The present invention provides labeling method for Array Tomography (AT) and immunohistochemistry (IHC) that enables automated analysis many tens-to-hundreds of proteins in a manner that minimizes tissue degradation, increases data fidelity, and substantially increases throughput and reduces cost. Also included are methods for automated acquisition of AT and IHC data.

A method for the identification and quantification of the expression of membrane receptors present on the surface of target cells using at least two soluble receptor binding ligands derived from the soluble part of the glycoprotein of an enveloped virus that interacts with a cellular cognate receptor, the receptor binding ligand containing a part or the totality of one of the receptor binding domains (RBD) of the glycoprotein, and the soluble receptor binding ligand being liable to interact with the at least one membrane receptor of a target cell, for the identification and quantification of the expression of membrane receptors present on the surface of target cells, the identification and quantification taking place at a given time or during a given time interval, and allowing the determination of a physiological state of the target cell.

A method for the identification and quantification of the expression of membrane receptors present on the surface of target cells using at least two soluble receptor binding ligands derived from the soluble part of the glycoprotein of an enveloped virus that interacts with a cellular cognate receptor, the receptor binding ligand containing a part or the totality of one of the receptor binding domains (RBD) of the glycoprotein, and the soluble receptor binding ligand being liable to interact with the at least one membrane receptor of a target cell, for the identification and quantification of the expression of membrane receptors present on the surface of target cells, the identification and quantification taking place at a given time or during a given time interval, and allowing the determination of a physiological state of the target cell.

The present invention provides a sensitive and specific indirect homogeneous mobility shift assay using size exclusion chromatography to measure biologics such as vedolizumab and ustekinumab in a patient sample. The assays of the present invention are particularly advantageous for detecting the presence or level of biologics that target complex or large antigens including cell surface proteins, transmembrane proteins, heavily glycosylated proteins, and multimeric proteins, as well as antigens that cannot be purified, impure antigens, and partially or substantially purified antigens. The present invention also provides isolated soluble α4β7 integrin heterodimers and isolated soluble IL-12p40 monomers that are suitable for use in the indirect assays described herein.

Rapid, point of care semi-quantitative tests for viral or bacterial antibody titer, and methods and kits for carrying out the same. The test article comprises a first elongated solid support with a sample application region and a detection region. The detection region comprises immobilized antigen that specifically binds a minimum immunoprotective level of antibody to at least one pathogen of interest. Depending upon the test results, the assay can rapidly indicate whether the animal has the presumptive minimally-protective level of antibody to the target pathogen, or needs to be re-vaccinated.

An imaging flow cytometry apparatus and method which allows registering multiple locations across a cell, and/or across multiple flow channels, in parallel using radio-frequency-tagged emission (FIRE) coupled with a parallel optical detection scheme toward increasing analysis throughput. An optical source is modulated by multiple RF frequencies to produce an optical interrogation beam having a spatially distributed beat frequency. This beam is directed to one or more focused streams of cells whose responsive fluorescence, in different frequencies, is registered in parallel by an optical detector.

The present invention concerns an in vitro method for measurement of 25-hydroxyvitamin D, wherein the potentially interfering compound 24,25-dihydroxyvitamin D.sub.3 is blocked by a binding agent specifically binding to 24,25-dihydroxyvitamin D.sub.3 and not binding to 25-hydroxyvitamin D.

The present invention concerns an in vitro method for measurement of 25-hydroxyvitamin D, wherein the potentially interfering compound 24,25-dihydroxyvitamin D.sub.3 is blocked by a binding agent specifically binding to 24,25-dihydroxyvitamin D.sub.3 and not binding to 25-hydroxyvitamin D.

Disclosed are methods and systems for analyte detection in a sample and more particularly, a biological sample. Methods and systems particularly relate to differentiating and/or identifying cell types in biological samples, such as blood samples, by adding antibodies specific to predetermined CD antigens. Other methods and systems relate to controlling the dynamic range of an assay for analyte detection.

Disclosed are methods and systems for analyte detection in a sample and more particularly, a biological sample. Methods and systems particularly relate to differentiating and/or identifying cell types in biological samples, such as blood samples, by adding antibodies specific to predetermined CD antigens. Other methods and systems relate to controlling the dynamic range of an assay for analyte detection.