Abstract: A method for performing time resolved homogeneous assays using a long-lifetime luminescent dye as a donor. A reaction well containing a sample portion, donor reagent, and acceptor reagent and a matrix well containing a sample portion and donor reagent are excited and the resulting emission from each is measured at a single wavelength associated with the acceptor. The measurement obtained from the matrix well is used to provide a correction for the measurement obtained from the reaction well. The sample may be a biological fluid such as an oral fluid.

Abstract: A sample collection container adapted to be connected to, and disconnected from, a sample collection adapter and a sample collection container cap. The sample collection adapter has a downward sloping interior surface that provides a free-flowing path for samples provided by a subject to the sample collection container. The sample collection adapter may have a three-dimensional rim that is curved in two different non-parallel planes.