Dual isotope assays
First Claim
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1. A method of testing for thyroid function by performing a radio-immunoassay of a sample by a dual isotope technique comprising the steps:
- (a) mixing the sample to be assayed with a version of a first thyroid component selected from the group T3, T4, TSH and TGB labelled with Se-75 and a version of a second thyroid component selected from the said group labelled with another radioactive isotope, and with an antibody to the said first component and an antibody to the said second component, the amount of antibody being in each case insufficient for reaction with all the thyroid component and labelled version thereof that are present,(b) incubating the mixture to effect reaction between the thyroid components and the labelled versions thereof, and their respective antibodies,(c) separating the fractions of the thyroid components plus the labelled versions thereof that are bound to the antibodies from the fractions not so bound,(d) measuring the radioactive concentrations of the bound or the unbound fractions, and(e) using the measurements to calculate the concentrations of the thyroid components in the sample being assayed.
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Abstract
Dual isotope assays for thyroid function are performed by carrying out a radio-immunoassay for two of thyroxine (T4), tri-iodothyronine (T3), thyroid stimulating hormone (TSH), and thyroxine binding globulin (TBG) wherein a version of one of the thyroid components, preferably T4 or T3 is labelled with Selenium-75 and the version of the other thyroid component is labelled with a different radionuclide, preferably Iodine-125.
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Citations
9 Claims
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1. A method of testing for thyroid function by performing a radio-immunoassay of a sample by a dual isotope technique comprising the steps:
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(a) mixing the sample to be assayed with a version of a first thyroid component selected from the group T3, T4, TSH and TGB labelled with Se-75 and a version of a second thyroid component selected from the said group labelled with another radioactive isotope, and with an antibody to the said first component and an antibody to the said second component, the amount of antibody being in each case insufficient for reaction with all the thyroid component and labelled version thereof that are present, (b) incubating the mixture to effect reaction between the thyroid components and the labelled versions thereof, and their respective antibodies, (c) separating the fractions of the thyroid components plus the labelled versions thereof that are bound to the antibodies from the fractions not so bound, (d) measuring the radioactive concentrations of the bound or the unbound fractions, and (e) using the measurements to calculate the concentrations of the thyroid components in the sample being assayed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification