Understanding Fetal Viability
When you come in for an ultrasound at one of our clinics, one of the things we check for is fetal viability – but what does that mean? Essentially, it means that the pregnancy is developing normally and is on track with certain benchmarks of other fetuses at the same gestational age. It also consists of looking at the location of the embryo, as a condition like an ectopic pregnancy means that the pregnancy will never be able to develop properly and is therefore not viable. There is also the age of fetal viability, which is the point in pregnancy when a baby can survive outside the womb with or without medical support. In many cases, this begins around 24 weeks of gestation. However, every pregnancy is different, and the exact week can shift based on several factors. Knowing about viability can help you make informed decisions and will give you a clearer look at your options. Community Pregnancy Clinics is here to share information so you can feel supported and confident.
What are They Looking for in a Fetal Viability Scan?
During the first pregnancy ultrasound, often called the “viability scan” or early pregnancy scan, ultrasound technicians focus on several key indicators that help confirm whether the pregnancy is developing normally. One of the first things they look for is the gestational sac, which should be visible within the uterus by around five weeks of pregnancy. The presence and size of the sac help confirm that the pregnancy is located in the uterus and not ectopic (outside the uterus). They also check for the yolk sac, which provides early nourishment to the embryo and is a reassuring sign that the pregnancy is progressing. As the scan continues, the embryo or fetal pole should become visible, and measurements are taken to estimate gestational age and assess growth.
Another critical factor ultrasound techs assess is the fetal heartbeat, typically detectable by transvaginal ultrasound around six weeks of gestation. A steady heartbeat within the normal range is one of the strongest indicators of fetal viability. In addition to checking for a heartbeat, technicians also examine the shape and position of the gestational sac, the condition of the uterus and ovaries, and any signs of internal bleeding or abnormalities that could indicate potential complications, such as miscarriage or ectopic pregnancy. Together, these findings give both the technician and the healthcare provider valuable insight into how the pregnancy is progressing and help ensure that appropriate care and follow-up are provided.
The Viability of Ectopic Pregnancies
Ectopic pregnancies are not viable because the fertilized egg implants and begins to grow outside the uterus—most commonly in one of the fallopian tubes, though it can also occur in the cervix, ovary, or abdominal cavity. The uterus is the only place in a woman’s body designed to safely support a growing pregnancy; it can expand and nourish the embryo as it develops. In contrast, the fallopian tubes and other structures are too narrow and lack the proper lining and blood supply needed for fetal growth. As the embryo grows, it can cause the tube or surrounding tissue to stretch and eventually rupture, leading to severe internal bleeding, infection, and potentially life-threatening complications for the woman.
Because the embryo cannot survive outside the uterus and the condition poses serious health risks, an ectopic pregnancy is considered nonviable and requires prompt medical attention. Detecting an ectopic pregnancy early through ultrasound and blood tests is critical for protecting the woman’s health and preserving her future fertility. Treatment typically involves medication or surgery to remove the ectopic tissue and prevent further harm.
Note that treatment for an ectopic pregnancy is not considered an abortion and is legal everywhere, despite your state’s abortion laws. It is also important to note that taking the abortion pill while experiencing an ectopic pregnancy is harmful to your health and not effective.
Factors That Affect The Age of Viability
The main factor in fetal viability is how developed the lungs are, since breathing is critical after birth. Other important factors include birth weight and access to a neonatal intensive care unit (NICU). Each element plays a role in whether a preterm baby can thrive outside the womb.
Here are key factors in a baby’s survival outside the womb:
- Gestational age at birth
- Lung maturity and breathing ability
- Birth weight and overall physical development
- Quality of medical care and NICU availability
- Presence of infections or other health issues
Medically, survival rates rise significantly as weeks go by. For example, babies born at 22 weeks have a small chance of survival. That rate jumps near 50 percent by 24 weeks and over 80 percent by 26 weeks when cared for in top NICUs.
Support and Resources at Community Pregnancy Clinics
Community Pregnancy Clinics provides free services that help you understand your options and health. You can get a no-cost ultrasound to confirm how far along you are and to learn about viability in your unique situation. All our staff are trained to answer your questions with respect and kindness. Call today to schedule your ultrasound appointment.