Acylcarnitine Abnormalities – (Organic Acidemias and Fatty Acid Oxidation Disorders)
Decreased C0: Carnitine Uptake Deficiency
ACMG ACT sheet
Elevated C0/C16+C18: CPT1 deficiency
ACMG ACT sheet
Elevated C3: Methylmalonic acidemia, Propionic acidemia, Cobalamin defects
Note: False positives are common, particularly in babies with significant hyperbilirubinemia
Elevated C3DC: Malonic acidemia
Elevated C4: Short chain acyl-CoA dehydrogenase deficiency (SCADD)
Elevated C5: Isovaleric acidemia, Short/branched chain acyl-CoA dehydrogenase deficiency
Elevated C5DC: Glutaric Acidemia 1
Elevated C5OH: 3-MCC deficiency (most common)
Elevated C4OH: Medium/Short Chain Acyl-CoA Dehydrogenase (M/SCHAD) Deficiency:
Elevated C8; C6,C10: Medium-Chain Acyl-CoA Dehydrogenase Deficiency (MCADD):
Elevated C14:1: VLCAD
Elevated C16 and/or C18:1: CPT2, CACT
Elevated C16-OH +/- C18:1-OH: LCHAD, TFP
04/2019