Mean sac diameter | Radiology Reference Article | Radiopaedia.org
What Is the Yolk Sac During Pregnancy? | babyMed.com
Reference intervals of gestational sac, yolk sac, embryonic length, embryonic heart rate at 6–10 weeks after in vitro fertilization-embryo transfer | BMC Pregnancy and Childbirth | Full Text
Fetal sex prediction measuring yolk sac size and yolk sac–fetal pole distance in the first trimester via ultrasound screening | SpringerLink
Measurement Of Gestational Age
External validation of a simple scoring system to predict pregnancy viability in women presenting to an early pregnancy assessment clinic | HKMJ