How the test is performed A urine sample is obtained. Urinate in the normal manner, but collect a sample in a container.
Most pregnancy tests depend on the process of agglutination.
Some of the more sensitive urine tests use monoclonal antibodies rather than sensitized red blood cells. Some home pregnancy tests simply require the test strip to be dipped into the urine or passed through the urine stream while urinating. No special preparation is needed. The first morning urine sample is often recommended. When the test is negative but pregnancy is still suspected, the test should be repeated in 1 week.