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Knowing the baby's age can help your health care provider determine your due date and track various milestones throughout your pregnancy.

The lowest amount of ultrasound energy that provides an accurate assessment should be used.

Fetal cardiac abnormalities: Screening, evaluation, and pregnancy management.

When scheduling your ultrasound, ask your health care provider for instructions.

This will improve the conduction of sound waves and eliminate air between your skin and the transducer.

Fetal imaging: Executive summary of a joint Eunice Kennedy Shriver National Institute of Child Health and Human Development, Society for Maternal-Fetal Medicine, American Institute of Ultrasound in Medicine, American College of Obstetricians and Gynecologists, American College of Radiology, Society for Pediatric Radiology, and Society of Radiologists in Ultrasound Fetal Imaging Workshop.

If you're bleeding or having other complications, an ultrasound might help your health care provider determine the cause.

Firstly, the saliva sample may have been compromised, either by the collection tube leaking in transit or by a failure of the preservative solution to mix with the saliva after collection.

Depending on your baby's position and stage of development, you might be able to make out a face, hands and fingers, or arms and legs.