Advances in Genetic Carrier Screening
Previously, genetic screening was primarily recommended for individuals who belonged to specific ethnic groups. However, current guidelines suggest that all couples should be given the opportunity to undergo this testing. In the past, it was sufficient for only one parent to be tested, and the other parent would only be tested if the initial result was positive. This approach was based on the understanding that most genetic conditions would only affect the baby if both parents were carriers of the same genetic variant.
Fortunately, genetic carrier screening has become a quick and efficient process. Doctors can now collect a sample of saliva or skin cells from the inside of the cheek to perform the screening. In some cases, a blood draw may be necessary. If this is the case, the screening can be conveniently conducted during the routine blood test that is typically done early in pregnancy.
Serum Blood Test: Measuring Pregnancy-Associated Plasma Protein-A and Human Chorionic Gonadotropin
A serum blood test is a diagnostic tool used to measure the levels of pregnancy-associated plasma protein-A (PAPP-A) and human chorionic gonadotropin (hCG) in the blood. This test is particularly useful in early pregnancy as abnormal levels of these proteins can indicate chromosomal abnormalities in the fetus.
If the results of a serum blood test are concerning, further testing may be recommended by the doctor. These additional tests may include chorionic villus sampling, cell-free fetal DNA testing, or amniocentesis. These procedures provide more detailed information about the chromosomes and overall health of the developing baby.
It is important to note that a serum blood test alone cannot provide a definitive diagnosis of chromosomal abnormalities. However, it serves as an important screening tool that can help identify potential concerns early on, allowing for timely intervention and appropriate medical care.