Which term describes bluish skin color due to low oxygen delivery?

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

Answer: (D)

Cyanosis is bluish skin color due to low oxygen delivery. It happens when hemoglobin is carrying less oxygen, increasing deoxygenated hemoglobin in capillaries and giving the skin and mucous membranes a blue tint. Central cyanosis reflects systemic hypoxemia and shows up in areas like the lips, tongue, and buccal mucosa, signaling possible respiratory or cardiac issues. Peripheral cyanosis arises from slowed blood flow or vasoconstriction and may be seen in fingers or toes, often with cold or shock. This color change is distinct from pallor (pale from reduced perfusion or anemia), erythema (red from increased blood flow or inflammation), and jaundice (yellow from bilirubin).