An ultrasound schedule for pregnancy outlines when imaging scans occur throughout your prenatal care. In a typical uncomplicated pregnancy, most patients have between one and three ultrasounds. The two standard scheduled scans are the first trimester dating scan between weeks 8 and 12, and the 20-week anatomy scan between weeks 18 and 22. Additional third trimester scans are scheduled if you or your baby need closer monitoring.
At East Coast OBGYN, expectant parents from Brooklyn, Manhattan, Brighton Beach, Coney Island, Sheepshead Bay, and Gravesend receive attentive obstetrical care and clear guidance for every stage of pregnancy. Learn more about our obstetrics care in Brooklyn and Manhattan.
Typical ultrasound schedule for normal pregnancy
An ultrasound schedule for normal pregnancy usually includes two routine scans during the entire forty weeks. The first is an early dating ultrasound in the first trimester, and the second is a detailed anatomy scan around the halfway mark at twenty weeks. If both you and your baby remain healthy, additional routine ultrasounds are often not medically necessary.
Many first-time parents are surprised to learn that healthy pregnancies do not require an ultrasound at every prenatal visit. You will still hear your baby’s heartbeat at routine appointments using a handheld Doppler device starting around week ten or twelve. Your clinician also tracks your blood pressure, weight, urine, and fundal height at regular checkups. Having only two scheduled ultrasounds is actually reassuring news, as it indicates your pregnancy is progressing smoothly without complications.
The American College of Obstetricians and Gynecologists recommends ultrasound imaging only when there is a clear clinical reason. Ultrasound technology provides valuable diagnostic insights, but routine uncomplicated pregnancies thrive with standard clinical monitoring and targeted scans at key developmental milestones.
Typical ultrasound schedule for pregnancy: Trimester by trimester
A typical ultrasound schedule for pregnancy follows a structured timeline based on fetal development milestones. Early scans confirm viability, mid-pregnancy scans examine anatomy, and late-pregnancy scans evaluate fetal growth and placental function when indicated.
| Timing | Ultrasound Type | Primary Medical Goal | Typical Method |
|---|---|---|---|
| Weeks 6 to 9 | Early Dating & Viability Scan | Confirm heartbeat, gestational sac location, and due date | Transvaginal |
| Weeks 11 to 14 | First Trimester Screening / Nuchal Translucency | Measure fluid at back of baby’s neck and evaluate early structures | Transabdominal or Transvaginal |
| Weeks 18 to 22 | 20-Week Anatomy Scan (Level II) | Complete survey of organs, brain, heart, limbs, and placenta | Transabdominal |
| Weeks 32 to 36 | Third Trimester Growth Scan | Check baby’s size, growth percentile, and amniotic fluid volume | Transabdominal |
| Weeks 36 to Term | Biophysical Profile & Doppler Flow | Assess fetal movement, muscle tone, breathing, and placental blood flow | Transabdominal |
First trimester ultrasounds: Dating and viability
First trimester ultrasounds confirm that your pregnancy is located safely inside the uterus and determine how many weeks along you are. Most patients have their first scan between weeks seven and ten, though an earlier scan around week six may be scheduled if you have bleeding, cramping, or a history of ectopic pregnancy.
During this early visit, your doctor measures the crown-rump length, which is the distance from the top of your baby’s head to the bottom of the torso. This measurement gives the most accurate estimate of your gestational age and establishes your official estimated due date. The sonographer also confirms the fetal heartbeat, checks whether you are carrying twins or higher multiples, and inspects your ovaries and fallopian tubes.
Many early scans use a transvaginal ultrasound probe because the uterus is still tucked deep inside your pelvic bone. A transvaginal scan brings the sound waves much closer to the gestational sac, producing clearer images in the earliest weeks. You can read more about preparing for your first visit in our guide to what to expect at your first prenatal appointment.
Between weeks eleven and fourteen, some patients choose to have a nuchal translucency scan. This optional screening uses ultrasound to measure the small clear space in the tissue at the back of your baby’s neck. When combined with a maternal blood test or cell-free DNA screening, it provides an early assessment of the risk for chromosomal conditions such as Down syndrome.
The 20-week anatomy scan: What your OBGYN evaluates
The 20-week anatomy scan, also called a mid-pregnancy scan or level two ultrasound, is the most thorough ultrasound examination of your pregnancy. Scheduled between weeks 18 and 22, this scan evaluates your baby’s physical development from head to toe, checks the position of the placenta, and assesses the volume of amniotic fluid.
During this appointment, the sonographer captures detailed measurements and images of every major body system. The evaluation includes:
- Brain ventricles, cerebellum, and skull shape
- Facial profile, including the nose, upper lip, and palate
- Heart structure, including four chambers and major outflow vessels
- Spine alignment and skin covering
- Stomach, kidneys, bladder, and diaphragm
- Arms, legs, hands, feet, fingers, and toes
- Umbilical cord insertion and vessel count
- Placenta location relative to the cervix to check for placenta previa
It is very common for expectant parents to feel nervousness before this visit, a feeling many parents describe as scan anxiety. It helps to remember that the vast majority of anatomy scans show healthy development.
If your sonographer spends extra time on a specific area, asks you to turn on your side, or recommends taking a short walk, do not assume something is wrong. Babies frequently curl into corners, turn toward the mother’s spine, or cover their faces with their hands. If certain views cannot be completed because of the baby’s position, your OBGYN will simply schedule a short follow-up scan in one or two weeks to check the remaining angles.
Third trimester ultrasounds: Growth scans and fetal well-being
Third trimester ultrasounds are not always scheduled for low-risk pregnancies, but they are common when your doctor needs to check fetal growth, baby positioning, or amniotic fluid levels. These scans usually take place between weeks 32 and 36.
