Diagnostic device and method
View Patent ↗A method of separating a cell-containing sample into a substantially cell-depleted portion, and a cell-containing portion comprising at least one of a stem cell, a lymphocyte, and a leukocyte comprises a step in which the sample is received in a vessel with at least one flexible wall. In another step, an additive and particles are added to the sample, wherein the additive substantially binds to the at least one of the stem cell, lymphocyte, and leukocyte, and the particles and wherein the particles substantially bind to the at least one of the stem cell, lymphocyte, and leukocyte, and the additive, thereby producing a cell-containing network. In a further step, the network is separated from the substantially cell-depleted portion by applying a magnetic force.
1. A method of testing a cell-containing sample for an analyte, comprising:
providing a container having a plurality of fluidly discontinuous compartments, including a sample reacting compartment, different first and second reagents contained in first and second reagent compartments, respectively, and a signal detection compartment;
receiving the cell-containing sample into the sample reacting compartment;
illuminating the cell-containing sample in the container at a wavelength thereby creating a light scatter signal, reading the light scatter signal, and automatically calculating a hematocrit value using the light scatter signal and a predetermined linear relationship between reflectance and the hematocrit value at the wavelength;
contacting a surface of the container with a device having a plurality of actuators;
operating multiple different sets of the actuators to independently add the first and second reagents to the cell-containing sample in a variable sequence and time delay;
moving at least a portion of the reacted cell-containing sample between the sample reacting compartment and the sample detection compartment using at least one of the sets of actuators; and
reading an analyte-specific signal from the reacted cell-containing sample contained in the sample detection compartment, wherein the analyte-specific signal is a colorimetric, luminometric, or fluorimetric signal, and calculating a test result using the analyte-specific signal and the light scatter signal.
2. The method of claim 1 wherein the step of illuminating is performed using a light guide disposed in one of the actuators.
3. The method of claim 2 wherein the step of reading the light scatter signal is performed using another light guide disposed in the one of the actuators.
4. The method of claim 1 wherein the step of illuminating is performed using light having a wavelength maximum at between 620 nm and 660 nm.
5. The method of claim 1 wherein the container has a flexible top sheet and a flexible bottom sheet, wherein at least one of the compartments is formed by the flexible top sheet and bottom sheet, and wherein at least a portion of the top sheet and bottom sheet is transparent.