Absence of Amino Acids
| Disease | Amino Acids in Urine | Presence of Abnormal Enzyme |
|---|---|---|
| Argininosuccinic aciduria | Argininosuccinic acid (also citrulline) | Argininosuccinase |
| Cystathioninuria | Cystathionine | Cystathionines |
| Homocystinuria | Homocystine | Cystathionine synthetase |
| Hypophosphatasia | Phosphoethanolamine | Serum alkaline phosphate |