Dating 21 94
The practitioner must understand that these β-h CG levels are guidelines for the appearance of these structures and are not 100% reliable or accurate. Table 1 The appearance of early gestational structures LMP, last menstrual period; FHTs, positive fetal heart tones(Warren WB, Timor-Trisch I, Peisner DB et al: Dating the early pregnancy by sequential appearance of embryonic structures.
The β-h CG cut-offs for visualizing a intrauterine pregnancy sac, a yolk sac, and a fetus with heartbeat are guidelines.
This change should decrease paperwork for both the officer and the traveler and will allow CBP to better optimize its resources.
Today's obstetrician gynecologist is required to interpret and in many cases perform ultrasound scans in the first trimester.
These cut-offs are accurate in a high percentage of patients with singleton pregnancies, but are subject to biologic as well single test error.
These outliers are not limited to multiple gestations.
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This includes, but is not limited to, power settings, basic orientation, and proper cleaning of ultrasound probes between uses.