Mutations could be harmful if they change the codes for protein synthesis in such a way that a particular protein will not be able to conduct its routine function and will cause ailment. However not all mutations are harmful, there are very few number of mutations that actually can change the codes for a better functioning protein. In this case they will be beneficial.
Here we are testing for potentially harmful mutations in human genes. These mutations are present in different populations with different frequencies. Depending on the length and the function of a gene some genes contain just a single mutation and some over 1000 mutations. Obviously identifying a single harmful mutation is an easier task than checking for many more, yet with today’s technology we are able to check for tens of mutations at one shot. Thanks to advanced genetics.
Through genetic testing these harmful mutations will be detected if present and you would be able to either find the appropriate treatment or conduct preventive medicine.