Scan technique ii

Indications for 2nd & 3rd trimester scanning

• Assigning dates
• Assessing foetal growth, amniotic fluid volume, foetal heart motion & foetal presentation.
• Assessing placental position & texture.
• For review of foetal anatomy
• To detect the presence of adenexal masses or cysts or uterine myomas

Scan technique

• Bi parietal diameter measurement of the foetal head –BPD
• BPD measurement is more accurate in the first trimester.
• BPD is the distance between the anterior & posterior tables of the skull.
• It is measured perpendicular to the mid line echo (falx)

 

Scan technique i

First trimester

Indications

• Bleeding after a POA
• Pain during pregnancy
• Pregnancy complicated by fibroid or ovarian cyst

 

Preparation
Scans are performed though the full bladder using a 5 MHtz curvilinear probe.

Indications for first trimester sonography 

• Localization of the GS –Intra uterine or Ectopic pregnancy
• Identification of foetal viability
• Anovular gestation
• Estimation of POG
• Assessment of multiple pregnancy, number of embryos chorionicity & amniocity