Metals, Joint Fluid (Temporary Referral as of 08/29/16) Methylmalonic Acid (MMA) Quantitative, Urine MITF by Immunohistochemistry Motor Neuropathy Panel Metanephrines Fractionated by HPLC-MS/MS, Urine Methylmalonic Acid, Serum or Plasma (Metabolic Disorders) Mitochondrial Disorders (121 Nuclear Genes by Sequencing, 119 Nuclear Genes by Deletion/Duplication) MPL codon 515 Mutation Detection by Pyrosequencing, Quantitative Metanephrines, Plasma (Free) Methylmalonic Acid, Serum or Plasma (Vitamin B12 Status) Mitochondrial Disorders (121 Nuclear Genes) Sequencing MPO/PR-3 (ANCA) Antibodies Metformin Quantitation, Urine Methylphenidate and Metabolite, Serum or Plasma, Quantitative Mitochondrial Disorders (mtDNA and 119 Nuclear Genes) Deletion/Duplication Muc-1 by Immunohistochemistry Metformin Quantitative, Serum or Plasma Methylphenidate and Metabolite, Urine, Quantitative Mitochondrial Disorders (mtDNA) Sequencing Muc-4 by Immunohistochemistry