What is the normal reference range for phosphate in the blood?

What is the normal reference range for phosphate in the blood?

• A. 3.0-5.0
• B. 1.5-2.5
• C. 2.5-4.5
• D. 4.0-6.0

Answer: (C)

Phosphate in the blood is an important contributor to energy metabolism and bone mineralization, and its level is tightly regulated. In adults, the normal serum phosphate range is about 2.5 to 4.5 mg/dL. This range best represents a balanced, healthy phosphate status. Values fall outside this window: below 2.5 mg/dL suggests hypophosphatemia, while above 4.5 mg/dL suggests hyperphosphatemia. Some labs may use slightly different cutoffs or units (mmol/L), but 2.5–4.5 mg/dL is the standard reference for adults.

Phosphate in the blood is an important contributor to energy metabolism and bone mineralization, and its level is tightly regulated. In adults, the normal serum phosphate range is about 2.5 to 4.5 mg/dL. This range best represents a balanced, healthy phosphate status. Values fall outside this window: below 2.5 mg/dL suggests hypophosphatemia, while above 4.5 mg/dL suggests hyperphosphatemia. Some labs may use slightly different cutoffs or units (mmol/L), but 2.5–4.5 mg/dL is the standard reference for adults.