During a third trimester growth scan, the sonographer measures your baby’s head circumference, biparietal diameter, abdominal circumference, and femur length. A computer formula combines these numbers to estimate your baby’s current weight and assigns a growth percentile. Your clinician compares this estimate with your earlier scans to confirm that your baby is growing steadily along an appropriate curve.
Late pregnancy imaging also checks fetal presentation. Knowing whether your baby is head down (cephalic) or bottom down (breech) helps your care team plan for labor and delivery. The sonographer also measures the amniotic fluid index, ensuring that your baby has plenty of cushioning fluid surrounding them.
In some situations, your doctor may order a biophysical profile, also known as a BPP. A BPP combines an ultrasound with fetal heart rate monitoring to score fetal breathing movements, body movements, muscle tone, and amniotic fluid volume. If there are questions about how well the placenta is supporting your baby, an umbilical artery Doppler ultrasound can measure the resistance of blood flowing between the placenta and your baby.
When an OBGYN orders extra ultrasounds: High-risk pregnancy schedule
Your OBGYN may order extra scheduled ultrasounds during pregnancy if you have certain medical risk factors or if an issue arises on an earlier scan. In a higher risk pregnancy, having serial ultrasounds every two to four weeks is a proactive tool that allows your obstetrical team to closely monitor your health and your baby’s development.
Common reasons for extra pregnancy ultrasounds include:
- Maternal age 35 or older at the time of delivery
- Carrying twins, triplets, or higher order multiples
- Pre-existing medical conditions like chronic hypertension, kidney disease, or autoimmune disorders
- Pregnancy complications such as gestational diabetes, preeclampsia, or cholestasis
- Suspected fetal growth restriction, where a baby measures smaller than expected
- Macrosomia, where a baby measures significantly larger than average
- Low-lying placenta, marginal previa, or complete placenta previa detected at the 20-week scan
- Previous pregnancy complications, including preterm birth or recurrent loss
In complex cases, your OBGYN may co-manage your care with a Maternal-Fetal Medicine specialist, also known as a perinatologist, to conduct targeted high-resolution scans. To understand how specialized care works and what steps protect you and your baby, read our complete high-risk pregnancy guide. You can also review our general prenatal care guide for an overview of routine visits, lab work, and screening schedules.
Transvaginal vs. abdominal ultrasounds: What to expect
Pregnancy ultrasounds are safe, non-invasive imaging tests performed either through the abdomen or through the vagina. Understanding how each method works helps you know what to expect during your appointment.
An abdominal ultrasound is the method used for almost all second and third trimester scans. You recline on an exam table, and the sonographer applies warm, water-based gel to your lower abdomen. A handheld device called a transducer is guided across your skin, sending sound waves into the pelvic area that bounce back to create real-time images on a monitor. For scans before fourteen weeks, you may be asked to arrive with a full bladder to help lift the uterus into better view. For later scans, an empty bladder is usually preferred.
A transvaginal ultrasound involves inserting a slender, lubricated probe a few inches into the vaginal canal. While this may feel slightly awkward or cause mild pressure similar to a pelvic exam, it is not typically painful. Transvaginal imaging is standard during early pregnancy because sound waves do not have to travel through abdominal tissue, providing sharp, high-resolution views of early fetal structures, cardiac activity, and cervical length.
Diagnostic ultrasound uses sound waves, not ionizing radiation like X-rays. Medical organizations around the world confirm that diagnostic prenatal ultrasound has an established safety record when performed by qualified healthcare providers for medical purposes.
Prenatal and obstetrical care in Brooklyn and Manhattan
East Coast OBGYN provides comprehensive, compassionate obstetrical care for patients across New York City. From your first positive pregnancy test through delivery and postpartum recovery, Dr. Mark Vaynkhadler and our clinical team provide personalized attention, modern ultrasound monitoring, and thorough counseling.
Whether you need routine low-risk prenatal monitoring or specialized high-risk surveillance, our team coordinates your scans, explains every finding in plain language, and answers your questions with respect. If you ever experience sudden bleeding, severe cramping, decreased fetal movement, or persistent headaches, review the five warning signs during pregnancy you should never ignore and contact your doctor immediately.
To begin your prenatal care or transfer your obstetrical visits, schedule an obstetrics care appointment or contact East Coast OBGYN to speak with our care team today.
Frequently asked questions about pregnancy ultrasound schedules
How many ultrasounds are normal during a healthy pregnancy?
Most healthy, low-risk pregnancies include one to three ultrasounds. The most standard schedule includes an initial dating scan in the first trimester and a comprehensive anatomy scan around 20 weeks. Additional scans are scheduled only if a medical indication arises.
When do you get your first ultrasound during pregnancy?
Most patients receive their first ultrasound between weeks 7 and 10 of pregnancy. This initial scan confirms a viable intrauterine pregnancy, checks the baby’s heartbeat, and establishes an accurate due date by measuring crown-rump length.
What happens if the baby does not cooperate during the 20-week anatomy scan?
If your baby is curled up, facing your spine, or blocking key views, your ultrasound technician may ask you to move or take a short walk. If views remain incomplete, your OBGYN will schedule a follow-up scan to finish the evaluation.
Can frequent ultrasounds harm the baby?
Diagnostic ultrasound uses sound waves rather than ionizing radiation and does not harm your baby. Medical professionals perform scans only when clinically indicated to gather important health information while adhering to standard medical safety guidelines.
Why do some pregnant women have an ultrasound at every visit?
Women receiving ultrasounds at every visit typically have high-risk conditions such as twins, gestational diabetes, hypertension, or advanced maternal age. In low-risk pregnancies, routine checks rely primarily on fetal heart Doppler, fundal height, and blood pressure.