It is possible for a genetic counsellor to gauge what the inheritance pattern is just by asking about your present and past family members to see if there were other cases. It is important to note that most chromosome abnormalities occur as a accident in the egg or sperm. In this case the fertilised egg or sperm multiplies and therefore every cell in the body has the abnormality. Genetic Testing Testing for a particular condition will first start with a clinical assessment to try to ascertain what the suspected condition or the range of conditions might be. An MRI or CT scan will be used to help provide the clues to what to do next.
Genetic testing is a broad and complex field.
This sort of test is usually carried out on suspected Miller-Dieker Syndrome cases. This type of test can only be used to check a suspected region of chromosome, it can't check every chromosome. This sort of test is usually carried out on Miller-Dieker Syndrome cases that appear to have a normal Karyotype and in cases of Isolated Lissencephaly Sequence. DNA Sequencing - a very specialised test that looks at the smallest detail of a targeted gene. This type of test is applied when the FISH test is unable to find an abnormality in ILS cases.