Ultrasound examination in the first trimester allows accurate assessment of gestational age, and identifies and allows for appropriate care of women with multiple pregnancies. Back to Your pregnancy and baby guide. There are no international standards for relating fetal crown—rump length CRL to gestational age GAand most existing charts have considerable methodological limitations. Obstetric ultrasonography is the use of medical ultrasonography in pregnancyin which sound waves are used to create real-time visual images of the developing embryo or fetus in its mother's uterus womb. Pettker, MD; James D.
Right now there is a lone egg and a whole bunch of anxious sperm eager to fertilize the egg. Crown rump length CRL is the length of the embryo or fetus from the top of its head to bottom of torso. Every pregnant woman wants to know her due dateand a due date that is calculated from her last menstrual period with a due date calculator often doesn't match the due date that is estimated by her first ultrasound also known as a sonogram. Pregnancy lasts an average of days 40 weeks from the first day of your last menstrual period LMP. NCBI Bookshelf.
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