Acog ultrasound dating criteria

Methods for Estimating the Due Date

Some women may have an ultrasound exam in the first trimester of pregnancy. An ultrasound exam done this early is used to do the following:.

Ultrasound is used to create images of the pelvic organs to find or diagnose problems. Some of the ways in which ultrasound may be used include the following:.

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In addition, ultrasound may be used to assess mammography findings that are unclear, help guide breast biopsy procedures, and evaluate breast lumps. During a pelvic ultrasound exam, the transducer is either moved across your abdomen transabdominal ultrasound or placed in your vagina transvaginal ultrasound. The type of ultrasound exam you have depends on what types of images your ob-gyn or other health care professional needs and why the exam is being done.

You will lie on a table with your abdomen exposed from the lower part of the ribs to the hips.

Acog ultrasound dating criteria

A gel is applied to the surface of the abdomen. This improves contact of the transducer with the skin surface.

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The handheld transducer then is moved along the abdomen to make images. You may need to drink several glasses of water during the 2 hours before your exam. This will make your bladder full. You will be asked to change into a hospital gown or undress from the waist down.

Ultrasound Exams - ACOG

It is recommended that you empty your bladder before the test. You will lie on your back with your feet in stirrups, like for a pelvic exam. The transducer for this exam is shaped like a wand.


It is covered with a latex sheath, like a condom, and lubricated before it is inserted into the vagina. Currently, there is no evidence that ultrasound is harmful to a developing fetus.

Women's Health Care Physicians

No links have been found between ultrasound and birth defects, childhood cancer, or developmental problems later in life. The EDD Calculator also recalculates the due date based on ultrasound or on assisted reproductive technology ART to assist health care providers with patients who undergo embryo transfer, or IVF, in adherence to the Committee Opinion. ACOG supports the use of the EDD Calculator and will transition away from the physical plastic wheel in favor of this modern reinvention. That's the highest score among all of the other pregnancy wheel apps that my colleagues and I previously evaluated in our study published in Obstetrics and Gynecology in June Many women have irregular cycles, or falsely recall the date of LMP or have irregular ovulation, which is not considered when calculating the EDD by traditional method.

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  • The American College of Obstetricians and Gynecologists, the American Institute of Ultrasound in Medicine, and the Society for Maternal—Fetal Medicine make the following recommendations regarding the method for estimating gestational age and due date: If the pregnancy is the result of successful ART procedure, then the EDD is calculated based on age of embryo and day of transfer. As soon as LMP and results of first trimester ultrasound are known, EDD should be calculated and recorded in medical records.