HOW FAR ALONG ARE YOU?

Obtain the most accurate dating of your pregnancy with an early pregnancy ultrasound

OMNI will accurately date your pregnancy (check your gestational age) and confirm your estimated date of delivery (EDD). Gestational age is usually considered to be the age of an embryo or foetus from the first day of the woman’s last menstrual period (LMP) to the current date. A transvaginal ultrasound in early pregnancy can accurately calculate how pregnant the woman is and in turn determine the EDD. During the early pregnancy scan, several measurements are taken including the crown rump length (CRL) and the fetal heart rate. The CRL is the distance from the top of baby’s head to the bottom of the spine. Based on this measurement, we can calculate the age of the pregnancy.

Determination of gestational age is important, because it provides valuable information for your Obstetrician regarding expected or potential problems and directly affects the medical treatment plan for the baby. In about 20% of all women who have an early pregnancy scan, prediction of the time of delivery is altered according to the ultrasound examination. Ultrasound is a better predictor of the time of delivery than the LMP.

The gestational age should not be confused with the fertilisation age of an embryo or fetus; the fertilisation age is always counted from fertilisation, and the gestational age is usually greater by about two weeks. The gestational age of children conceived by in vitro fertilisation (IVF) is known to the hour.

Are you having twins?

OMNI will confirm or exclude the presence of twins using high resolution ultrasound evaluation of the pregnancy. Multiple births include twins and higher order multiples (e.g. triplets, quadruplets). An early pregnancy scan can determine the number of fetuses (singleton or multiple) present.

The prevalence of multiple births has been increasing because of more widespread use of assisted reproductive technologies (ARTs) to treat infertility. The use of fertility drugs such as clompihene and other ARTS such as IVF or GIFT has contributed to the increasing number of higher order pregnancies.

Having diagnosed a twin pregnancy at the 1st trimester scan, it is important to determine if the fetuses have separate placentas or share the same placenta. This is referred to as the chorionicity and ultrasound gives us the answer. If the fetuses have separate placentas, then this is known as dichorionic (DC) twins. If however the babies share the same placenta, then this is known as monochorionic (MC) twins.

Why is it important to determine the number of placentas or chorionicity? Twin to Twin Transfusion Syndrome (TTTS) occurs in twins that share the same placenta (MC twins) and not in DC twins. TTTS is a condition in pregnancy that exists when blood passes disproportionately between twins with a shared placenta. This causes one twin to receive less than normal amounts of blood supply during pregnancy while the other receives too much. There are degrees to the severity of the syndrome, and it can be life-threatening due to the fact that it can worsen at any time during pregnancy. Therefore it is important to distinguish between MC and DC twins in the first trimester at an early ultrasound examination. The earlier the scan is performed in pregnancy, the easier this can be achieved. Once the chorionicity is known, then your Obstetrician can plan your pregnancy, frequency of interval scans and follow up accordingly.

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.