Diagnosed but negative blood test

[Guest guest]

There is a lingering question mark whether CMT is the right diagnosis although 2

neurologists have given us the diagnosis. Both my husband and son took the blood

test to determine what type of CMT they have and both of their tests came back

negative. However, the neurologist said it doesn't change his diagnosis. My

husband had the electric connectivity test in his nerves and does have very

clear nerve damage although it doesn't affect him symptomatically. We are not

going to give this test to our son because it was SO PAINFUL for my husband (he

needed smelling salts!). Does anyone out there have a CMT diagnosis with

negative blood tests? Thank you!