SUMMARy Anemia is one of the most commonly encountered abnormal laboratory findings in intensive care unit (ICU) patients, and many ICU patients will receive a blood transfusion during their ICU stay. However, the determinants of when and to whom transfusions should be given are not clear cut and have been the subject of considerable debate in recent years. Transfusion practice may vary considerably between institutions and across countries. The ABC (anemia and blood transfusion in critical care) study reported increased ICU and hospital mortality rates in patients who had received a transfusion. On the other hand, low hemoglobin levels are still associated with increased mortality and morbidity. The “traditional” transfusion trigger of 10 g/dL certainly no longer applies to all, but may well be relevant in certain groups, e.g., patients with cardiac disease. Transfusions should certainly be more restrictive than before, but applying this policy across the board cannot be recommended; each patient must be assessed individually on the basis of past and present clinical history, and in light of oxygenation and hemodynamic parameters. Clearly, further study is needed before we are able to determine the best transfusion strategies for our ICU patients.
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