A STD infection may become transmissible because of the delay that often occurs between getting infected and getting the test done. It usually takes about 48 hours to get the results of a STD test. Some tests like the one for syphilis takes about seven to 10 days. HIV test results can be obtained within three days.Chlamydia and gonorrhea test results take about a week.Tests done to check HIV infection can also provide information regarding the presence of some other STDs in the body. A urine and blood sample is usually taken during STD check-up. Symptoms like spots, wounds and sores are also looked into. STD infection may become transmissible because of the delay that often occurs between getting infected and getting the test done. It usually takes about 48 hours to get the results of a STD test. Some tests like the one for syphilis takes about seven to 10 days. HIV test results can be obtained within three days.