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Medically Reviewed By

Dr. Srinivas

MBBS, DCP, DNB Pathology

Pathology · Last reviewed: June 2026

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QUADRUPLE MARKER: AFP,BHCG,UE3,INHIBIN A

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About this test

QUADRUPLE MARKER: AFP,BHCG,UE3,INHIBIN A

QUADRUPLE MARKER: AFP,BHCG,UE3,INHIBIN A is a specialized diagnostic prenatal screening test designed to measure four specific biochemical markers in a pregnant woman's blood: Alpha-Fetoprotein (AFP), Beta-Human Chorionic Gonadotropin (beta-hCG), Unconjugated Estriol (uE3), and Inhibin-A. This second-trimester screening panel is essential for assessing the risk of chromosomal abnormalities such as Down syndrome (Trisomy 21), Edwards syndrome (Trisomy 18), and open neural tube defects like spina bifida.

Measurement of these four prenatal biochemical markers provides direct clinical insight into fetal development and chromosomal risk stratification. Because early risk assessment supports timely prenatal counseling and diagnostic confirmation, specialized biochemical testing supplies essential clinical data for obstetrics, maternal-fetal medicine, genetics, and prenatal care evaluations.

The test requires a blood specimen collected by a qualified person using standard serum containers under appropriate clinical conditions during the second trimester (typically between 15 and 20 weeks of pregnancy), followed by precise analysis using automated laboratory immunoassay techniques. Results must always be interpreted in conjunction with the patient's age, weight, gestational age, and ultrasound findings.

Benefits of QUADRUPLE MARKER: AFP,BHCG,UE3,INHIBIN A Testing

  • Provides a comprehensive second-trimester assessment for chromosomal and neural tube defects.
  • Helps screen for Down syndrome, Trisomy 18, and spina bifida with high sensitivity.
  • Assists obstetricians and maternal-fetal medicine specialists in prenatal risk stratification.
  • Aids in evaluating fetal development and placental protein status.
  • Supports tracking of specialized maternal wellness and high-risk pregnancy care plans.
  • Complements detailed anomaly ultrasound scans and nuchal translucency screenings.
  • Utilizes precise laboratory immunoassay techniques for reliable quantitative results.
  • Assists specialists in determining appropriate follow-up diagnostic options like amniocentesis.
  • Provides dependable turnaround times to support specialized clinical care.
  • Utilizes standard venous blood collection procedures under medical supervision.

Clinical Indications and Applications

Prenatal Screening: The primary clinical indication is screening pregnant women during the second trimester (weeks 15 through 20) to assess the risk of fetal chromosomal abnormalities and neural tube defects.

Clinical Assessment: The test is utilized when performing comprehensive maternal-fetal risk evaluations in specialized obstetric settings.

Why Doctors Recommend This Test

Obstetricians, gynecologists, maternal-fetal medicine specialists, and genetic counselors recommend this test as part of routine or high-risk prenatal screening protocols. It delivers essential statistical risk data required to guide safe clinical counseling and intervention.

Following proper gestational age verification and blood collection guidelines will ensure a smooth and efficient testing procedure.

What Happens During The Procedure?

The collection procedure involves obtaining a blood specimen drawn from a vein by a qualified phlebotomist using a clean, standard collection container provided by the healthcare facility under appropriate supervision protocols.

Once obtained, the sample is tested in the laboratory using advanced immunoassay analyzers to quantify AFP, beta-hCG, uE3, and Inhibin-A concentrations. The procedure takes only a few minutes.

Normal Reporting Time

The report for the QUADRUPLE MARKER: AFP,BHCG,UE3,INHIBIN A test is generally available within 24 to 48 hours due to standard laboratory processing times. Results must be reviewed promptly with the referring obstetrician, genetic counselor, or specialist.

Who Should Consider This Test?

  • Pregnant women between 15 and 20 weeks of gestation seeking comprehensive chromosomal screening.
  • Expectant mothers evaluated for birth defect risks as directed by their obstetrician or geneticist.

Understanding Test Results

Test results provide calculated risk probabilities based on biomarker levels adjusted for maternal age, weight, and exact gestational age.

Normal/Low-Risk Findings: Screen-negative results indicate a lower statistical risk for Down syndrome and neural tube defects.

Abnormal/High-Risk Findings: Screen-positive results indicate an increased statistical risk, signaling the need for further diagnostic evaluation, such as genetic counseling or an amniocentesis.

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Clinical Limitations

The quadruple marker test is a screening test, not a definitive diagnostic test; screen-positive results require confirmation through diagnostic procedures like amniocentesis.

Important Safety Information

Severe pregnancy complications, abnormal pain, or bleeding require immediate medical attention. Patients must consult their healthcare provider or obstetrician to interpret prenatal screening reports.

Test FAQs

What is the Quadruple Marker test?

It is a specialized second-trimester prenatal blood test that measures four markers (AFP, beta-hCG, uE3, and Inhibin-A) to screen for Down syndrome, Trisomy 18, and neural tube defects.

When is the best time to take this test?

The test is ideally performed between the 15th and 20th weeks of pregnancy, with weeks 16 to 18 being the optimal window for accuracy.

Why is a blood sample used for this test?

A blood sample allows precise laboratory measurement of specific fetal and placental proteins circulating in the maternal bloodstream.

Do I need to fast before taking this test?

Fasting is generally not required for a quadruple marker blood test; follow specific instructions provided by your obstetrician or clinic.

How is the sample collected for this test?

The sample is collected as a standard venous blood draw performed by a qualified phlebotomist.

What does a high or low marker level indicate?

Abnormal levels of these markers do not mean the baby definitely has a defect, but rather indicate an increased statistical risk that requires further testing.

When will my test report be ready?

Reports are generally available within 24 to 48 hours following sample collection.

Is this test definitive or just a screening?

This is a screening test designed to assess risk probabilities; a screen-positive result must be confirmed with diagnostic tests like an amniocentesis.

Why is gestational age crucial for this test?

Marker levels change significantly week by week during pregnancy, so precise dating via ultrasound is essential to calculate accurate risk scores.

What should I do if my test result is screen-positive?

You should promptly consult your obstetrician, maternal-fetal medicine specialist, or genetic counselor to discuss the findings and explore appropriate diagnostic options.

QUADRUPLE MARKER: AFP,BHCG,UE3,INHIBIN A

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