Hemoglobin levels are reported in which units?

• A. mg/dl
• B. g/dl
• C. g/L
• D. mmol/L

Answer: (B)

Hemoglobin levels are reported as grams per deciliter (g/dL) because this unit directly conveys how much Hb is present in a specific volume of blood. In practice, the typical range is about 12–17 g per 100 mL, so writing 12–17 g/dL gives a quick, clinically intuitive sense of normalcy. Using milligrams per deciliter would produce awkwardly large numbers with little clinical convenience, and while some regions report Hb in grams per liter, the usual nursing and US-based standard is g/dL for straightforward interpretation and easy comparison with reference ranges. Reporting in SI units like mmol/L is possible, but it’s less intuitive for bedside assessment since it requires converting grams and taking into account Hb’s molecular weight. Thus, g/dL remains the most practical and widely used format.