Scan dating becomes progressively less accurate and should be utilized only up to 20 weeks' GA:

■ US measures the size of the fetus, not the gestational age.

■ Biologic variation in size increases as gestation advances.

If FHTs are not auscultated by 11 weeks' GA, an ultrasonic evaluation should be performed to document a viable intrauterine pregnancy.

Scan dating is useful up to 20 weeks' GA when menstrual data is unreliable or conflicts with clinical findings.


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