Hi Guys, I have a diagnosis of TED and Ptosis however my other symptoms of muscle stiffness is being ignored. I came across a LRP4 antibody test for seronegative MG results which can potentially change a negative result into a positive one. Does anybody know where I could have this test privately done in London? My GP states it's not on the NHS blood testing list. I need the test quickly as I'm now impatient after 6/7 years of Ptosis and without a conclusion!