1st Trimester Testing & Exams
Find a Conversation
1st Trimester Testing & Exams
| Mon, 07-09-2007 - 1:01pm |
Your First Trimester
Testing and Exams
During the first office visit, you will have a complete history and physical examination. This will include weight, blood pressure, urine specimen, uterine growth and pelvic exam.
We recommend that you have blood drawn for a panel of tests at the conclusion of your initial prenatal exam. Tests include:
- Complete blood count (CBC)
- Blood type and Rh factor
- Rubella titer
- HIV testing (you will need to sign a consent)
- Hepatitis B screening
- Syphilis
- Complete urinalysis (urine specimen)
Carrier Screening Tests
Individuals with an increased risk of passing on a genetic disease may have additional tests based on their ethnic background. Some of the diseases with a genetic basis include:
- Cystic Fibrosis -- Caucasians
- Sickle Cell Anemia -- African American
- Thalassemia -- Asian or Mediterranean descent
- Tay-Sachs or Canavan Disease -- Ashkenazi Jews
Ultrasound or Sonogram
An ultrasound may be used to evaluate many aspects of pregnancy at any time during pregnancy. In the first trimester, an ultrasound may be used to determine the size (age) and location of the embryo. Should vaginal bleeding occur, it can help us learn why. Ultrasound uses sound waves to produce an ultrasound "picture." In the first trimester, it is performed using an instrument placed on the vagina. This is called a transvaginal ultrasound. This test can usually be performed in the office. No harmful effects have been reported during more than two decades of use.
Chorionic Villus Sampling, or CVS
Chorionic villus refers to the part of the placenta that attaches to the lining of the uterus or womb. A sample of the placental tissue is removed to obtain a chromosome test. It is a relatively new test to diagnose certain chromosomal abnormalities and other types of serious birth defects. CVS or amniocentesis (second trimester test) is encouraged for mothers over 35 years old and those with certain family histories or prior reproductive problems. Your doctor and genetic counselor will help you select which test is best for you. CVS is performed during the 9th to 11th week of pregnancy and offers the advantage of an earlier and more rapid diagnosis than amniocentesis. However, there is a slightly increased risk of miscarriage.


