Which term describes a blue discoloration of tissues due to lack of oxygen?

Which term describes a blue discoloration of tissues due to lack of oxygen?

• A. Jaundice
• B. Erythema
• C. Pallor
• D. Cyanosis

Answer: (D)

Blue discoloration of tissues occurs when there isn’t enough oxygen in the blood, so hemoglobin carries less oxygen and appears deoxygenated. This change shows up most clearly in areas with thin skin or good visibility of blood flow, like the lips, tongue, and nail beds. It’s a sign to assess oxygenation and respiratory or circulatory status and act quickly if needed. This is different from jaundice, which is a yellow coloring from bilirubin buildup; erythema, which is a red flush from increased blood flow or inflammation; and pallor, which is a pale color from reduced blood flow or anemia. Cyanosis can be central (involving blood from the heart and lungs) or peripheral (due to reduced blood flow to the extremities).

Blue discoloration of tissues occurs when there isn’t enough oxygen in the blood, so hemoglobin carries less oxygen and appears deoxygenated. This change shows up most clearly in areas with thin skin or good visibility of blood flow, like the lips, tongue, and nail beds. It’s a sign to assess oxygenation and respiratory or circulatory status and act quickly if needed.

This is different from jaundice, which is a yellow coloring from bilirubin buildup; erythema, which is a red flush from increased blood flow or inflammation; and pallor, which is a pale color from reduced blood flow or anemia. Cyanosis can be central (involving blood from the heart and lungs) or peripheral (due to reduced blood flow to the extremities).