Thyroglobulin quantitation by mass spectrometry
AssigneeQuest Diagnostics Investments Incorporated
InventorsYanni Zhang, Nigel J. Clarke, Richard E. Reitz
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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.
Claims20
A method for determining the amount of thyroglobulin in a test sample, comprising:
- (a) digesting thyroglobulin from the test sample to form peptide T129;
- (b) ionizing the peptide T129 to generate a multiply charged ion detectable by mass spectrometry;
- wherein the ion has a mass/charge ratio (m/z) of 636.4±0.5;
- and
- (c) detecting the amount of one or more T129 fragment ions each having a m/z selected from the group consisting of 541.3±0.5, 612.3±0.5, 636.4±0.5, 726.4±0.5, 797.4±0.5, 912.4±0.5, and 1059.5±0.5 by mass spectrometry;
- wherein the amount of the ions detected is related to the amount of the thyroglobulin in the test sample.
A method for determining persistence of thyroid tissue in a patient after surgical removal of the thyroid gland, the method comprising:
- (a) digesting thyroglobulin in a body fluid or tissue sample obtained from the patient to form peptide T129;
- (b) ionizing the peptide T129 to generate a multiply charged ion detectable by mass spectrometry;
- wherein the ion has a mass/charge ratio (m/z) of 636.4±0.5;
- (c) detecting the amount of one or more T129 fragment ions each having a m/z selected from the group consisting of 541.3±0.5, 612.3±0.5, 636.4±0.5, 726.4±0.5, 797.4±0.5, 912.4±0.5, and 1059.5±0.5 by mass spectrometry, wherein the presence of the one or more T129 fragment ions indicates persistence of thyroid tissue in the patient.
Dependencies are inferred from the claim text.