Quadruple Marker Test: What It Measures, Normal Range and Cost

Is there a reliable way to assess your baby’s risk for chromosomal and developmental conditions early in pregnancy, before complications arise? Modern prenatal care offers structured, evidence-based screening tools that provide meaningful insight into fetal health, and the quadruple marker test is one of the most important second-trimester assessments available today.

Also known as the quadruple test or quad test, the pregnancy screening test measures four critical biochemical substances in the mother’s blood between 15 and 20 weeks of gestation. These include Alpha-fetoprotein (AFP), Human Chorionic Gonadotropin (hCG), Unconjugated Estriol (uE3), and Inhibin-A. The combined levels of these markers help estimate the risk of chromosomal abnormalities, such as Down syndrome (Trisomy 21) and Edwards syndrome (Trisomy 18), as well as neural tube defects, such as spina bifida.

Globally, congenital anomalies affect approximately 3–6% of all births, and chromosomal abnormalities like Down syndrome occur in nearly 1 in 700 live births worldwide, with risk increasing significantly with maternal age. Clinical studies indicate that second-trimester quadruple screening can detect up to 85% of Down syndrome cases, particularly when combined with maternal age and ultrasound findings.

As prenatal care standards continue to evolve, the quadruple marker test remains a safe, non-invasive, and clinically valuable screening method that helps families and clinicians make informed decisions regarding further diagnostic evaluation and pregnancy management.

What is the Quadruple Marker Test?

The quadruple marker test is a maternal serum screening test performed during the second trimester, typically between 15 and 20 weeks of pregnancy, with optimal accuracy around 16–18 weeks.

It measures four substances:

• AFP (Alpha-fetoprotein): Produced by the fetal liver
• hCG (Human Chorionic Gonadotropin): A hormone released by the placenta
• Unconjugated Estriol (uE3): Produced by both the fetus and placenta
• Inhibin-A: A hormone secreted by the placenta

Abnormal patterns in these marker levels may indicate an increased likelihood of chromosomal abnormalities or structural defects. Importantly, this is a screening test, not a diagnostic test, meaning it estimates risk rather than confirming a condition.

Why Is the Quadruple Test Important?

The primary goal of the quadruple test for Down syndrome and other conditions is early risk detection. Early identification allows:

• Timely referral for advanced imaging
• Consideration of diagnostic procedures such as amniocentesis
• Structured antenatal planning
• Access to specialised fetal medicine consultation

Detection rates improve significantly when biochemical screening is combined with maternal age assessment and targeted ultrasound. For high-risk pregnancies, such as those in women above 35 years of age or those with a previous history of chromosomal disorders, this screening becomes particularly valuable.

Who Should Consider a Quad Test in Pregnancy?

While the quad test pregnancy screening may be offered routinely, it is especially recommended for:

• Women aged 35 years or older
• Individuals with a family history of chromosomal abnormalities
• Those with abnormal first-trimester screening results
• Previous pregnancies were affected by congenital disorders
• Pregnancies with ultrasound findings suggesting anomalies

Clinical guidelines recommend discussing all prenatal screening options with a qualified obstetrician to determine the most appropriate approach.

Understanding Quadruple Test Normal Values

The interpretation of quadruple test normal values depends on gestational age, maternal age, and laboratory reference standards. Results are typically categorized as:

• Low Risk (Screen Negative): Marker levels fall within the expected range
• High Risk (Screen Positive): Altered marker levels suggest increased probability

For instance:

• High AFP levels may indicate neural tube defects.
• Lower AFP and Estriol with higher hCG and inhibin-A levels may be associated with Down syndrome.

It is important to remember that a “positive” result does not mean the baby has a condition; it simply indicates that further diagnostic testing might be recommended.

Quadruple Marker Test Price in India

The quadruple marker test price can vary depending on laboratory standards, city, and associated services. In India, the cost generally ranges between:

• ₹3,000 to ₹5,600 in many private diagnostic centres
• Some facilities may offer pricing between ₹1,500 and ₹7,500, depending on accreditation and package inclusions

Choosing NABL-accredited laboratories or hospital-based diagnostic services ensures higher reliability and accurate interpretation. Cost considerations should always be weighed alongside quality, clinical expertise, and post-test counselling support.

How is the test performed?

The quadruple marker test in pregnancy is simple and non-invasive:

• A blood sample is drawn from the mother’s arm.
• No fasting is required.
• Results are analysed using biochemical algorithms that factor in maternal age, weight, and gestational age.
• Reports are typically available within a few days.

Because the test only involves maternal blood sampling, it poses no direct risk to the fetus and does not increase miscarriage risk, unlike invasive diagnostic procedures.

Clinical Accuracy and Limitations

While the quadruple marker test improves risk assessment accuracy, it has limitations:

• False positives may occur.
• Detection is not 100%.
• It does not screen for all genetic conditions.

This is why interpretation must be carried out by experienced obstetric specialists who can provide context and guide appropriate next steps.

In structured tertiary-care settings, screening results are reviewed alongside ultrasound findings and patient history to create a comprehensive prenatal care plan.

Conclusion

The quadruple marker test is a clinically validated second-trimester screening tool that helps assess the risk of chromosomal abnormalities and neural tube defects by evaluating four key maternal blood markers. While the quadruple test does not provide a definitive diagnosis, it plays a crucial role in guiding further investigation, structured monitoring, and informed pregnancy management. Understanding the quadruple marker test in pregnancy, interpreting quadruple test normal values, and being aware of factors such as the quadruple marker test price enable families to make timely, well-informed healthcare decisions.

At Sparsh Hospital, prenatal screening is integrated within a comprehensive maternal care framework that emphasises safety, clinical precision, and multidisciplinary collaboration. Recognised as a leading Obstetrics and Gynaecology hospital in Bangalore, Sparsh Hospital provides evidence-based pregnancy care under the guidance of some of the Best Gynecologists in Bangalore, ensuring structured support throughout every stage of pregnancy.

Frequently Asked Questions

1) What is a quadruple marker test in pregnancy?

It is a second-trimester blood screening that measures four markers to assess the risk of chromosomal abnormalities and neural tube defects.

2) How accurate is the quadruple test for Down syndrome?

The quadruple test detects up to 80% of Down syndrome cases when combined with maternal age and ultrasound findings.

3) What are the normal values in a quadruple marker test?

Normal values vary by gestational age; results are reported as low-risk or high-risk based on biochemical marker patterns.

4) Is the quad test pregnancy screening mandatory?

It is not mandatory but strongly recommended for structured second-trimester risk assessment, especially in high-risk pregnancies.

5) What happens if the quadruple marker test shows high risk?

A high-risk result suggests increased probability; further evaluation, such as a detailed ultrasound or anomaly scan, may be advised.