What do they involve?

These are diagnostic tests that are performed to examine the chromosomes of the baby. The principal concern for most women undergoing these tests is the potential risk of miscarriage, which is approximately 0.5 – 1% for the following procedures.

There are two types of invasive test which can be carried out.

Chorionic Villus Sampling (CVS)

Chorionic Villus Sampling (CVS) is a test to see if your pregnancy has any genetic abnormalities. Specifically, this test is used to determine if your unborn child has abnormalities such as Down syndrome or Cystic Fibrosis.

This is performed from 11 weeks gestation and involves the removal of a small sample of placental tissue. Local anesthetic is injected to numb the skin and a fine needle is inserted through the abdomen into the placenta. An ultrasound scan is performed throughout the procedure to guide the needle accurately and check the baby’s heart rate. The potential risk of miscarriage is approximately 1%.


A prenatal diagnostic test is used to test chromosomal abnormalities such as Down syndrome.

This is performed from 15 weeks. A fine needle is passed through the abdomen and amniotic fluid removed from around the baby. Again an ultrasound scan is performed to guide the needle accurately. The potential risk of miscarriage is approximately 0.5%.


The results of these types of invasive testing check the chromosomes of your baby. The most common chromosomal abnormality excluded by invasive testing is Down’s Syndrome (Trisomy 21).

These tests will tell us the gender of your baby.

The results are available in 2 stages. The preliminary result is available after 48 hours and the final result after 10 – 14 days. We will contact you with these results and send a copy to your referring doctor. In the event that the result is not normal you will be fully counselled as to the implications and a referral to other clinicians. Throughout the whole process we will liaise closely with your Obstetrician or GP.

OMNI Ultrasound & Gynaecological Care

Condous performs Advanced Endosurgery procedures for women needing intervention for pelvic masses, adnexal pathology, severe endometriosis or hysterectomy. He also runs ‘Hands on’ Live Sheep Laparoscopic Workshops for gynaecologists at Camden Veterinarian School.
Having completed an undergraduate degree with the University of Adelaide, he left Australia in 1993 and moved to London where he completed his training in Obstetrics and Gynaecology. From 2001 to 2003 Condous worked as a Senior Research Fellow at St George’s Hospital, London. At St George’s he set up the Acute Gynaecology Unit, the first in the United Kingdom. It was also during this time that he developed an interest in Early Pregnancy and especially the management of pregnancies of unknown location (PULs). Condous has developed many mathematical models for the prediction of outcome of PULs which have been featured in numerous peer review journals. In 2005, he returned to Australia where he completed his Laparoscopic Fellowship at the Centre for Advanced Reproductive Endosurgery, Royal North Shore, Sydney.

Condous was appointed as a Consultant Gynaecologist and Senior Lecturer at Nepean Hospital in 2006 and soon was made Associate Professor. In 2010, he was made Departmental Head of Obstetrics and Gynaecology at Nepean Hospital. He obtained the MRCOG in 1999 and was made FRANZCOG in 2005. In 2009, he was awarded his Doctorate in Medicine (MD), University of London, for his thesis entitled: “The management of pregnancies of unknown location and the development of new mathematical models to predict outcome”.

Condous has edited three books including the “Handbook of Early Pregnancy Care”, published over 100 papers in international journals and is internationally renowned for his work in Early Pregnancy. He is the Associate Editor for Gynaecologic Obstetric Investigation, which is a European based journal, as well as the Australasian Journal of Ultrasound in Medicine (AJUM). He is on the organising committee and is an invited speaker at the International Society of Ultrasound in Obstetrics and Gynaecology (ISUOG) Scientific meeting in Sydney 2013. His current research interests relate to the management of ectopic pregnancy, 1st trimester growth, PULs and miscarriage and the use of transvaginal ultrasound (in particular sonovaginography, to predict posterior compartment deep infiltrating rectovaginal endometriosis).Condous is also actively involved with post-graduate education including the annual running of the Early Pregnancy and Gynaecological Ultrasound Interactive Courses for Sonologists, Radiologists, Sonographers and Gynaecologists in Australia.