There is provided a novel composition for the direct determination of the existence of pregnancy by the admixture therewith of a sample of urine, plasma, or serum from the female believed to be pregnant. This novel composition is prepared by mixing serum obtained from rabbits previously injected with human chorionic gonadotrophin (HCG), with polystyrene latex particles and heating for a short time.
A method for determining the amount of IgG present in a neonatal foal or calf or in the colostrum of a dam or cow. The method involves contacting a body fluid sample with biologically inert latex particles, measuring the amount of agglutination which occurs, and determining the amount of IgG present. The latex particles are diluted to a final concentration of from about 0.25 to 2.0 percent (w/v) at a pH of from about 7.5 to 9.0 with a buffer. The body fluid is diluted to a range of from 0.01:5 parts to 0.01:2160 parts, v/v basis, at a pH of from about 7.5 to 9.0.
A highly sensitive direct particle agglutination test capable of routinely detecting as little as 0.2 nanograms of antigen per milliliter of clinical fluid and characterized by uniform sensitivity as well as stability is disclosed as well as coated particles having a sensitivity of 0.2 nanograms antigen per milliliter and methods for preparing such coated particles. In addition, a method to reduce the frequency of non-specific agglutination with human sera to 2% or less is described.
A simple, sensitive method and device for detecting pregnancy. The test involves concentration by ultrafiltration of a sample of urine or serum from a subject; followed by determining the presence of human chorionic gonadotropin or of its .beta.-subunit in the concentrated sample.
4123224 - Diagnostic test device - Owned by American Home Products Corporation (New York, NY) [*] Notice:The portion of the term of this patent subsequent to July 5, 1994 has been disclaimed.
A simple, sensitive method and device for detecting pregnancy. The test involves concentration by ultrafiltration of a sample of urine or serum from a subject; followed by determining the presence of human chorionic gonadotropin or of its .beta.-subunit in the concentrated sample.
An immunoassay wherein the sample containing an immunologic substance is added to a suspension of particles coated with a second immunologic substance which is specific to the immunologic substance of the sample. The change in percentage of light transmission through the suspension undergoing the resulting agglutination is measured for a predetermined period of time and compared to a standard graph. The suspension is under constant agitation during the measurement.
