It is well recognised that patients with diabetes mellitus have a predisposition towards stenosing flexor tenosynovitis (FTS). However, recent research has suggested an association between the development of FTS and haemoglobin A1c (HbA1c) level which is used as a marker of glycaemic control. National guidelines on management of diabetes suggest treatment should aim to maintain HbA1c at <6.5%. The aim of our study is to quantify glycaemic control in patients undergoing surgical A1 pulley release. We retrospectively reviewed the blood results of 78 patients who underwent FTS surgery. 27 of these had an HbA1c checked within 6 months of their surgery and we therefore presumed these patients were diabetic. For diabetic patients the average HbA1c was 7.9% (range 5.3–11.4) and only 7 of the 27 patients had an HbA1c within the recommended range. In this cohort 33% of patients were presumed diabetic and 74% of these had a documented HbA1c above the national target suggesting a significant number presenting for surgery have poor glycaemic control. Therefore it may be of benefit to screen for this in patients undergoing FTS surgery