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READ THIS IF YOU DON'T UNDERSTAND WHY HER DOCTOR WON'T DO AN ULTRASOUND!!!
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The answer is, it's not necessary. While a social expectation, routine ultrasounds *do not* improve outcomes for mothers or babies, and actually can lead to incorrect diagnoses, unwarrented stress, and other unecessary testing because of false positive results. There have also been no long term studies done to determine if ultrasounds are totally safe (remember how they used to x-ray pregnant women?). Here are the guidelines for whether a woman qualifies for an u/s according to the American Institute of Ultrasound in Medicine.
"Simply stated, if a pregnant woman is young (but not too young) and healthy; has a firm recollection of the dates of her last normal menstrual period; goes for examination by her obstetrician early in pregnancy; has completely unremarkable physical examination findings and medical, family, and obstetric histories; meets every milestone during her pregnancy; and has no unusual laboratory findings, then she is not a candidate for sonography."
"ACOG (The American College of Obstetrics and Gynecologists) and the AIUM have published guidelines for obstetric sonography. Neither of these organizations supports the use of routine sonographic screening of all pregnant women."
I'd say that T. has an excellent doctor who is following the guidelines of evidence based medicine.