What your albumin/globulin (A/G) ratio means

Lab marker guide · Updated July 2026

Understanding lab results

What the A/G ratio measures

Your blood carries two broad groups of protein: albumin — the single most abundant, made by the liver — and globulins, a mix of antibodies and various carrier, clotting, and transport proteins. The A/G ratio simply divides one by the other. Because the two groups shift for different reasons, their balance is a useful pointer: is a change in total protein coming from the albumin side (often the liver or kidneys) or the globulin side (often the immune system or inflammation)?

Labs rarely measure globulin directly — they calculate it as total protein minus albumin — so the A/G ratio comes automatically with a standard panel. Like other derived values, it's nonspecific: a starting clue, read with the actual albumin and total protein.

Typical range

A common reference is:

• ~1.1 to 2.5

Labs vary, so read your result against the range printed on your own report.

What a low A/G ratio means

A low ratio means globulins are high relative to albumin. That can happen three ways — globulins up, albumin down, or both:

• Chronic inflammation or infection — raises globulins (antibodies and inflammatory proteins).
• Liver disease — the liver makes less albumin.
• Kidney conditions — albumin can be lost in the urine.
• Less commonly, conditions that raise antibody proteins, which is why an unexplained, clearly low ratio is sometimes followed up with protein electrophoresis.

A mildly low ratio is common and nonspecific; a clearly low or persistent one is what prompts a closer look.

What a high A/G ratio means

A high ratio (albumin high relative to globulin) is less common and usually less concerning:

• Low globulins — some immune or genetic conditions.
• Dehydration — concentrating the blood can nudge it up.

How it's read alongside the rest

The A/G ratio only means something next to total protein and albumin. A low ratio with a high total protein points toward the globulin side (inflammation/immune); a low ratio with a low albumin points toward the liver or kidneys. For the albumin side of the picture, see albumin and ALP on the metabolic panel.

Why the trend and context matter

A single A/G ratio is a snapshot, and it's the pattern that carries meaning — which protein is driving it, whether it's stable or drifting, and what your other results show. A mildly low ratio that holds steady is very different from one falling alongside a rising globulin. Read over time and in context, it helps separate an incidental finding from one worth investigating.

When to talk to a doctor

A mildly abnormal A/G ratio on its own is common and usually not urgent. It's worth a clinician's interpretation when it's clearly low or high, persists across repeat tests, or appears with an unexplained high globulin, low albumin, or symptoms. Follow-up tests like protein electrophoresis are guided by the context. As always, the ratio is read alongside your other results — not on its own.

For more on making sense of your panels, see how to read your blood test results and browse the rest of the Quanome blog.

Frequently asked questions

What is a normal albumin/globulin ratio?

A common reference is roughly 1.1 to 2.5, though labs vary. The A/G ratio compares albumin (the main blood protein, made by the liver) to globulins (a mix of antibodies and other proteins). Because it's derived from total protein and albumin, it's a clue read alongside those values rather than a diagnosis on its own.

What does a low A/G ratio mean?

A low A/G ratio means globulins are high relative to albumin — either because globulins are up, albumin is down, or both. Common reasons include chronic inflammation or infection (which raises globulins), liver disease (less albumin made), kidney conditions (albumin lost in urine), and, less commonly, conditions that raise antibody proteins. It's a prompt to look further with your clinician, not a diagnosis by itself.

What does a high A/G ratio mean?

A high ratio (albumin high relative to globulin) is less common and usually less concerning. It can reflect low globulins — for example some immune or genetic conditions — or simply dehydration concentrating albumin. Like a low ratio, it's interpreted in context with total protein, albumin, and your history.

What is globulin, and how is it measured?

Globulins are a group of blood proteins that includes antibodies (immunoglobulins) and various carrier and clotting proteins. Labs usually don't measure globulin directly — they calculate it by subtracting albumin from total protein. That's why the A/G ratio comes 'free' with a standard metabolic panel.

Is a low A/G ratio something to worry about?

On its own, a mildly low A/G ratio is a common, nonspecific finding and not a diagnosis. It becomes more meaningful when it's clearly low, persistent, or paired with other abnormalities — an unexplained high globulin, low albumin, or symptoms — which a clinician follows up with tests like protein electrophoresis. The ratio points to a question; the context answers it.