An 86-year-old woman underwent hysterectomy for endometrial adenocarcinoma. A blood sample for routine laboratory testing was drawn into a lithium heparin tube 1.5 h after surgery. After centrifugation, the plasma sample appeared green in color (Fig. 1). The patient had no specific diet or medications that might have accounted for the color change.
- What caused this change in plasma color?
- What other conditions could cause blood discoloration?
- Are there any safety concerns or possible interference with laboratory tests?
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