A double marker screening test is a test performed early in pregnancy that assesses a baby's risk of chromosomal abnormalities. This test, which is generally not mandatory, may be considered by expectant mothers after learning of their pregnancy. The procedure involves a simple blood draw and carries no side effects or risks to the pregnancy or the baby's health.

This test is performed by examining a prospective mother's blood sample in a laboratory. The test result can determine the baby's risk of chromosomal abnormalities. However, this test does not provide a definitive diagnosis; it only identifies potential risks.

During pregnancy, expectant mothers often experience the excitement of sharing their pregnancy news with others and the process of adjusting to the feeling of motherhood. Over time, issues such as the baby's health, gender, and genetic similarities become a priority. However, some questions may not be answered before birth.

Pregnancy is a crucial period during which expectant mothers must adapt to hormonal and physical changes. It's especially important to be monitored by a specialist gynecologist and obstetrician. These specialists not only monitor the mother's health but also closely monitor the baby's development.

A double marker screening test is a test performed during the first trimester of pregnancy. This test can help determine a baby's risk of chromosomal abnormalities. However, it does not provide a definitive diagnosis. This test, performed by taking a blood sample, has no risks or significant side effects.

When is the double marker test performed?

The Double Marker Screening Test is a test that can be performed during pregnancy, but it is not mandatory. However, it is recommended in the following cases:

• If you are 35 years old or older,
• If there is a family member with a chromosomal disease,
• If you have a consanguineous marriage,
• If you are thought to have a high chromosomal risk,

These conditions are among the criteria that suggest a double marker test. However, even if you have these conditions, you are not required to undergo the test. Therefore, you may need to carefully consider the significance of the result before making a decision. It's also important to remember that a double marker test doesn't provide a definitive diagnosis; it only indicates potential risks.

There is a specific time window for the double marker test, and it's important not to miss it. A pregnancy consists of 40 weeks and three trimesters. The first trimester is the beginning of pregnancy and covers the 13th week. The second trimester is from 14 to 26 weeks, and the third trimester is from week 27 onward. The double marker test is usually performed between the end of the first trimester and the beginning of the second trimester, more specifically between weeks 11 and 14. Therefore, it's important to perform the test within this timeframe.

However, every pregnancy is different, and medical recommendations may vary based on your doctor's recommendations. Therefore, it's best to talk to your healthcare provider for more information about these types of tests and timing.

How is a double marker test performed?

The Double Marker Screening Test is a screening test performed during pregnancy that helps identify congenital conditions in the baby. This test, usually performed as part of a first-trimester screening, includes an ultrasound and blood tests.

• Ultrasound examination: This stage focuses on specific areas, such as the nuchal translucency and nasal bone. The nuchal translucency checks for signs such as fluid accumulation or thickening in the baby's nape. The nasal bone is examined because this area may not be visible in babies with certain chromosomal abnormalities.
• Blood test (Double-Counterfeit test): This test is performed by examining a blood sample taken from the mother. The double-counterfeit test measures two substances associated with pregnancy. The first is plasma protein A levels. Abnormal levels of this protein, produced by the placenta, can be associated with chromosomal disorders. The other substance measured is chorionic gonadotropin. This is a hormone secreted by the placenta, and excessive secretion can be associated with genetic abnormalities.

First-trimester screening is usually performed by combining a double-blind screening test and an ultrasound. These tests can help identify genetic conditions, particularly chromosomal abnormalities such as Down syndrome and trisomy 18. However, these tests do not provide a definitive diagnosis; they only indicate potential risks.

If the results of these tests are abnormal, doctors may refer you for further investigation. More detailed tests, such as chorionic villus sampling, amniocentesis, and cell-free fetal DNA, can be used to make a definitive diagnosis. Therefore, when test results are abnormal, further evaluation is important. It is important to communicate with a qualified healthcare professional during this time to develop the appropriate treatment plan.

What do double test results mean?

Double marker test results generally indicate a baby's risk for genetic diseases. High beta-hCG levels, low PAPP-A levels, and developmental parameters such as nuchal translucency and crown-rump length outside the normal range may indicate a baby is at high risk for genetic diseases.

The double marker screening test is known to be 85% accurate in detecting genetic disorders like Down syndrome. However, this test can also produce false-positive results. In these cases, further testing may be necessary to confirm a positive result. Similarly, a low-risk test result does not necessarily mean that the baby is free of the disease.

The test result is usually calculated as a risk score using computer programs, and the baby is monitored based on this score. Therefore, it's important to interpret the test results and consult your doctor for further testing if necessary. It's important to remember that the results are only helpful in determining risk, rather than providing a definitive diagnosis.

What happens if the double marker test result is high?

A high double marker test result generally indicates a baby is at high risk for genetic diseases, but it doesn't provide a definitive diagnosis. In this case, further testing may be necessary to determine the baby's potential risks and conduct a more detailed evaluation. High-risk results typically include the following steps:

• Counseling and information: Your doctor or a genetic counselor will explain the high-risk result to you and work with you to plan next steps. They will offer emotional and informational support along the way.
• Further testing: High-risk results may require further testing, such as amniocentesis or chorionic villus sampling, for more definitive diagnoses. These tests allow for a more detailed examination of the baby's genetic makeup.
• Third-party consultation: Specialists may collaborate with third parties, typically geneticists or perinatologists, to further evaluate the high-risk condition.
• Pregnancy monitoring: High-risk results may require more close monitoring of the baby's development. In this case, more frequent ultrasounds or other follow-up tests may be performed.

Every situation is different, and the next steps after a high-risk result can depend on many factors, including the expectant mother's medical history, risks, and preferences. Therefore, it's important to stay in touch with your doctor to determine the best next step when you receive a high-risk result.

Can the gender of the baby be determined in the double marker test?

A double marker screening test is typically performed to assess a baby's risk of genetic diseases and is not intended to determine the baby's sex. A double marker screening test measures specific proteins and hormones in the mother's blood and is used to assess the risk of genetic abnormalities.

Ultrasound or genetic testing is used to determine the sex of a baby. An ultrasound, typically performed between weeks 18 and 20 of pregnancy, can determine the baby's sex. Additionally, genetic testing such as amniocentesis or chorionic villus sampling can provide more accurate sex determination.

While the double marker screening test focuses on determining the risk of genetic diseases, it is used to assess a baby's genetic status, not to determine their sex. Therefore, the double marker screening test is generally performed to assess the risk of genetic abnormalities, not to determine gender.