At a glance
A safe, non-invasive test that measures fetal cells present in the mother's blood to produce a 99% accurate Down Syndrome screening result and fetal sex (if requested).
Available from 10 weeks gestation, simply attend our centre for an accurate dating scan, provide a small blood sample and receive your result in under 15 days.
The Harmony Prenatal Test is an advanced yet simple screening test to detect for Down Syndrome in an unborn baby.
- 99% accurate detection rate for 3 most common anomalies and fetal sex (if requested)
- Completely safe and non-invasive
- No GP referral required
- Supersedes the nuchal, quadruple or integrated test
- Useful to obtain a more accurate second opinion after a non-reassuring or a missed 12 week screening
- Service performed by a highly qualified sonographer or consultant
- Appointments available at short notice
- Convenient central London location
You will receive
- Results in 15 days
- Two-page clinical report on your baby, plus screening results from laboratory including fetal sex (if requested)
- Complimentary black and white picture (normally £2.50)
What happens with your results?
We will call you no more than 15 days after your appointment to let you know your results and will send a report detailing your estimated risk and fetal sex (if requested).
What the Harmony prenatal test?
The Harmony prenatal test is simply a non-invasive blood test that provides advanced screening for Down Syndrome.
It can be performed from as early as 10 weeks and exceeds the screening accuracy of the 12 week nuchal scan but does not replace the actual ultrasound scan component of that service which should still be performed at around 12 weeks gestation.
The test is 100% non invasive and cannot harm you nor your baby.
If you have already had either the nuchal scan or integrated test and have received a high risk result you may consider this test to obtain a more accurate second opinion. However Harmony prenatal test is not 100% accurate nor diagnostic so we always recommend that you consider a diagnostic DNA test like a CVS or amniocentesis rather than having another screening test.
How does the Harmony prenatal test work?
Non-invasive prenatal testing analyses microscopic traces of DNA from the unborn baby that circulate in a pregnant mother’s blood.
The test screens for the three most common birth defects caused by chromosomal abnormality:
A scan is performed to accurately date your pregnancy. For this test we cannot use any dating information from any previous scans that you may have had with this pregnancy - unless you have been scanned at our centre.
We ask you detailed questions about yourself and your pregnancy to assist with the screening test and request your signature on two consent forms.
A blood sample is taken and priority dispatched to a laboratory in the USA for analysis
We will call you with your results in under 15 days and will also email you a copy of the report.
What detail is in the reports?
Our scan report will:
- Check the viability of your pregnancy
- Establish the gestational age via a series of measurements
- Confirm the number of babies
The laboratory report will show a result, risk score and recommendation for the three common chromosomal abnormalities:
A high risk indication will be given where the result of your non-invasive prenatal test has fallen below the 1/100 threshold. If your result is 1/100 or higher risk you will be offered an invasive diagnostic test, such as a CVS or amniocentesis to give you a definite answer.
Fetal sex can also be reported at no extra charge (if requested).
How accurate is the Harmony prenatal test?
Verified clinical data from the genetics laboratory:
- Down Syndrome >99% (0.1% false positive rate)
- Edwards Syndrome >97% (0.1% false positive rate)
- Patau Syndrome 80% (0.1% false positive rate)
Detection and false positive rates are calculated on a risk cut-off of 1/100.
Fetal sex reporting (detection of the Y chromosome) has an accuracy of greater than 99%.
Does the Harmony prenatal test replace my 12 week nuchal scan or a CVS/amniocentesis?
No. If you have the test before 12 weeks gestation you will still need to have a scan at 12 weeks to check on your baby's anatomy.
Is the Harmony prenatal test suitable for multiple or IVF pregnancies?
The Harmony prenatal test is suitable for naturally conceived twins. It can also be used on single IVF pregnancies including those using donor eggs.
Is the Harmony prenatal test always successful?
97+% of the time yes.
However please note that the result from every sample is subjected to a large volume of quality control checks. 3% or less will not pass this stage and in this case no result will be issued.
In this event the laboratory will repeat the analysis free of charge but there will be a delay in the result being issued.
In the unlikely event of a second failure we offer a repeat blood test at no additional charge.