Box 2.

Definition of possible potentially reversible anaemia.

Iron deficiency = Ferritin ≤15 mcg/L (female) or ≤20 mcg/L (male) or if there was no Ferritin result then Iron studies suggestive of TSAT ≤20 or if there was also no TSAT result then TIBC ≥85 μmol/L or if there was also no TIBC result then MCV ≤78 fl
B12 deficiency = B12 ≤150 ng/L (pg/mL)
Folate deficiency = Serum folate ≤2 mcg/L (ng/mL) or if there was no serum folate result then Red cell folate ≤80 mcg/L (ng/mL)
Autoimmune haemolytic anaemia = Direct Antiglobulin Test (DAT) ‘Positive’ or grade 1 and above
Renal Anaemia (definition 1) calculated eGFR of ≤44 (Chronic Kidney Disease stage 3b to 5) but excluding patients with ‘acute renal failure’, ‘blood loss’ and unknown age or gender.
Renal Anaemia (definition 2) calculated eGFR of ≤30 (Chronic Kidney Disease stage 4 to 5) and chronic renal failure as ONLY diagnosis ‘ticked‘
  • Reproduced with permission from the National Comparative Audit of Blood Transfusion.2