Which symptom is most likely with a reduced hemoglobin level of 100 mmol/L?

Which symptom is most likely with a reduced hemoglobin level of 100 mmol/L?

• A. Headache
• B. Fatigue
• C. Bradycardia
• D. Yellow sclera

Answer: (B)

Low hemoglobin means tissues aren’t getting enough oxygen, so the most common and noticeable effect is fatigue, especially with activity. The body’s oxygen delivery is impaired, so energy levels drop and people feel tired more easily. Headache can happen if brain oxygen delivery is reduced, but it’s less specific to low hemoglobin than fatigue. Bradycardia would oppose the usual compensatory response to anemia—typically the heart rate speeds up (tachycardia) to try to improve oxygen delivery. Yellow sclera signals jaundice, which suggests bilirubin buildup from red blood cell breakdown or liver issues rather than a direct, everyday symptom of reduced hemoglobin. So fatigue best fits the scenario of lowered oxygen-carrying capacity.

Low hemoglobin means tissues aren’t getting enough oxygen, so the most common and noticeable effect is fatigue, especially with activity. The body’s oxygen delivery is impaired, so energy levels drop and people feel tired more easily.

Headache can happen if brain oxygen delivery is reduced, but it’s less specific to low hemoglobin than fatigue. Bradycardia would oppose the usual compensatory response to anemia—typically the heart rate speeds up (tachycardia) to try to improve oxygen delivery. Yellow sclera signals jaundice, which suggests bilirubin buildup from red blood cell breakdown or liver issues rather than a direct, everyday symptom of reduced hemoglobin. So fatigue best fits the scenario of lowered oxygen-carrying capacity.