Dr Lachlan is A Consultant Clinical Geneticist at Wessex Clinical Genetics Service at University Hospital Southampton. As a consultant in clinical genetics, she specialises in the genetic diagnosis of congenital malformations, learning difficulties and disorders of sex development, and in the clinical interpretation and significance of genetic test results. She is a member of the Royal College of Paediatrics and Child Health and is a Fellow of the Royal College of Physicians. She is the Rare Disease Medical Lead for the Central and South Genomic Laboratory Hub. She has long term experience of diagnosis and management of patients with PTEN Hamartoma Tumour Syndrome, with her interest originating from the time of her research project as a Registrar, back in 2003, when she travelled around the UK, studying patients and their family members diagnosed with PHTS. She is a founding Trustee and medical advisor for the PTEN-UKI charity and a member of the ClinGen PTEN Expert Panel organized by the ClinGen Hereditary Cancer Clinical Domain Working Group.