These tests describe the protein part of your liver profile
Total protein, albumin, globulin and the albumin/globulin ratio are often reported together in a liver profile. They can give useful clues about liver production, immune activity, inflammation, nutrition and protein loss.
They do not diagnose a condition by themselves. Doctors look at the pattern, your symptoms, examination findings and other tests before deciding what the result means.
What are total protein, albumin, globulin and A/G ratio?
Total protein is the combined amount of the two main protein groups measured in blood: albumin and globulin. The A/G ratio compares how much albumin there is compared with globulin.
This simple relationship is important because a normal total protein may still hide a low albumin, high globulin or abnormal A/G ratio.
What is total protein?
Total protein measures the major proteins circulating in your blood. These proteins help transport substances, maintain fluid balance and support immune function.
Because total protein combines albumin and globulin, doctors usually look at the separate albumin and globulin values as well, not only the total number.
What is albumin?
Albumin is the most abundant protein in the blood. It is produced mainly by the liver and helps keep fluid inside blood vessels, a function called oncotic pressure.
Albumin also transports substances such as hormones, bilirubin, medicines, calcium and fatty acids through the bloodstream.
Common causes of low albumin
- Cirrhosis
- Chronic liver disease
- Nephrotic syndrome or kidney protein loss
- Malnutrition or poor protein intake
- Severe illness, inflammation or infection
What is globulin?
Globulin is a group of proteins that includes antibodies and several transport proteins. Many globulins are linked to immune system activity.
Globulin may increase when the immune system is chronically active, and it may fall when proteins are lost or the immune system is not producing enough antibodies.
Causes of high globulin
- Chronic infections
- Autoimmune disease
- Chronic liver disease
- Plasma cell disorders
Causes of low globulin
- Protein loss
- Immune deficiency
- Malnutrition
What is the albumin/globulin ratio?
The albumin/globulin ratio, often written as the A/G ratio, compares the albumin level with the globulin level.
The A/G ratio can change because albumin is low, globulin is high, or both are happening at the same time.
What causes a low A/G ratio?
A low A/G ratio usually means albumin is reduced, globulin is increased, or both. This pattern may be seen with chronic liver disease, chronic inflammation and autoimmune disease.
For example, advanced liver disease can reduce albumin production, while chronic inflammation may increase globulin levels.
What causes a high A/G ratio?
A high A/G ratio is less common. It is usually related to reduced globulin production and may be seen in some immune deficiencies.
Doctors interpret a high ratio together with the actual albumin and globulin values, not as a standalone diagnosis.
Common patterns and possible interpretation
| Finding | Possible Interpretation |
|---|---|
| Low Albumin | Reduced production or protein loss |
| High Globulin | Chronic inflammation or immune activation |
| Low A/G Ratio | Albumin low and/or globulin high |
| High A/G Ratio | Usually low globulin |
How does liver disease affect these tests?
Early liver disease
Albumin often remains normal in early liver disease. This is why a normal albumin result does not always rule out liver disease.
Advanced liver disease
In more advanced liver disease, albumin may fall because the liver's protein-producing ability is reduced. Globulin may rise due to chronic inflammation or immune activation, and the A/G ratio may fall.
Can these tests diagnose liver disease?
No. Total protein, albumin, globulin and A/G ratio cannot diagnose liver disease by themselves.
They should be interpreted together with symptoms, examination findings, AST, ALT, bilirubin, ALP, GGT and imaging such as ultrasound when needed.
Important related liver profile guides
Frequently asked questions
Related articles
The pattern matters more than one number
Total protein, albumin, globulin and A/G ratio are helpful parts of a liver profile, but they are not final diagnoses. A low albumin, high globulin or abnormal A/G ratio should be understood in context.
If your report shows abnormal protein results, discuss the full liver profile with your doctor so the next step is based on the complete picture.