufficient that when a smart phone including a camera is disposed within the smart phone holder, the smart phone is far enough away from a vial held in the vial holder that at least the vial can be imaged by the camera at a known distance and location relative to the camera. The base has a width sufficient that the holder can accommodate the smart phone and that the base can store a vial laid flat on the base during transport. The base has a height sufficient that the smart phone holder can maintain the smart phone upright within the holder, that the vial holder can maintain the vial upright within the vial holder during sample collection and that the base can store a vial laid flat on the base during transport.