How long does the test take?
This depends on the tissue or sample being tested and the need to culture cells for anlaysis. For prenatal samples such as chorionic villus or amniotic fluid the results are usually available in 1 - 2 weeks. It takes on average between 7-10days to culture sufficient cells from chorionic villus and amniotic fluid. For other pregnancy or miscarriage tissues it can take up to 4 weeks for the test to be complete. For blood chromosome testing it can take up to 18 days to obtain a result.

What if my prenatal test takes longer than 2 weeks?
This happens very occasionally. The main reason is that the cells are taking a bit longer to grow in culture. Just like we all show differences in our height or weight, cells can also differ in how quickly they grow. Other times we do not get enough cells to look at initially and we need to grow more. The extra culture time does not mean that there will necessarily be a problem with your result.

What if the test is abnormal?
Your doctor will contact you to discuss the result, who will be able to explain to you what the abnormality means and arrange genetic counselling for you if needed. If it is a prenatal test you may wish to consider termination of pregnancy or find out more information on how to care for a baby with special needs.

What if I am worried about how my test is going?
Most patients find it difficult waiting for the result of the chromosome test. We understand that you may be anxious about your result, particularly if it is a prenatal test. We understand that it is even harder when your doctor has found a problem with your baby on ultrasound. Sydney Genetics welcomes you to make contact if you are concerned about your test. However, until we have grown your baby's cells, prepared the chromosomes and examined them down the microscope, we will not be able to tell you how long your test will take to complete. Please feel free to contact the laboratory on (02) 9229 6444.

Is the result always correct?
In almost all cases the result is correct. However, for most scientific and medical tests there is a small risk of an abnormal result when there is not really an abnormality (false positive). There is also a small risk of getting a normal result when there is really an abnormality (false negative). From published studies and our own experience, we know that the chance of a false result is less than 1 in 4,000.

What if the test fails and there is no result?
It is extremely rare for a test to fail at Sydney Genetics. The chance of this happening in our laboratory is less than 1 in 1,000. We would usually be able to advise your doctor about two weeks after taking the sample if you need to have the test repeated.