Key Takeaways
- The double marker test is a blood test for two pregnancy hormones: free beta-hCG and PAPP-A.
- It is designed to be combined with the NT scan at 11 to 13+6 weeks. Together they form first-trimester combined screening.
- The result is a risk estimate (for example 1 in 2,500), not a diagnosis. A higher-chance result is followed by NIPT or a diagnostic test.
- Combined screening detects around 80-90% of pregnancies with Down syndrome, with about a 5% screen-positive rate.
- At DCDC, the NT scan is from AED 350. Combined first-trimester screening (NT + free beta-hCG + PAPP-A) is available and priced on contact.
The double marker test is a first-trimester blood test that measures two hormones made by the placenta: free beta-hCG and PAPP-A (pregnancy-associated plasma protein A). On its own it says relatively little. Combined with the baby's nuchal translucency measurement from an NT scan and your age, it produces a personalised chance estimate for Down syndrome (trisomy 21) and two rarer chromosomal conditions, trisomy 18 and trisomy 13. This guide explains when the test is done, how to read the result, how it compares with NIPT and what it costs in Dubai.
What does the double marker test measure?
The test uses a standard blood sample from the mother. The laboratory measures:
- Free beta-hCG: a form of the pregnancy hormone hCG. In pregnancies affected by Down syndrome, levels tend to be higher than expected for the gestation.
- PAPP-A: a placental protein. In pregnancies affected by Down syndrome, and in trisomies 18 and 13, levels tend to be lower than expected.
Raw hormone values vary with gestational age, maternal weight, smoking, ethnicity, IVF conception and twin pregnancy. The laboratory therefore converts each value into a MoM (multiple of the median): 1.0 MoM is exactly average for that week of pregnancy. The risk software uses the MoM values, not the raw numbers.
Double marker vs NT scan vs combined screening
In Dubai, the terms are often used loosely. The practical difference is:
| Test | What it includes | When |
|---|---|---|
| Double marker (blood only) | Free beta-hCG + PAPP-A | Usually 10 to 13+6 weeks |
| NT scan (ultrasound only) | Nuchal translucency, crown-rump length, early anatomy | 11+0 to 13+6 weeks |
| First-trimester combined screening | Double marker + NT + maternal age, calculated together | Blood and scan in the same window |
| Triple marker (second trimester) | AFP, hCG and estriol | 15 to 20 weeks, for those who missed first-trimester screening |
| NIPT | Cell-free DNA from the placenta in maternal blood | From 10 weeks |
Common prenatal screening tests and their timing. Your obstetrician confirms which pathway suits you.
The double marker is rarely interpreted without an NT measurement. Combined screening is considerably more accurate than either the blood test or the scan alone, which is why international guidance, including the UK NHS screening programme and ACOG, recommends combining them.
When should the double marker test be done?
First-trimester combined screening is timed to the baby's size on ultrasound. The NT measurement is valid when the crown-rump length is roughly 45 to 84 mm, which corresponds to about 11+2 to 14+1 weeks. The blood sample is usually taken in the same window, and some centres take it from 10 weeks. If you are past 14 weeks, combined screening is no longer possible; your doctor may offer the second-trimester triple or quadruple marker test or NIPT instead.
No fasting is needed for the blood test. Bring your dating scan report if it was done elsewhere, because an accurate gestational age is essential for the calculation.
How to read a double marker test result
The report gives a chance figure for each condition, written as 1 in X. A result of 1 in 5,000 means that among 5,000 pregnancies with the same results, one would be expected to have the condition. The laboratory then classifies the result using a cut-off; many programmes use 1 in 150 at term for Down syndrome, although cut-offs vary.
| Result | What it means | Usual next step |
|---|---|---|
| Lower chance (e.g. 1 in 1,000 or lower) | The chance is below the screening cut-off. It does not rule the condition out completely. | Continue routine care and the anomaly scan at 18-22 weeks |
| Higher chance (e.g. 1 in 50 to 1 in 150) | The chance is above the cut-off. Most pregnancies in this group are still unaffected. | Discuss NIPT or a diagnostic test with your obstetrician |
| Very high chance (e.g. 1 in 2 to 1 in 10) | A stronger signal, sometimes with a raised NT | Diagnostic testing (CVS or amniocentesis) is usually discussed |
Illustrative risk bands. The exact cut-off and wording depend on the laboratory and programme.
