MARK THOMAS / SCIENCE PHOTO LIBRARY MARK THOMAS / SCIENCE PHOTO LIBRARY
Home pregnancy test. Packet containing two 'Clear Blue' pregnancy tests. The tests work by detecting the hormone human chorionic gonadotropin (hCG) that is present in the urine of a pregnant woman. A dipper with an absorbent end is placed in the urine stream, or dipped in a urine sample. Blue lines display the results after one minute. A round window gives a reference line that shows that the test has worked. A line in a square window confirms the presence or absence of hCG. HCG is produced by the placenta, the organ that attaches an embryo to the wall of the uterus.
Model release not required. Property release not required.