were randomly chosen from a non-contaminated group (control group). The median age of our sample was 75 years (interquartile range, 62 to 85 years). In multivariate analysis, patients with higher nursing care level (odds ratio [OR], 5.24; 95% confidence interval [CI], 1.47-18.70) had higher incidences of blood culture contamination. Conclusion: In this retrospective analysis, higher nursing care level is associated with higher incidences of blood culture contamination in the ED. Especially in geriatric medicine, careful procedure is required for patients with higher nursing level to avoid blood culture contamination and achieve accuracy of test result. Nursing care level in Japan Level General Condition 1 Need partial support for daily activity and care. 2 Need support for walking or standing. 3 Add to level2, cognitive dysfunction or problematic behavior. 4 Need help for eating or excretion. 5 Cannot stand up and move by oneself. 6 Cannot excrete by oneself, severe dementia. 7 Cannot eat by oneself.
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