Cystinuria is a hereditary metabolic disorder in cats in which the kidneys do not function properly. As a result, the amino acid cystine is excreted in increased amounts in the urine. Cystine is poorly soluble in water, so accumulations of this substance in the urine crystallize, forming stones. In this variant, the urinary stones that cause the clinical symptoms occur during adolescence through middle age. This can lead to a life-threatening blockage of the urinary tract. Episodic neurological disorders have also been described.
European Longhair
| Test Number | Included only in LABOGeneticsXXL – Cat |
| Abbreviation | Cys |
| Inheritance Pattern | presumably autosomal recessive |
| Gene | SLC7A9 |
| Mutation | C-T |
| References | OMIA:002023-9685 |