For every 100 mL of blood withdrawn for sampling, there is a decrease of 7 g/L in haemoglobin. A reduction in iatrogenic blood loss reduces the risk of anaemia and potentially the need for blood transfusion (NBA 2018). The use of micro-sampling has been shown to significantly reduce the volume of blood loss and has been associated with a significant reduction in blood transfusion (Tinmouth 2008). Implementing strategies to reduce iatrogenic blood loss in an organisation requires strategic planning, communication and implementation with relevant stakeholders such as medical staff, laboratory scientist and nursing staff.
In 2017, Blood Matters undertook a snapshot audit of health service policies and practises that could minimise iatrogenic anaemia associated with blood sampling. This audit builds on the 2017 audit to identify changes in policy and practice, and to assess total blood volume taken from patients for samples (testing & discard).
This audit comprises of two parts:
- Part A: Desktop audit of policy and procedures - Audit questions (PDF/Word)
- Part B: Bedside prospective audit of practice – of all patients in one selected clinical area for one week (7 days):
Further instructions for this audit can be downloaded here. (PDF/Word)
Blood Sampling volume audit 2019