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The timing of a positive pregnancy test may also be helpful in this regard to assess the possible dates of conception.
A positive pregnancy test 3 weeks previously for example, would indicate a gestational age of at least 7 weeks.
Ultrasound can also very importantly confirm the site of the pregnancy is within the cavity of the uterus. A visible heartbeat could be seen and detectable by pulsed doppler ultrasound by about 6 weeks and is usually clearly depictable by 7 weeks.
Any violation of this copyright, such as copying or reproducing any of these pages is an illegal act and will be prosecuted to the fullest extent of the law.For example, if ultrasound scan demonstrates a 7mm embryo but cannot demonstrable a clearcut heartbeat, a missed abortion may be diagnosed.In such cases, it is reasonable to repeat the ultrasound scan in 7-10 days to avoid any error.Ultrasound scan is currently considered to be a safe, non-invasive, accurate and cost-effective investigation in the fetus. The gestational sac can be visualized as early as four and a half weeks of gestation and the yolk sac at about five weeks.It has progressively become an indispensible obstetric tool and plays an important role in the care of every pregnant woman. The embryo can be observed and measured by about five and a half weeks. The viability of the fetus can be documented in the presence of vaginal bleeding in early pregnancy.