MTHFR<unk>  is diagnosed by genetic testing.
Methylenetetrahydrofolate reductase deficiency
Dihydrofolate reductase deficiency
Adenine phosphoribosyltransferase deficiency
Guanidinoacetate methyltransferase deficiency
5,10-methenyltetrahydrofolate synthetase deficiency
Purine nucleoside phosphorylase deficiency
Dihydropyrimidine dehydrogenase deficiency
Adenosine deaminase 2 deficiency