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Comprehensive Obstetric Ultrasound Guide

Understand the key aspects of obstetric ultrasounds, from gestational sac to fetal development and multiple pregnancy detection. Learn about necessary questions to ask before scanning and the significance of different measurements.

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Comprehensive Obstetric Ultrasound Guide

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  1. Obstetric Ultrasound By .Lamyaaalluhaydan

  2. 1- Is usually obtained twice during the normal pregnancy: (18-24 weeks) , (32-38 weeks). 2- It can be done before 18 weeks: • -to confirm intra-uterine pregnancy . • -estimation of G.A. • -exclude abnormal pregnancy (molar or ectopic ). • -multiple pregnancy .

  3. QUSTION ALWAYS SHOULD BE ASKED TO THE PREGNANCY WOMEN BEFROE SCANNING: - LMP. - any cardiac problems. - any previous abnormal baby . - bleeding? - any abnormal pain ? - medication ?? - diabetic ?? SCANNING : -Transvaginal : for early pregnancy on the first 9 wk -Transabdomenal .

  4. GESTATIONAL SAC : -its usually visualized from 31 days (4+3 wks) =(2-3 mm)or (5+3 wks). -it will appear as circle area surrounding by thick bright ring at fundal area. -it grow approx. (1mm/day) -at (8 weeks) amniotic cavity expands rapidly . -at the end of the first trimester, the amniotic and chorionic membrane becomes fused .

  5. YOLK SAC: -appear as circle mass with the G.S. -it can be identified at (35 days). -it grow slowly until reach a maximum of (6 mm)at (10 wks). -the identification of the yolk sac will be very difficult after (12 wks).

  6. EMBRYO: -(4-9) wks (embryo). -(10-40) wks (fetus ). -it can be visualized from (5 wks) ,on this stage CROWN-RUMP-LENGTH (CRL) can be measured. -the embryo grow (1 mm/day ) -cardiac activity (heart rate ) seen (6-9 wks ) -about ( 9 wks ) placenta can be seen -at ( 8 wks ) upper + lower lumb can be seen more clearly .

  7. NUCHAL TRANSLUCENCY (NT): Seen between ( 11-14 ) weeks.

  8. MULTIPLE PREGANCY:

  9. ECTOPIC PREGNANCY

  10. Molar pregnancy :

  11. Second trimester -it called ( routine anomaly scan ) (18-24 wks ). -optimal time to examine fetal heart at (23-24 wks). -fetal anatomy ,placenta ,amount of amniotic volume ,fetal movement ,measurements ,ovary ,uterus , both adnexa .

  12. 1- Biparital diameter (BPD) 2- Head circumference (HC)

  13. 3- Abdominal circumference (AC)

  14. 4- Femoral length(FL)

  15. 5- FETAL POSITION:(cephalic-breach) 6- PLACENA SITE

  16. Thank you

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