Obstetrics Book

http://www.fpnotebook.com/

Trisomy Findings on Fetal Ultrasound

Aka: Trisomy Findings on Fetal Ultrasound
  1. Indications: Non-invasively assess trisomy risk
    1. Maternal age over 35 years
  2. General
    1. Trisomy risk Age >35 years
      1. Overall: 1 in 80
      2. With Negative Ultrasound: 1 in 400
    2. Ultrasound detects
      1. Trisomy 18: 100%
      2. Trisomy 21: 66%
  3. Screening: Rating system to assess for Trisomy
    1. Scoring
      1. Nuchal Fold (5mm)
        1. Assess at level of Cerebellum and cisterna magna
        2. Not predictive after 21 weeks
        3. 2 Points
      2. Short femur length
        1. 1 Point
      3. Cystic Hygroma
        1. Seen in Turners Syndrome, Trisomy 21, Idiopathic
        2. 1 Point
      4. Septal defect or other heart defect
        1. 1 Point
      5. Choroid plexus cyst
        1. 1 Point
    2. Interpretation: Score associated with Trisomy risk
      1. Age <35: Score >= 2 points
      2. Age >35: Score >= 1 point
  4. Evaluation: Findings suggestive of Trisomy
    1. Amniocentesis with karyotype

You are currently viewing the original 'fpnotebook.com\legacy' version of this website. Internet Explorer 8.0 and older will automatically be redirected to this legacy version.

If you are using a modern web browser, you may instead navigate to the newer desktop version of fpnotebook. Another, mobile version is also available which should function on both newer and older web browsers.

Please Contact Me as you run across problems with any of these versions on the website.

Navigation Tree