What percentage of total protein in blood is albumin?

Albumin constitutes a significant portion of total protein in the blood, typically accounting for about 60% of the total serum protein. This high percentage is due to albumin's essential roles in maintaining oncotic pressure, transporting various substances (such as hormones, vitamins, and drugs), and acting as a reservoir for proteins.

The values reflected in the other options do not accurately represent the known concentration of albumin in serum. While albumin's exact percentage can vary based on individual health, hydration status, and specific laboratory measurements, it generally hovers around this 60% mark in healthy individuals, which confirms that this choice is the most accurate representation of albumin's contribution to total protein in the blood.