The CLDN19 gene encodes a constituent of tight junctions. Mutations cause the autosomal recessive disease of renal hypomagnesemia with ocular involvement.
| Clinic | Method | Carrier testing |
| Turnaround | 5 days | |
| Specimen type | genomic DNA |
| Clinic | Method | Massive parallel sequencing |
| Turnaround | 25 days | |
| Specimen type | genomic DNA |
| Clinic | Method | Genomic sequencing of the entire coding region |
| Turnaround | 10 days | |
| Specimen type | genomic DNA |