In chronic Chagas disease, the concentration of parasites in the blood is too low to be reliably detected by microscopy or PCR, so the diagnosis is usually made using serological tests, which detect immunoglobulin G antibodies against in the blood. Two positive serology results, using different test methods, are required to confirm the diagnosis. If the test results are inconclusive, additional testing methods such as Western blot can be used.
In chronic Chagas disease, the concentration of parasites in the blood is too low to be reliably detected by microscopy or PCR, so the diagnosis is usually made using serological tests w.hich detect immunoglobulin G antibodies against in the blood Two positive serology results, using different test methods, are required to confirm the diagnosis. If the test results are inconclusive, additiona,l testing methods such as Western blot can be used.