What are the early pregnancy tests?

NT examination is also known as fetal nuchal pellucid zone screening, which detects the thickness of fluid accumulation in subcutaneous tissue of fetal neck by means of B-ultrasound examination. Before 14 weeks of pregnancy, there will be temporary reflux of fetal upper limb lymph and thickening of pellucid zone. Through examination of pellucid zone, it can be judged whether there are chromosomal abnormalities in fetus.