Fetal middle cerebral arterial peak systolic velocity

Dr Owen Kang and Radswiki et al.

The fetal middle cerebral arterial (MCA) peak systolic velocity (PSV) is an important parameter in fetal MCA Doppler assessment.

Sonographic assessment

The fetal MCA should be sampled~2 mm from the origin of the fetal internal carotid artery and the angle of the ultrasound beam and the direction of blood flow should be 0°. Usually the highest value is taken.


  • reliable between 18-35 weeks
  • increased PSV can indicate moderate-to-severe anemia in non-hydrops fetuses 4

See also

  • automatic online fetal MCA PSV calculator as of 2011 from www.perinatology.com
Ultrasound - obstetric
Share article

Article information

rID: 15508
System: Obstetrics
Section: Approach
Tag: stub, cases
Synonyms or Alternate Spellings:
  • Fetal MCA peak systolic velocity (PSV)
  • Fetal middle cerebral arterial (MCA) peak systolic velocity (PSV)
  • Fetal MCA PSV

Support Radiopaedia and see fewer ads

Cases and figures

  • Drag
    3rd trimester normal MCA Doppler
    Drag here to reorder.
  • Updating… Please wait.

    Alert accept

    Error Unable to process the form. Check for errors and try again.

    Alert accept Thank you for updating your details.