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TPHA Analyzer
The TPPA (Treponema Pallidum Particle Agglutination Test) experimental analyzer is used to detect antibodies against Treponema pallidum in human serum or plasma4. It utilizes gelatin particles sensitized with Treponema pallidum antigens. When the patient's serum or plasma is mixed with these sensitized gelatin particles, if the serum or plasma contains antibodies against Treponema pallidum, the particles will aggregate to form visible clumps, indicating a positive result. If there is no clumping of gelatin particles, it is a negative result.
Characteristics and Advantages
• High specificity and sensitivity: It can accurately detect specific antibodies against Treponema pallidum, with a high specificity of 98% - 100% and a sensitivity of 85% - 100% in primary syphilis, and 98% - 100% in secondary and late - latent syphilis, which helps to reduce the occurrence of false - positive and false - negative results.
• Wide range of application: It is applicable to the detection of various stages of syphilis, including primary, secondary, and tertiary syphilis, and can improve the detection rate of syphilis in the first and third stages2.
• Stable results: The use of artificial gelatin particles instead of animal red blood cells makes the results more stable and easier to observe2.
Test Procedure
• Sample preparation: Usually, venous blood is collected from the patient, and the serum or plasma is separated for testing.
• Reagent preparation: The TPPA reagent includes sensitized gelatin particles and unsensitized gelatin particles, as well as other necessary reagents for dilution and reaction.
• Mixing and reaction: A certain amount of patient sample is mixed with the sensitized and unsensitized gelatin particles according to the specified ratio and incubated at a suitable temperature for a certain period of time to allow the antibodies in the sample to react with the gelatin particles.
• Result observation: After the reaction, the result is observed under a microscope or a specific analyzer. If there is obvious aggregation of gelatin particles, it is a positive result; if there is no aggregation, it is a negative result. The titer of antibodies can also be determined by observing the degree of aggregation.
Clinical Significance
A positive TPPA test result indicates that the patient may be infected with Treponema pallidum or has been infected in the past1. It is an important confirmatory test for syphilis infection4. However, a positive result needs to be comprehensively judged in combination with the patient's clinical symptoms, medical history, and other test results (such as RPR results)1.
