The MLH1 gene was identified as a locus frequently mutated in hereditary nonpolyposis colon cancer (HNPCC).
| Clinic | Method | Carrier testing |
| Turnaround | 5 days | |
| Specimen type | genomic DNA |
| Clinic | Method | Massive parallel sequencing |
| Turnaround | 25 days | |
| Specimen type | genomic DNA |
| Research | Method | Multiplex Ligation-Dependent Probe Amplification |
| Turnaround | 25 days | |
| Specimen type | genomic DNA |