Why should someone have a genetic test?

If a person is known to be MH susceptible and has a DNA change (mutation) known to be causative for MH, then his or her relatives may be diagnosed as MH susceptible through the DNA test. Those in the family with this mutation are therefore MH susceptible and do not need to undergo the muscle biopsy test for confirmation. However, the absence of the mutation does not mean that the patient is not at risk for MH.