First Trimester Screening

What is a First Trimester Screening?

A first trimester screening, performed roughly between 11-13 weeks of pregnancy, is used to detect chromosomal abnormalities such as Down's Syndrome, Edwards' Syndrome and Patau's Syndrome. It involves two parts, a blood test and an ultrasound screening referred to as a ‘Nuchal Scan’ or ‘Nuchal Translucency Screening.’ The screening helps your OB/GYN determine the fetus’ risk of these abnormalities.

How is a Nuchal Scan Performed?

A nuchal scan is done by ultrasound. The ultrasound technician will measure the amount of fluid in the back of the baby's neck. While all babies have some fluid in the back of their necks, the presence of excess fluid in the back of a baby's neck can be a symptom of an abnormality.

When Is a Nuchal Scan Performed?

Nuchal scans are generally performed between 11 and 14 weeks gestation. Tests completed before or after this range are not as accurate.

How Accurate are Nuchal Scans?

Nuchal scans are screening tests - not diagnostic tests. This means that they can be used to assess the risk or likelihood that your baby has an abnormality, but they cannot be used to diagnose a condition. If your nuchal scan does detect an abnormality, you will then have the option to pursue further diagnostic testing.

First trimester combined screenings typically detect Down Syndrome 85 percent of the time. However, they also give a false positive 5 percent of the time, meaning that they indicate an abnormality that doesn't exist.

What Should I Do If My Nuchal Scan Comes Back Positive?

If your nuchal scan indicates that there might be an abnormality, the first thing you need to do is try to relax. Just because the scan says something could be wrong with your baby's chromosomes does not necessarily mean that something is.

At this point, you will likely have the option to pursue diagnostic testing such as chorionic villus sampling or amniocentesis for a better understanding of what is going on. These tests do come with increased risks, however, so you will want to talk to your doctor to find out which course of action is best for you.

What Risks are Associated with Nuchal Scans?

Nuchal scans themselves present no known risks. However, receiving a false positive can lead to undue anxiety and more testing.

Nuchal scans are routine and relatively risk-free, so if your doctor recommends one, do not be alarmed. He or she is likely just checking to be sure.

Contact Us

Bay Area OB/GYN is conveniently located in Webster, Texas. There is plenty of free parking available. Our professional staff is ready to set your appointments and provide you with answers. Please call our office at (281) 332-9511 or request an appointment online or visit our secure practice portal at http://myhealthrecord.com Please contact the office for your secure personal pin number.

Bay Area OB/GYN
17 Professional Park
Webster, Texas 77598
Phone: (281) 332-9511
Fax: (281) 332-6685
Website: www.baobgyn.com or visit our secure practice portal at https://bayareaobgyn.portalforpatients.com

Office Hours

Our office hours are Monday through Thursday from 8 AM to 5 PM. We are open from 8 AM to 3 PM on Friday.

Medical Emergencies

In the event of a life threatening medical emergency, call medical emergency services at 911 immediately. DO NOT WAIT! Inform the emergency room staff that you are a patient of Bay Area OB/GYN, and they will contact us

After Hours Urgent Medical Needs

If you have an urgent medical need and need to talk to our OB/GYN doctors after our regular hours, please call Bay Area OB/GYN at (281) 332-9511. A doctor is on-call 24 hours a day. Your call will be returned promptly.

Insurance & Payment

We accept most major insurance carriers. Please call our billing specialists at (281) 332-9511 if you have any questions.

Hospital Affiliations

Our OB/GYN doctors are affiliated with Clear Lake Regional Medical Center, Memorial Hermann Southeast, Bay Area Regional Medical Center and Bay Area Surgical Center in Texas.

Call 281-332-9511 or request an appointment online at Bay Area OB/GYN in Webster, Texas.

Bay Area OB/GYN

Office Hours
Monday:8:00 AM - 5:00 PM
Tuesday:8:00 AM - 5:00 PM
Wednesday:8:00 AM - 5:00 PM
Thursday:8:00 AM - 5:00 PM
Friday:8:00 AM - 3:00 PM
Saturday:Closed
Sunday:Closed