Low PAPP-A on its own (for example below 0.4 MoM) is also linked in some studies with placental problems later in pregnancy, such as growth restriction or pre-eclampsia. If your report shows it, your obstetrician may plan extra growth scans. This does not mean a problem will happen.
How accurate is first-trimester combined screening?
Combined screening detects around 80-90% of pregnancies with Down syndrome, with a screen-positive rate of roughly 5%. NIPT detects about 99% of Down syndrome pregnancies with a much lower false-positive rate, but it is also a screening test and a positive NIPT still needs diagnostic confirmation. Our NIPT guide explains its strengths and limits.
Many parents choose one of three pathways: combined screening alone; combined screening, then NIPT only if the chance is higher; or NIPT from 10 weeks plus an NT scan for early anatomy. The NT scan remains useful even if you choose NIPT, because a markedly increased NT can point to heart or other structural problems that NIPT does not assess.
Double marker test price in Dubai and the UAE
Prices vary because some clinics quote the blood test alone and others include the scan, the risk calculation and a consultation. When comparing quotes, check whether the price includes the NT scan, the risk software report and a doctor's explanation.
| Item at DCDC | Price |
|---|---|
| NT scan (nuchal translucency ultrasound) | From AED 350 |
| First-trimester combined screening (NT + free beta-hCG + PAPP-A) | Priced on contact |
| NIPT | See the NIPT service page for current options |
DCDC pricing from the clinic's current service information. Insurance cover for antenatal screening depends on your policy.
Many UAE maternity insurance plans cover routine first-trimester screening, but cover for NIPT varies. Ask your insurer before the appointment and bring your insurance card for direct billing.
What to Expect at DCDC
- Booking: tell the team your last menstrual period or dating scan, so the appointment falls between 11 and 13+6 weeks.
- Ultrasound: the NT scan is usually abdominal and takes about 20-30 minutes. If the baby is not in a good position, you may be asked to walk around and return.
- Blood sample: a routine draw for free beta-hCG and PAPP-A. No fasting is needed.
- Result discussion: your obstetrician explains the chance estimate and, if needed, the options for NIPT or diagnostic testing.
- Location: Building 64, Block A, Al Razi Medical Complex, Dubai Healthcare City, with free parking. Direct billing with 20+ insurers.
Book first-trimester screening at DCDC
NT scan from AED 350, with combined screening (NT + double marker) available. Ask for a quote and the right booking week.
Call +971 54 219 5008 or WhatsApp 971509703884. DCDC is at Building 64, Block A, Al Razi Medical Complex, Dubai Healthcare City, open Saturday to Thursday 8AM-10PM and Friday 9AM-9PM, with free parking.
Related Services at DCDC
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Frequently Asked Questions
A screening result is the start of a conversation
The double marker test is most useful as part of combined screening with an NT scan, booked in the right week. A lower-chance result is reassuring but not a guarantee, and a higher-chance result most often comes from an unaffected pregnancy.
If you are unsure which screening pathway is right for you, discuss it with your obstetrician before 11 weeks so there is time to book the scan, the blood test and, if you want it, NIPT.
Sources & References
This article references the following sources:
- NHS - Screening for Down's syndrome, Edwards' syndrome and Patau's syndrome
- ACOG Practice Bulletin No. 226 - Screening for Fetal Chromosomal Abnormalities (2020)
- The Fetal Medicine Foundation - Assessment of risk for trisomies
- NICE NG201 - Antenatal care (2021)
- MedlinePlus - Prenatal Cell-free DNA Screening
This information is educational and does not replace individual medical advice. See our editorial policy for more information.
Written by
DCDC Editorial Team
Patient education
Patient information from Doctors Clinic Diagnostic Center in Dubai Healthcare City, based on the medical references listed with this article. This guide supports discussion with your clinician and does not provide an individual diagnosis.
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