First Trimester Scans
Weeks 7, 8, 9 and 10
|The first trimester is months one, two, and three of your pregnancy.|
Below are scan pictures taken during the early weeks of pregnancy. It is recommended that all pregnant women have a scan in the first trimester, to date the pregnancy and to see any problems there may be 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 your 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.
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.
Scans for week:
7 Weeks Scans
|The presence of a heartbeat is seen as a very positive sign. Details of the heart anatomy are not visible, but the atrial and ventricular compartments can sometimes be distinguished by the reciprocal [alternating] movements of the walls. The heart rate increases from 130 bpm to 160 bpm.|
Gestational age (GA) in the first trimester is usually calculated from the fetal crown-rump length (CRL). This is the longest demonstrable length of the embryo or fetus, excluding the limbs and the yolk sac.
The correlation between CRL and GA is excellent until approximately 12 weeks. No sex or race differences are appreciable, but maternal characteristics, such as age and smoking, may have a significant effect beyond 10 week gestation. The GA estimate has a 95% confidence interval of plus or minus 6 days, and it is most accurate between 7 and 10 weeks of pregnancy.
Transabdominal ultrasonography may underestimate gestational age by an average of 1.6 days compared with transvaginal ultrasonography.
Week 7 Fetal Development
8 Weeks Scan
CRL (crown to rump length) = 16mm to 20mm
Length = 0.6 to 0.9 inch
Weight = 1g or 0.04oz
Eight week 3D scan
During week 9, the heart rate reaches a maximum of about 175 bpm. CRL (crown to rump length) = 20mm to 30mm. Length = 0.9 to 1.2 inch.
9 Weeks Scans
Weight = 2g or 0.07oz
3D Scan Week 9
Week 10 Scan
More Ultrasound Scan Information:
Charts and tables for: - CRL - BPD - OFD - HC - HL - FL scan measurements.
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