Description
Serum, NA, Fasting or Non Fasting: As suggested by doctor
Sample Required:
The Double Marker Test requires a blood sample. This sample is typically collected from a pregnant woman, usually via a standard blood draw from a vein in the arm.
Test Time:
The results of the Double Marker Test are usually available within a few days to a week, depending on the laboratory and healthcare facility.
Test Normal Range:
The normal range for the markers measured in the Double Marker Test can vary based on factors such as gestational age and the specific reference values used by the laboratory. Your healthcare provider will interpret your results based on these reference values.
What is the Test?
The Double Marker Test is a prenatal screening test used to assess the risk of certain chromosomal abnormalities in a developing fetus. It measures the levels of two specific markers in a pregnant woman’s blood:
Pregnancy-associated plasma protein-A (PAPP-A)
Free beta-human chorionic gonadotropin (beta-hCG)
These markers, when measured in combination with information like maternal age and gestational age, can help identify pregnancies at higher risk for conditions such as Down syndrome (Trisomy 21) and Edwards syndrome (Trisomy 18).
Test Procedure:
A healthcare provider or phlebotomist cleans the injection site (usually the arm) with an antiseptic. A needle is used to draw a blood sample from a vein. The blood sample is sent to a laboratory where it is analyzed to measure the levels of PAPP-A and free beta-hCG.
When to Take the Test:
The Double Marker Test is typically performed between the 9th and 13th weeks of pregnancy, although the exact timing can vary based on healthcare provider recommendations.
Who Should Take This Test:
The Double Marker Test is often offered to pregnant women, especially those with certain risk factors or concerns about fetal chromosomal abnormalities. It is an optional test, and whether to undergo it is a personal decision.
Precautions for Exceptional Cases (Pregnancy, etc.):
The Double Marker Test is generally safe for pregnant individuals. However, it’s essential to inform your healthcare provider about any medical conditions, medications, or previous pregnancy history that might affect the test results.
FAQs (Frequently Asked Questions):
Q1: What conditions does the Double Marker Test screen for?
A: This test primarily screens for chromosomal abnormalities, particularly Down syndrome (Trisomy 21) and Edwards syndrome (Trisomy 18).
Q2: How accurate is the Double Marker Test in detecting chromosomal abnormalities?
A: While it can indicate an increased risk, it is not a definitive diagnostic test. If the test suggests an elevated risk, additional diagnostic tests like amniocentesis or chorionic villus sampling (CVS) may be recommended for confirmation.
Q3: Is the Double Marker Test mandatory during pregnancy?
A: No, the Double Marker Test is an optional screening test. The decision to undergo this test is made by the pregnant individual after discussing it with their healthcare provider.
Q4: Can the Double Marker Test provide false-positive or false-negative results?
A: Yes, like many screening tests, the Double Marker Test can yield false-positive or false-negative results. Positive results indicate an increased risk, but further diagnostic testing is needed for confirmation.
Q5: Are there any risks associated with the Double Marker Test?
A: The test itself is considered low-risk, involving a routine blood draw. However, if the results suggest an increased risk, further diagnostic procedures carry some associated risks, which should be discussed with your healthcare provider.
