1 Add 10 drops of Benedicts solution to each test tube. 2  Place the test tubes in the hot-water bath. Heat the test tubes for 3 to 5 minutes, or until the indicator changes color, if it changes color.  With a test tube holder, remove the tubes from the hot-water bath and place them back in the test tube rack.
Prostate Ultrasound. Prostate Ultrasound. Definition. A prostate ultrasound is a diagnostic test used to detect potential problems with a man's prostate. An ultrasound test uses very high frequency sound waves that are passed through the body. The pattern of reflected sound waves, or echoes, shows the outline of the prostate.
An ultrasound can detect a pregnancy as early as 4 to 5 weeks after your last menstrual period. A transvaginal ultrasound will give a clearer view than an abdominal ultrasound at this early date. The earliest sign of a pregnancy is a tiny sac in the uterus, which may be seen as early as 4 weeks after your last period.