Abstract: Provided are methods for determining the amount of thyroglobulin in a sample using various purification steps followed by mass spectrometry. The methods generally involve purifying thyroglobulin in a test sample, digesting thyroglobulin to form peptide T129, purifying peptide T129, ionizing peptide T129, detecting the amount of peptide T129 ion generated, and relating the amount of peptide T129 ion to the amount of thyroglobulin originally present in the sample.

Abstract: Methods are described for measuring the amount of a methylation TPMT enzyme product in a sample. More specifically, mass spectrometric methods are described for detecting and quantifying 6-MMP or isotopically labeled 6-MMP in a test sample utilizing mass spectrometric techniques and for using such methods to determine the activity of TPMT enzyme that is present in a sample.

Abstract: Methods are described for measuring the amount of a methylation TPMT enzyme product in a sample. More specifically, mass spectrometric methods are described for detecting and quantifying 6-MMP or isotopically labeled 6-MMP in a test sample utilizing mass spectrometric techniques and for using such methods to determine the activity of TPMT enzyme that is present in a sample.

Abstract: Provided are methods for determining the amount of thyroglobulin in a sample using various purification steps followed by mass spectrometry. The methods generally involve purifying thyroglobulin in a test sample, digesting thyroglobulin to form peptide T129, purifying peptide T129, ionizing peptide T129, detecting the amount of peptide T129 ion generated, and relating the amount of peptide T129 ion to the amount of thyroglobulin originally present in the sample.

Abstract: Provided are methods of detecting the presence or amount of a dihydroxyvitamin D metabolite in a sample using mass spectrometry. The methods generally comprise ionizing a dihydroxyvitamin D metabolite in a sample and detecting the amount of the ion to determine the presence or amount of the vitamin D metabolite in the sample. In certain preferred embodiments the methods include immunopurifying the dihydroxyvitamin D metabolites prior to mass spectrometry. Also provided are methods to detect the presence or amount of two or more dihydroxyvitamin D metabolites in a single assay.

Abstract: Provided are methods of detecting the presence or amount of a dihydroxyvitamin in D metabolite in a sample using mass spectrometry. The methods generally comprise ionizing a dihydroxyvitamin D metabolite in a sample and detecting the amount of the ion to determine the presence or amount of the vitamin D metabolite in the sample. In certain preferred embodiments the methods include immunopurifying the dihydroxyvitamin D metabolites prior to mass spectrometry. Also provided are methods to detect the presence or amount of two or more dihydroxyvitamin D metabolites in a single assay.

Abstract: Provided are methods for determining the amount of underivatized dehydroepiandrosterone (DHEA) in a sample using mass spectrometry. The methods generally involve ionizing DHEA in a sample and detecting and quantifying the amount of the ion to determine the amount of DHEA in the sample.

Abstract: Provided are methods for determining the amount of underivatized dehydroepiandrosterone (DHEA) in a sample using mass spectrometry. The methods generally involve ionizing DHEA in a sample and detecting and quantifying the amount of the ion to determine the amount of DHEA in the sample.

Abstract: Provided are methods for determining the amount of dihydrotestosterone (DHT) in a sample using mass spectrometry. The methods generally involve ionizing DHT in a sample and detecting and quantifying the amount of the ion to determine the amount of DHT in the sample.

Abstract: Provided are methods for measuring renin activity in a plasma sample using mass spectrometry. The methods generally involve ionizing purified angiotensin 1 from the sample and detecting the amount of angiotensin 1 ions generated. The amount of detected angiotensin 1 ions are then related to the amount of angiotensin 1 generated in the sample, which in turn is related to renin activity in the sample.

Abstract: Provided are methods for determining the amount of dihydrotestosterone (DHT) in a sample using mass spectrometry. The methods generally involve ionizing DHT in a sample and detecting and quantifying the amount of the ion to determine the amount of DHT in the sample.

Abstract: Provided are methods for measuring renin activity in a plasma sample using mass spectrometry. The methods generally involve ionizing purified angiotensin 1 from the sample and detecting the amount of angiotensin 1 ions generated. The amount of detected angiotensin 1 ions are then related to the amount of angiotensin 1 generated in the sample, which in turn is related to renin activity in the sample.

Abstract: Methods are provided for detecting the amount of one or more CAH panel analytes (i.e., pregnenolone, 17-OH pregnenolone, progesterone, 17-OH progesterone, dehydroepiandrosterone (DHEA), androstenedione, testosterone, deoxycorticosterone, 11-deoxycortisol, and cortisol) in a sample by mass spectrometry. The methods generally involve ionizing one or more CAH panel analytes in a sample and quantifying the generated ions to determine the amount of one or more CAH panel analytes in the sample. In methods where amounts of multiple CAH panel analytes are detected, the amounts of multiple analytes are detected in the same sample injection.

Abstract: Methods are provided for detecting the amount of one or more HRT panel analytes (i.e., estrone (E1), estrone sulfate (E1s), 17?-estradiol (E2a), 17?-estradiol (E2b), estradiol sulfate (E2s), estriol (E3), equilin (EQ), 17?-dihydroequilin (EQa), 17?-dihydroequilin (EQb), Equilenin (EN), 17?-dihydroequilenin (ENa), 17?-dihydroequilenin (ENb), and ?8,9-dehydroestrone (dE1)) in a sample by mass spectrometry. The methods generally involve ionizing one or more HRT panel analytes in a sample and quantifying the generated ions to determine the amount of one or more HRT panel analytes in the sample. In methods where amounts of multiple HRT panel analytes are detected, the amounts of multiple analytes are detected in the same sample injection.

Abstract: Methods are described for measuring the amount of a methylation TPMT enzyme product in a sample. More specifically, mass spectrometric methods are described for detecting and quantifying 6-MMP or isotopically labeled 6-MMP in a test sample utilizing mass spectrometric techniques and for using such methods to determine the activity of TPMT enzyme that is present in a sample.

Abstract: Provided are methods for determining the amount of dihydrotestosterone (DHT) in a sample using mass spectrometry. The methods generally involve ionizing DHT in a sample and detecting and quantifying the amount of the ion to determine the amount of DHT in the sample.

Abstract: Provided are methods for determining the amount of underivatized dehydroepiandrosterone (DHEA) in a sample using mass spectrometry. The methods generally involve ionizing DHEA in a sample and detecting and quantifying the amount of the ion to determine the amount of DHEA in the sample.

Abstract: Provided are methods for measuring renin activity in a plasma sample using mass spectrometry. The methods generally involve ionizing purified angiotensin 1 from the sample and detecting the amount of angiotensin 1 ions generated. The amount of detected angiotensin 1 ions are then related to the amount of angiotensin 1 generated in the sample, which in turn is related to renin activity in the sample.

Abstract: Provided are methods for determining the amount of estrone in a sample using mass spectrometry. The methods generally involve ionizing estrone in a sample and detecting and quantifying the amount of the ion to determine the amount of estrone in the sample.

Abstract: Provided are methods for determining the amount of thyroglobulin in a sample using various purification steps followed by mass spectrometry. The methods generally involve purifying thyroglobulin in a test sample, digesting thyroglobulin to form peptide T129, purifying peptide T129, ionizing peptide T129, detecting the amount of peptide T129 ion generated, and relating the amount of peptide T129 ion to the amount of thyroglobulin originally present in the sample.