Thrombotic Thrombocytopenia Purpura (TTP), Atypical Haemolytic Uraemic Syndrome (aHUS) and Thrombotic Microangiopathies (TMAs) 

UCLH provides an integrated specialist service for the diagnosis, treatment and follow up of patients with TTP, aHUS and other TMAs.

These conditions are rare disorders, but we have a dedicated team of medical professionals who have developed patient pathways to maximise response to therapies. We are committed to investing in research to understand these disorders and improve treatments.


Dr Marie Scully, Consultant Haematologist

Dr Marie Scully

Dr Scully was appointed as a consultant at UCLH in 2007, with an interest in haemostasis and thrombosis. She is clinical lead for haematopathology and blood transfusion at UCLH. She is also the lead for TTP and associated TMAs, including aHUS. UCLH is a specialist centre for TTP.

Full consultant profile

Dr Mari Thomas, Consultant Haematologist

Dr Mari Thomas is a new Haematology consultant joining the Thrombosis team at UCLH. She recently completed a PhD at UCL looking into the role of antibodies in TTP. As part of the TTP team, she manages both inpatients and outpatients with TTP and other thrombotic microangiopathies, such as atypical HUS. Her other areas of interest include venous thromboembolism in cancer patients.

Dr Thomas is starting a new clinic for cancer VTE in the UCLH MacMillan Cancer Centre. She also specialises in obstetric haematology, running a joint antenatal clinic for high-risk pregnancies with Dr Cohen and obstetric colleagues. She acts as liaison between the transfusion laboratory and the Fetal Medicine Unit for women with red cell alloantibodies in pregnancy.

"The most rewarding part of my work is working with a great team and seeing our research findings translated into better outcomes for patients."

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Dr John-Paul Westwood, Consultant Haematologist

Dr John-Paul Westwood specialises in Haemostasis and Thrombosis, including Thrombotic Thrombocytopenic Purpura (TTP), Immune Thrombocytopenia (ITP), and bleeding disorders. He also work as a Transfusion consultant. His research intrests are in non-malignant haematology, including TTP and ITP. I am also involved in supporting clinical trials in these disease areas.

“The most rewarding part of my work at UCLH is treating patients with varied and often challenging diseases in the field of haemostasis and thrombosis”

Full consultant profile

 Clinical Nurse Specialists (CNS)