Albumin

The most important single nutrition marker in oncology.

What it is

Albumin is the most abundant protein in the blood, produced by the liver. It maintains oncotic pressure (keeping fluid in the blood vessels), transports drugs and hormones, and reflects long-term nutritional status — it has a half-life of about 20 days.

Why it matters

Low albumin is one of the strongest prognostic markers in oncology. It reflects protein-energy malnutrition, liver dysfunction, and systemic inflammation. Many drug doses are calculated based on body composition; severe hypoalbuminaemia can affect how drugs distribute and are metabolised. This is one of the most actionable numbers to track and optimise through nutrition.

How to test

Standard metabolic panel.

This information is for educational purposes only. Always discuss testing and interpretation of results with your care team.

Optimal range

Below 35 g/L

hypoalbuminaemia — review nutrition urgently

35–50 g/L

normal range

How often

Every 4–8 weeks during active treatment.