Diagnosis of Creatine Metabolism Disorders by Determining Creatine and Guanidinoacetate in Plasma and Urine
2010
: Creatine metabolism disorders include a creatine transporter deficiency, as well as, deficiencies of two enzymes involved in creatine synthesis, arginine-glycine amidinotransferase (AGAT) and guanidinoacetate methyltransferase (GAMT). Laboratory diagnosis of these disorders relies on the determination of creatine and guanidinoacetate in both plasma and urine. Here we describe a rapid HPLC/MS/MS method for these measurements using a normal phase HILIC column after analyte derivatization.
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