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A standardized plane for biparietal diameter measurement.
Author(s) -
Shepard M,
Filly R A
Publication year - 1982
Publication title -
journal of ultrasound in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 91
eISSN - 1550-9613
pISSN - 0278-4297
DOI - 10.7863/jum.1982.1.4.145
Subject(s) - medicine , biparietal diameter , gestational age , reliability (semiconductor) , anatomy , nuclear medicine , pregnancy , power (physics) , genetics , physics , quantum mechanics , head circumference , biology
Biparietal diameter measurement is the most widely accepted means of determining gestational age. However, a standard anatomic plane for performing this measurement has not been established. Three hundred forty‐four measurements on 256 patients who gave birth to normal infants were obtained and compared at various cranial levels based on brain anatomy. The results document that use of a standardized plane increases measurement reliability but does not significantly alter variability. We postulate that variability is based predominantly on biologic variation in fetal growth rates rather than on technical errors.