She has worked in the Genetics Department at Great Ormond Street Hospital since 1992.
Dr Barnicoat works in general genetics. She runs outreach clinics at Basildon Hospital and the North Middlesex Hospital. She also works as part of Great Ormond Street Hospital Disorders of Sexual Development team. She runs a joint clinic with the Paediatric Renal team at Great Ormond Street. She has a long standing interest in Fragile X syndrome.