BCPoCUS - BC Point of Care Ultrasound

BC Point of Care Ultrasound

Your go-to resource for point-of-care ultrasound rapid summaries and videos.

Amniotic Fluid

Rapid Summary

When to Scan:

Pregnant patients (2nd or 3rd trimester – after 24 weeks):

  • Vaginal bleed
  • Trauma
  • Decreased fetal movement
  • Non reassuring NST
  • Post dates evaluation

Transabdominal Approach:

  • Don't forget to change exam setting to OB
5 Minute Video

Where to put the probe:

AF probe position

• Set depth to maximum
• Divide uterus into 4 quadrants
• Start superior to umbilicus in longitudinal
• Slide laterally on abdomen to visualize entire quadrant
• Move caudad in search and rescue grid fashion looking for deepest vertical fluid pocket
• Repeat scan in remaining uterine quadrants

When to scan:

When to Scan:

Pregnant patients (2nd or 3rd trimester – after 24 weeks):

  • Vaginal bleed
  • Trauma
  • Decreased fetal movement
  • Non reassuring NST
  • Post dates evaluation

Transabdominal Approach:

  • Don't forget to change exam setting to OB

Where you put the probe:

AF probe position
  • Set depth to maximum
  • Divide uterus into 4 quadrants
  • Start superior to umbilicus in longitudinal
  • Slide laterally on abdomen to visualize entire quadrant
  • Move caudad in search and rescue grid fashion looking for deepest vertical fluid pocket
  • Repeat scan in remaining uterine quadrants

Findings

AF-1

• Freeze image at deepest vertical pocket

AF-2

• Measure vertically with calipers

AF-3

• Choose deepest pocket of the four quadrants

AF-2

• >3cm normal

Note: If doing Amniotic Fluid Index – add deepest pockets in all four quadrants. >5 is normal.