Analysis of Maternal Serum | The Causes of False Alarm
Keep in mind that the test measures the risk and potential false positives can occur. Among the causes of these false alarms can be:
The miscalculation of gestational age is not always known as the time of ovulation and conception, can miscalculate gestational week in which the test is performed (eg, counting from the first day of last menstruation that would not have the previous two weeks from ovulation to the beginning of the period). Since the values of these substances fluctuate from week to week, levels may correspond or not and hence the false positive.
Problems with the placenta, the baby may be producing normal levels of these substances, but the placenta may not adequately filter the blood stream (blood).
Normal variations: the levels of hormones measured in the test but may represent normal variations may fall outside what is considered “normal” in most cases.
Many women who have had abnormal results on this test end up having healthy babies. The proof, again, is only used to determine the risk of problems in pregnancy and the need for further exploration. The obstetrician will discuss with parents the options available: consult a geneticist, and / or genetic amniocentesis may help confirm or rule out the result.
Amniocentesis is a procedure that involves inserting into the womb of the mother a very thin needle to remove a sample of amniotic fluid, the fluid that surrounds and protects the baby during pregnancy. This fluid contains fetal cells and various chemicals produced by the baby. In analyzing the liquid can be known with certainty not only the sex of the baby, but if you suffer from genetic abnormalities such as Down syndrome and spina bifida. But since this is an invasive procedure, has some risks, such as to cause pregnancy loss (which is very small, but there is 0.5%). Ask any questions you have if you need it.
The couple with the help of your doctor should consider this possibility to find out for sure and be better prepared to face the decision on the future of the pregnancy or require special care a baby with these health conditions. If necessary, request a second opinion.
If you are pregnant, clinical trials are vital to monitor your health and your baby. Do not skip any. The health of your baby and your own peace of mind are at stake.