Venepuncture-related nerve injury in medico-legal practice

Venepuncture is one of the most common invasive medical procedures and is usually benign, but rare peripheral nerve injuries can create difficult medico-legal questions. This article examines venepuncture-related nerve injury through the practical lens of causation and prognosis. It explains why timing, anatomical plausibility, symptom distribution and clinical evolution are central to determining whether a nerve injury was caused by venepuncture, while emphasising that injury alone does not prove substandard care. The article outlines key nerve injury classification systems, including Seddon, Sunderland and Birch and Bonney, and shows how distinguishing conduction block from degenerative injury informs prognosis. It also considers neuropathic pain, the limited but important role of electrodiagnostic testing and imaging and the need to consider Complex Regional Pain Syndrome in persistent cases. The article argues that accurate medico-legal opinion depends on detailed peripheral nerve examination and, where symptoms persist, assessment by a peripheral nerve injury specialist.