（e）1. Approximately what percentage of abortions occur in the first-trimester? (a)30% (b)50% (c)70% (d)75% (e)80% Spontaneous abortion (SAb), also known as miscarriage, refers to a pregnancy that ends spontaneously before the fetus has reached a viable gestational age. SAb is the most common complication of early pregnancy. Eight to 20 percent of clinically recognized pregnancies under 20 weeks of gestation will undergo SAb; 80 percent of these occur in the first 12 weeks of gestation.The overall risk of SAb after 15 weeks is low (about 0.6 percent) ……from UpToDate…『Spontaneous abortion: Risk factors, etiology, clinical manifestations, and diagnostic evaluation 』 （d）2. Approximately what percentage of spontaneous first-trimester abortions show chromosomal abnormalities? (a) 1%(b)10% (c)25% (d)50% (e)75 % (p.25右上)……感谢恩慈找答案 --

※ 发信站: 批踢踢实业坊(ptt.cc) ◆ From: 203.67.207.154