Myopathy dx, preliminary. Musc enzymes tests norml. Fatigued, sore. Doc states myopathy, MD, or MND. See speclst in Dec. Can lab tests lag? Ty

Not Really. Blood test do not diagnose all the Myopathy.You have an appointment with Rhematologist and can wait.You will have a neuromuscular exam and may repeat blood tests and may be other tests as indicated like Imaging of Spine or Brain and/or muscle biopsy and EMG/Nerve Conduction Studies if indicated after takinf detailed history and comprehensive Physical Exam to make Diagnosis and appropriate Treatmen.