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First To Know detects the presence or absence of the pregnancy hormone (beta-hCG) in the blood. This pregnancy hormone is produced by the placenta as soon as the fertilized egg implants in the uterus. If a pregnancy has occurred, the pregnancy hormone level doubles every two or three days. The maximum level is reached at 8-10 weeks after the last menstrual period. To perform First To Know® you need just a drop of blood, obtained from the puncture of your f...ingertip with a small needle (included in the box). First To Know® can detect minimal quantities of the pregnancy hormone, present in the blood drop. The sensitivity and the ability to use blood are characteristics of First To Know, which allows a reliable result after only the 7th- 8th day post conception
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