Third TrimesterThis is a featured page

Ultrasound scanning guidelines


Third Trimester


Assess:
  • Fetal number
  • Fetal cardiac activity
  • Fetal anatomy
  • Growth parameters
  • Fetal lie
  • Placental localisation
  • Liquor
  • Cervix
  • Maternal pelvic / adnexal massess
Documentation:
  • Transverse placenta
  • Midline of internal os showing placental relationship
  • Amniotic Fluid Index (AFI)
  • Transverse chest documenting fetal heart movement with M-mode
  • Documentation of fetal lie showing head/neck position
  • Measurements including
    • BPD / HC
    • AC
    • Femur length
  • Trans kidneys (coronal view + renal length if dilatation present)
  • Trans bladder
  • Coronal diaphragm
Twins

Renal Dilatation

If renal dilatation present

The definition of renal dilatation changes at 32 weeks to:
  • Mild >7mm but <10mm
  • Moderate / marked >10mm

Placenta Previa

Defined in the 3rd trimester as a placenta less than 5 cm from the internal os

  • Measure and document the distance between the lower margin of the placenta and the internal os
  • Assess lower uterine segment with colour Doppler for evidence of vessels crossing the internal os
  • Determine the site of placental cord insertion
  • Documentation of internal os in long midline / trans +/- clipstore with colour Doppler


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AndyC
AndyC 		Latest page update: made by AndyC , Feb 25 2009, 6:54 AM EST (about this update About This Update AndyC Edited by AndyC

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Keyword tags: 3rd protocol third trimester ultrasound
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