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 flexible 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;
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;
receiving the cell-containing sample into the sample reacting compartment;
illuminating the cell-containing sample enclosed within one of the compartments on one side of the container with light at a wavelength, thereby creating a light scatter signal, and reading the light scatter signal on the same side of the container;
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 sample in a variable sequence and time delay;
moving at least a portion of the reacted sample between the sample reacting compartment and the sample detection compartment using at least one of the sets of actuators; and
reading an analyte-dependent signal from the reacted sample contained in the sample detection compartment, wherein the analyte dependent signal is a signal other than hematocrit, and using the hematocrit value to normalize the analyte-dependent signal to thereby calculate a test result.
2. The method of claim 1 wherein the reacted sample in the step of reading the analyte-dependent signal is a cell-containing sample.
3. The method of claim 1 wherein the step of illuminating is performed using a light guide disposed in one of the actuators.
4. The method of claim 3 wherein the step of reading the light scatter signal is performed using another light guide disposed in the one of the actuators.
5. 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.