Free Albumin Globulin Ratio Calculator

Understanding the Albumin‑Globulin Ratio

The albumin‑globulin ratio (A/G ratio) is a straightforward metric derived from a routine blood test. It compares the concentrations of two key protein families in your blood—albumin and globulin—providing insight into your liver and kidney function, immune status, and overall nutritional health. This A/G ratio calculator allows you to compute the ratio quickly using your own lab values, making it easier to track changes over time. However, remember that the tool is meant for educational support and should never replace a clinical evaluation by a healthcare professional.

What Are Albumin and Globulin?

• Albumin represents the most abundant protein in human plasma. It helps maintain osmotic pressure, transports hormones and drugs, and buffers pH. The typical reference range for albumin is 3.5–5.2 g/dL.
• Globulins comprise a diverse group of proteins, including immunoglobulins (antibodies) and enzymes, produced mainly by the liver and the immune system. Their normal range is generally 2.6–3.5 g/dL.

The relationship between these two proteins is expressed as the A/G ratio, which can signal shifts in protein production or loss.

How the A/G Ratio Is Calculated

The calculation uses your total protein and albumin levels, both measured in grams per deciliter (g/dL):

$$\text{A/G Ratio} = \dfrac{\text{Albumin}}{\text{Total Protein} - \text{Albumin}}$$

For example, if your albumin is 4.0 g/dL and total protein is 7.0 g/dL, subtract the albumin from total protein (3.0 g/dL) and then divide albumin by that difference. The result is approximately 1.33. You can also enter these numbers directly into the albumin globulin ratio calculator and get an instant answer.

What Is a Normal A/G Ratio?

Reference ranges for the albumin‑globulin ratio vary among laboratories. Commonly cited intervals include:

• 1.2 – 2.2
• 1.5 – 2.5
• 0.5 – 1.2
• 1.1 – 2.5

In general, an A/G ratio of 1.0 or lower is considered low, while values above 2.5 are regarded as elevated. Because reference ranges differ, always check the specific cut‑offs provided by your testing lab.

High A/G Ratio – What It May Suggest

An elevated A/G ratio means that albumin is relatively high compared to globulin. Potential underlying causes include:

• Dehydration (concentrates albumin)
• Leukemia or other disorders that impair globulin production
• Immunodeficiency states, such as HIV or certain genetic conditions
• Side effects of certain medications

A single high result does not confirm a diagnosis; it must be interpreted alongside symptoms, physical exam, and other test results.

Low A/G Ratio – Possible Explanations

A decreased A/G ratio (low albumin, high globulin) can be linked to:

• Chronic inflammation or infection (the body produces more globulins)
• Liver disease (reduced albumin synthesis)
• Kidney disease, particularly nephrotic syndrome (albumin lost in urine)
• Autoimmune disorders (excess antibody production)
• Multiple myeloma (overproduction of immunoglobulins)
• Malnutrition or protein‑losing enteropathies

Again, a low ratio is a clue, not a final answer. Your doctor will consider the whole clinical picture.

Important Note

This albumin globulin ratio calculator is designed as a reference tool to help you understand your lab results. It is not a diagnostic instrument. Always discuss your A/G ratio and any related concerns with a qualified medical professional.