The Viola pregnancy test with week determination can be used from the time of missed period (detection limit 25 mIU hCG/ml). The concentration of the hormone hCG steadily increases after fertilization, allowing for the estimation of the week of pregnancy. Due to particularly careful calibration, the intensity of the test line in the Viola pregnancy test with week determination can be correlated with an hCG value that is typical for a specific time after fertilization. If the test shows a positive result after five minutes, the test line can be compared with the scale included in the instructions to read the week of pregnancy.