First Trimester Scans
|The first trimester is months one, two, and three of your pregnancy.|
Below are scan pictures taken during the early weeks of pregnancy. Measurements taken at these early scans will help to; confirm a pregnancy, date the pregnancy and to see any problems that may occur in the pregnancy ( low lying placenta, twins etc.).
Scans in early pregnancy are usually performed in the first trimester around 12 weeks. You may have a earlier scan, if you are experiencing pain or bleeding for example or unsure of LMP dates.
Transabdominal ultrasound will provide a panoramic view of the abdomen and pelvis and is noninvasive, whereas transvaginal ultrasound provides a more limited pelvic view and requires insertion of a probe into the vagina.
Transabdominal ultrasound cannot reliably diagnose pregnancies that are less than 6 weeks gestation. Transvaginal ultrasound, by contrast, can detect pregnancies earlier, at approximately 4 ½ to 5 weeks gestation. Prompt diagnosis made possible by transvaginal ultrasound can, therefore, result in earlier treatment.
It is recommended that all pregnant women have a scan in the first trimester, to establish the date when the baby is due, check the number of babies also the position of the placenta.
First trimester ultrasonic scans may show 'soft' markers for chromosomal abnormalities, such as the absence of fetal nasal bone or an increased fetal nuchal translucency (back of the neck) to enable detection of Down syndrome fetuses.
While your sonographer takes measurments they will explain what you are looking at. It may not be easy for you to make out what you are seeing on the screen in the early scans. The images below will give you an idea of what can be seen and what they look for at each week; of the first trimester.
More Ultrasound Scan Information:
Charts and tables for: - CRL - BPD - OFD - HC - HL - FL scan measurements.
Week 4 Scan
Week 5 Scans
An experienced sonographer can detect a yolk sac with transvaginal ultrasound when the gestational sac has reached a mean diameter of 8 mm to 10 mm. The presence of a yolk sac confirms the diagnosis of an intrauterine pregnancy and excludes ectopic pregnancy, except in rare cases of simultaneous intrauterine and extrauterine gestations.The yolk sac is first visible at 5 weeks and it is always present by 5 weeks and 4 days. There are lacunary structures [cavities or spaces] at the site of implantation. The embryonic pole appears adjacent to the yolk sac, soon showing cardiac activity. Since the connecting stalk is short, the embryonic pole is found near the wall.
With transvaginal ultrasonography, cardiac motion can sometimes be seen in a 2-mm to 3-mm embryo, and is invariably detected in normal pregnancy when the length of the embryo reaches 5 mm. At the end of week 5, the heart rate is about 60 – 90 bpm.
Week 6 Scan
The fetal pole grows at a rate of about 1 mm a day, starting at the 6th week of gestational age. Thus, a simple and accurate way to "date the fetus" in an early pregnancy is to add the length of the fetal pole (in mm) to 6 weeks. Using this method, a fetal pole measuring 5 mm would have a gestational age of 6 weeks and 5 days.
7 Weeks Scans
8 Weeks Scan
9 Weeks Scans
|During week 9, the heart rate reaches a maximum of about 175 bpm. |
Week 10 Scan
11 Weeks Scan
Week 12 Scans
13 Weeks Scan
The gender prediction test result is easy to read! The control test window will change color to either pink (Girl) or blue (Boy).Enjoy - First class