In some cases, genome tests provide reliable and accurate information, but in other cases it may not be possible to obtain a definitive result.
An individual is more than the sum of his or her genes. The environment can influence the effect of genes and many health factors are not related to genes at all.
The discovery of a variation in a particular gene may provide some information about the nature of a condition that the person has, will develop or for which they may be at increased risk, but can rarely predict the severity of the condition or the age at which symptoms will onset.
This lack of precision of the information in the genes and how and when these may impact on a person’s health can make it very difficult to decide how to use the information. Genetic counselling is therefore essential to ensure that any decisions made are as informed as possible.
Source: Health - Centre for Genetic Education, Australia