Globulin

What is Globulin?

The group of blood proteins other than albumin, often calculated as total protein minus albumin; globulins include antibodies and transport and clotting proteins.

Globulin refers to the diverse family of blood proteins other than albumin, and on many panels it is reported as a calculated value, total protein minus albumin. These proteins include antibodies (immunoglobulins) made by the immune system as well as transport and clotting proteins, some of which are produced by the liver. Because globulin bundles together proteins with very different jobs, a high or low value is a broad signal rather than a specific finding, and it is usually read together with albumin as the albumin/globulin (A/G) ratio. Higher globulin can accompany chronic infection, inflammation, or certain blood conditions, while lower globulin can relate to immune or liver factors. When globulin looks abnormal, clinicians often order protein electrophoresis to separate the individual fractions.

What to know about Globulin

Understanding Globulin means knowing what it reflects, what tends to move it, and the signs that suggest it’s worth a closer look — so you can bring the right questions to your next appointment.

How to read a value in context

A 'normal' globulin means the calculated or measured value is within your lab's reference interval, but because globulin lumps together antibodies, transport, and clotting proteins, a normal number can mask changes within specific fractions. It is a screening-level figure best interpreted with albumin, the A/G ratio, and, when needed, protein electrophoresis rather than on its own.

Lifestyle factors that influence this marker

• Follow a balanced diet that supports general immune and liver health within your clinician's guidance
• Stay appropriately hydrated, since hydration affects measured protein concentrations
• Address ongoing infections or inflammatory conditions with your clinician rather than self-managing
• Talk to your doctor before making significant changes to your diet, exercise, medications, or supplements

Tests often checked alongside this

• Albumin — paired with globulin to calculate the A/G ratio
• Total protein — the sum from which globulin is often derived
• Protein electrophoresis — separates globulin into its individual fractions when abnormal
• ALT and AST — assess liver contribution to protein production

How this can show up in how you look and feel

• Globulin is a blood measurement and does not itself cause symptoms
• High globulin can be associated with chronic infection or inflammatory conditions
• Low globulin is sometimes seen with certain immune or liver-related states
• Changes in globulin are frequently found on routine testing without any symptoms

What can affect this marker

• Immune activity, including chronic infection or inflammation
• Liver production of some globulins
• Hydration status
• Certain blood and immune conditions

What to track over time

• Your globulin trend and the A/G ratio over time
• How globulin moves relative to albumin
• Any chronic infection or inflammatory symptoms
• Results of follow-up tests such as protein electrophoresis

What to ask your doctor

• Is my globulin measured directly or calculated from total protein minus albumin?
• Does my A/G ratio point toward an immune, inflammatory, or liver-related direction?
• Would protein electrophoresis help clarify an abnormal globulin?
• Should this be rechecked, and alongside which tests?

This glossary entry is for informational purposes only and is not a substitute for professional medical advice. Read our Medical Disclaimer.