A globulin blood test measures a group of proteins in your blood that help fight infection, carry nutrients, and support clotting. High globulin most often points to inflammation or infection. Low globulin can point to liver disease, kidney disease, malnutrition, or low antibody levels.

The word "globulin" hides a lot. It isn't one protein. It's a crowd of dozens, and the number on your report is only the size of the crowd. Working out who's in it is the real question.

Globulin results at a glance

Reference ranges for calculated globulin vary by lab and commonly sit around 2 to 3.5 g/dL. Use the range printed on your report.

What is globulin on a blood test?

Globulin is the name for every blood protein that isn't albumin. Some globulins are made by the liver and others by the immune system, and MedlinePlus groups them as alpha, beta, and gamma globulins.

On a standard metabolic panel, globulin usually isn't measured directly. The lab measures total protein and albumin, then subtracts. That's why some reports label it "calculated globulin."

The four globulin groups

Gamma globulins make up the largest share, so most big swings in total globulin trace back to antibodies.

What does high globulin mean?

High globulin most often means your immune system is making more antibodies than usual. MedlinePlus lists infection, inflammatory disease, immune disorders, and certain cancers such as multiple myeloma and lymphoma among the causes.

Inflammation, infection, and autoimmune conditions

This is the common explanation by a wide margin. A long-running infection, chronic inflammation, or an autoimmune condition such as lupus or rheumatoid arthritis keeps many different antibody-producing cells busy at once.

"Alpha and gamma globulin protein levels increase when there is inflammation in the body." - Source: MedlinePlus Medical Encyclopedia, Protein electrophoresis - serum

A raised C-reactive protein often travels with it.

Liver disease

Chronic liver conditions can raise gamma globulins while albumin falls. When globulin is high, clinicians check liver enzymes such as ALT alongside it.

A single antibody clone

Less often, one family of antibody-producing cells grows and makes a single identical protein. The most common version is a condition called MGUS (monoclonal gammopathy of undetermined significance), which causes no symptoms and is found in about 3% of people aged 50 and older.

Most people with MGUS never develop a blood cancer. In the same Mayo Clinic study, which followed 1,384 patients for decades, the risk of progression was 10% at 10 years, which works out to roughly 1% a year. That's why the usual plan is monitoring.

A high globulin result can't tell these situations apart. Electrophoresis can.

What does low globulin mean?

Low globulin means your body is making fewer of these proteins or losing them. MedlinePlus lists liver disease, kidney disease, and malnutrition as the main causes.

Damaged kidneys can let protein pass into urine. Gut conditions such as Crohn's disease can reduce absorption or leak protein into the bowel.

Low antibody levels are the cause that gets missed. Researchers in Wales tested whether a low calculated globulin could flag people with antibody deficiency, and the result was hard to ignore.

"89% of 826 blood samples with a low calculated globulin (below 18 g/L, or 1.8 g/dL) also had a low IgG antibody level when tested." - Source: Jolles S et al., Clinical and Experimental Immunology, 2014

That study came from hospital labs, so the share would likely be lower in healthy outpatients. Still, a clearly low globulin in someone with frequent infections is a reason to measure immunoglobulins directly.

What can shift globulin without disease?

Several everyday factors move the number. MedlinePlus notes that certain medicines, dehydration, and pregnancy can cause abnormal results.

Dehydration concentrates every blood protein, so globulin, albumin, and total protein all read a little high together. A repeat test when you're well hydrated settles it.

We'd rather see a mildly abnormal globulin repeated before anyone starts a long workup.

What tests come after an abnormal globulin?

The follow-up depends on which direction the result moved.

1. Read it with albumin and total protein. If all three are high, think dehydration first.
2. Check inflammation and liver markers when globulin is high, including CRP and a white blood cell differential.
3. Order serum protein electrophoresis if globulin stays high. It separates the four groups and shows whether the rise is broad or a single spike.
4. Measure immunoglobulins (IgG, IgA, IgM) and urine protein when globulin is low.

How Parsley clinicians approach globulin

Parsley Health clinicians are board-certified in conventional medicine with advanced training in functional medicine. An abnormal globulin gets the standard workup first, with referral to hematology or immunology when the results call for it.

Parsley clinicians often look at what's driving inflammation, including gut health, infections, and autoimmune activity, since that's where most high results come from.

Frequently asked questions

Is high globulin serious?

Usually it reflects inflammation or a recent infection and isn't serious by itself. It needs follow-up when it's well above the range, keeps rising, or comes with symptoms such as bone pain or weight loss.

Can dehydration cause high globulin?

Yes. Dehydration concentrates blood proteins, which can push globulin, albumin, and total protein slightly above range at the same time. Repeating the test when hydrated usually clears it up.

What's the difference between globulin and immunoglobulin?

Immunoglobulins are antibodies. They're one part of the globulin group, the gamma portion, and the largest one. A globulin result covers antibodies plus transport and inflammation proteins.

Do I need to fast for a globulin blood test?

Not for globulin itself. You may be asked to fast if the same panel includes glucose or cholesterol.

This article is for educational purposes only and isn't a substitute for medical advice, diagnosis, or treatment. Lab results vary from person to person. Talk with a licensed clinician about your own results and symptoms.

References & Sources:

1. MedlinePlus. Globulin test. National Library of Medicine. Updated November 4, 2024. Accessed November 13, 2026. https://medlineplus.gov/lab-tests/globulin-test/
2. MedlinePlus. Total protein and albumin/globulin (A/G) ratio. National Library of Medicine. Updated October 20, 2024. Accessed November 13, 2026. https://medlineplus.gov/lab-tests/total-protein-and-albumin-globulin-a-g-ratio/
3. MedlinePlus Medical Encyclopedia. Protein electrophoresis - serum. National Library of Medicine. Reviewed January 29, 2026. Accessed November 13, 2026. https://medlineplus.gov/ency/article/003540.htm
4. Kyle RA, Larson DR, Therneau TM, et al. Long-term follow-up of monoclonal gammopathy of undetermined significance. N Engl J Med. 2018;378(3):241-249. doi:10.1056/NEJMoa1709974
5. National Institute of Diabetes and Digestive and Kidney Diseases. Chronic kidney disease tests and diagnosis. Reviewed October 2016. Accessed November 13, 2026. https://www.niddk.nih.gov/health-information/kidney-disease/chronic-kidney-disease-ckd/tests-diagnosis
6. Jolles S, Borrell R, Zouwail S, et al. Calculated globulin (CG) as a screening test for antibody deficiency. Clin Exp Immunol. 2014;177(3):671-678. doi:10.1111/cei.12369