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Coffee brown blood

Coffee brown blood

What causes the blood color to turn coffee brown & black?
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Avatar_dr_m_tn
Hello,
Coffee brown blood can be due to methhemoglobinemia. It is characterized by the presence of a higher than normal level of methemoglobin (metHb) in the blood and hence can cause coffee shade blood. In addition it can cause shortness of breath, cyanosis, mental status changes, headache, fatigue, exercise intolerance, dizziness and loss of consciousness.

If you are talking about coffee colored blood in vomitus then it can be caused by GI or hepatic causes.
I hope it helps. Take care and regards.
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