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Related Experiment Videos

Fetal ear length.

J C Birnholz1, E E Farrell

  • 1Department of Diagnostic Radiology Rush-Presbyterian-St Luke's Medical Center, Chicago, IL 60612.

Pediatrics
|April 1, 1988
PubMed
Summary
This summary is machine-generated.

Prenatal ear length standards were established using ultrasound. Significantly short ears in fetuses may indicate chromosomal disorders, aiding early diagnosis.

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Area of Science:

  • Prenatal diagnosis
  • Medical imaging
  • Genetics

Background:

  • Establishing normative fetal growth standards is crucial for identifying developmental abnormalities.
  • Ear length is a potential biometric marker for fetal development.

Purpose of the Study:

  • To develop a prenatal standard for fetal ear length using ultrasound.
  • To investigate the association between abnormal fetal ear length and chromosomal disorders.

Main Methods:

  • Utilized ultrasonic images from 180 normal pregnancies.
  • Applied linear regression to establish a growth curve for ear length based on gestational age.
  • Defined short ears as measurements >= 1.5 standard deviations below the mean for gestational age.

Main Results:

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  • Fetal ear length demonstrated a consistent increase from approximately 6 mm at 15 weeks to 33 mm at term.
  • The growth pattern was accurately modeled by linear regression (r2 = .96).
  • A strong and specific association was found between short fetal ears and chromosomal disorders.

Conclusions:

  • The developed prenatal ear length standard provides a reliable tool for assessing fetal ear development.
  • Significantly short fetal ears are a potential indicator for chromosomal abnormalities, warranting further investigation.
  • This biometric parameter may contribute to earlier detection of genetic conditions during prenatal screening.