Method of setting up a flow cytometer
AssigneeCaribbean Microparticles Corporation
InventorAbraham Schwartz
Life of this patent
Estimating the term…
Abstract
A method of setting up a flow cytometer using microbeads fluorescing at a plurality of wavelengths, control cells for each of said wavelengths, certified blank microbeads. The blank microbeads are run and the PMT voltages are adjusted so that the blank microbeads are on scale on the flow cytometer. The control cells are run and the photomultiplier tube voltages are adjusted so that the single population falls in selected channels. The fluorescent microbeads are run on the flow cytometer and the Target Channels for the flow cytometer are determined.
Claims11
A method of determining Target Channels for a flow cytometer having photomultiplier tubes (PMTs) with adjustable voltages, adjustable compensation circuit and a plurality of fluorescence channels, at each of at least two wavelengths such that the noise level is on scale and the compensation is uniform across the intensity ranges of the said fluorescence channels for use with fluorescent-labeled cells fluorescing at a plurality of wavelengths, comprising:
- (a) providing blank microbeads;
- (b) providing a set of control cell populations for each of said wavelengths, each control cell population being singly labeled with a fluorescent compound which fluoresces at one of said wavelengths;
- (c) providing a population of microbeads fluorescing at said wavelengths;
- (d) running the said blank microbeads on said flow cytometer and adjusting the PMT voltages so that the blank microbeads are on scale on the flow cytometer;
- (e) running said control cell populations for each said wavelengths on said flow cytometer and gating the control cell population to yield singlet cell populations;
- (f) adjusting the compensation so that the singlet cell populations fall orthogonally to unstained cells in secondary fluorescence channels;
- and
- (g) running said population of microbeads fluorescing at said wavelengths and determining Target Channels for the flow cytometer.
A method of setting up and subsequently maintaining a common Window of Analysis for numerous models of flow cytometers having photomultiplier tubes (PMTs) with adjustable voltages, adjustable compensation circuit and a plurality of fluorescence channels, at each of at least two wavelengths for use with fluorescent-labeled cells fluorescing at a plurality of wavelengths, comprising:
- (a) determining Initial Target Channels by:
- (i) providing blank microbeads;
- (ii) providing a set of control cell populations for each of said wavelengths, each control cell population being singly labeled with a fluorescent compound which fluoresces at one of said wavelengths;
- (iii) providing a population of microbeads fluorescing at said wavelengths;
- (iv) running said blank microbeads on said flow cytometer and adjusting the PMT voltage so that the blank microbeads are on scale on the flow cytometer;
- (v) running the control cell populations for each of said wavelengths on said flow cytometer and gating the control cell population to yield singlet cell populations;
- (vi) adjusting the compensation so that the singlet cell populations fall orthogonally to unstained cells in secondary fluorescence channels;
- (vii) turning the compensation circuit off;
- (viii) running said population of microbeads fluorescing at said wavelengths and determining Initial Target Channels for the flow cytometer;
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- (ix) calculating equivalent Initial Target Channels for flow cytometers which have different amplifiers and scales;
- (b) determining Instrument Specific Target Channels by:
- (i) running said population of microbeads fluorescing at said wavelengths with the compensation off and adjusting the PMT collages to place the fluorescing microbeads in said Initial Target Channels;
- (ii) running the control cell populations for each of said wavelengths on said flow cytometer and gating the control cell population to yield singlet cell populations;
- (iii) adjusting the compensation so that the singlet cell populations fall orthogonally to unstained cells in secondary fluorescence channels;
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- (iv) running said population of microbeads fluorescing at said wavelengths and determining the Instrument Specific Target Channels;
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- (c) subsequently using the Instrument Specific Target Channels by:
- (i) adjusting PMT and compensation settings to those determined in section (b);
- (ii) running said population of microbeads fluorescing at said wavelengths and determining if said microbeads fall in said Instrument Specific Target Channels and thus if said instrument is performing as determined previously;
- (iii) running the control cell populations for each of said wavelengths on said flow cytometer, gating the control cell population, and determining if the singlet cell populations fall in the same positions as previously and thus indicating said cells, or reagents or preparation are unchanged;
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- (iv) running said blank microbeads on said flow cytometer and determining if the blank microbeads have a lower fluorescence than the unstained cells and thus that the flow cytometer noise level will not interfere with assay.
A method of determining whether compensation circuits of a flow cytometer have been correctly set up, said flow cytometer having photomultiplier tubes (PMTs) with adjustable voltages, adjustable compensation circuits and a plurality of fluorescence channels, at each of at least two wavelengths for use with fluorescent cells for use with selected cells being fluorescently labeled to fluoresce at a plurality of wavelengths, comprising:
- (a) turning said compensation circuits off;
- (b) running blank microbeads on said flow cytometer and determining peak channels for said blank microbeads in said fluorescence channels;
- (c) running unstained cells on said flow cytometer and determining peak channels for said unstained cells in said fluorescence channels;
- (d) determining whether there is a lower fluorescence intensity for the blank microbeads than the unstained cells and therefore that flow cytometer noise will not interfere with a cell assay;
- (e) turn said compensation circuits on;
- (f) running blank microbeads on said flow cytometer and determining peak channels for said blank microbreads in said fluorescence channels;
- (g) running unstained cells on said flow cytometer and determining peak channels for said unstained cells in said fluorescence channels;
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- (h) determining whether said blank microbeads have a higher fluorescence intensity than the unstained cells, and therefore that the compensation circuit requires adjustment.
Dependencies are inferred from the claim text.