A 46-year-old female patient was electively admitted to our hospital for a sentinel lymph node biopsy, tumorectomy, and mastopexy (breast lift). During surgery, an accidental needle stick injury occurred, and because the patient was the exposure source, screening for blood-transmitted diseases was required. In our laboratory, the sample was centrifuged, and its distinctive appearance surprised us – blood plasma was dark green. Typically, due to several pigments – bilirubin, carotenoids, hemoglobin, and iron transferrin – blood plasma is yellow.

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