--- title: "Globulin levels: what globulins are, the normal range and A/G ratio, and what high or low globulin means" type: biomarker url: "https://www.test-well.com/biomarkers/globulin" also_known_as: - globulin - globulin, total - total globulin - globulins - globulin (calc) category: Metabolic Health units: - g/dL reviewed_at: 2026-11-03 --- # Globulin levels: what globulins are, the normal range and A/G ratio, and what high or low globulin means > Globulin is measured with a standard blood draw; no fasting is needed. A typical reference range is 2 – 3.5 g/dL. TestWell offers panels that include Globulin, drawn at Quest or Labcorp. An out-of-range result is a prompt to look closer, not a diagnosis. Globulin is not one protein but a family: the antibodies your immune system makes plus the transport and clotting proteins the liver makes. On a metabolic panel it is calculated — total protein minus albumin — and reported with the albumin-to-globulin (A/G) ratio. A high globulin usually means chronic inflammation, liver disease or an antibody-producing condition; a low one means too few antibodies or protein lost through the kidneys or gut. Also known as: globulin, globulin, total, total globulin, globulins, globulin (calc). ## Key facts | Fact | Value | | --- | --- | | Units | g/dL | | Sample | Blood | | Fasting | Not required | | Results | 1–3 business days | | Labs | Quest or Labcorp | ## What does the globulin test measure? Blood protein is roughly 60% albumin and 40% globulins. The globulins split into alpha-1 and alpha-2 (transport proteins such as alpha-1 antitrypsin, haptoglobin and ceruloplasmin), beta (transferrin, complement, some lipoproteins) and gamma — the immunoglobulins IgG, IgA and IgM that antibodies are made of. The liver makes the alpha and beta fractions; plasma cells of the immune system make the gamma fraction. On a comprehensive metabolic panel the globulin figure is not measured directly. The lab measures total protein and albumin and subtracts one from the other, then divides to give the albumin-to-globulin ratio, which is normally a little above 1. Because it is a calculation, the globulin moves whenever either input moves: a low albumin with a normal total protein reads as a high globulin even when nothing is wrong with the antibodies. A high or low result says that the protein mix has shifted, not which protein shifted. The test that answers that question is serum protein electrophoresis, which separates the fractions into a curve, with immunofixation to identify an abnormal antibody when one shows up. ## Who should check their globulin? Almost everyone already does: globulin and the A/G ratio come with every comprehensive metabolic panel, hepatic panel and total protein test, so it is one of the most frequently reported numbers people have never been told about. It is looked at deliberately in people with unexplained fatigue, bone pain, recurrent infections, anemia or a high ESR; in liver disease, where a rising globulin with a falling albumin tracks cirrhosis; and in autoimmune and chronic infectious conditions that keep the immune system switched on. A low globulin earns attention in people who keep getting sinus, chest or gut infections, who have unexplained protein in the urine or chronic diarrhea, or who are on long-term steroids or immunosuppressants. Repeated infections with a low globulin is the classic opening of a primary antibody deficiency that often goes years without a name. ## How to get a globulin test and prepare for it Globulin is part of the comprehensive metabolic panel and the hepatic function panel, both of which you can order online through TestWell for a walk-in draw at Quest or Labcorp without a doctor's visit; it is also on the total protein test when ordered alone. If the question is specifically about an abnormal antibody, a serum protein electrophoresis is the targeted follow-up and is ordered as its own test. No preparation is needed for globulin itself, though the metabolic panel it travels with calls for an 8–12 hour fast for the glucose. Drink normally: dehydration concentrates all blood proteins and nudges both albumin and globulin up together, which leaves the ratio unchanged but can push a borderline globulin over the line. ## What is the normal range for Globulin? | Population | Reference range | | --- | --- | | age 18+, calculated: total protein − albumin | 2 – 3.5 g/dL | Reference intervals differ slightly between labs; the range printed on your report is the one to interpret against. Ranges are usually set so 95% of healthy people fall inside them. ## Normal globulin levels and the A/G ratio Most laboratories report a globulin reference range of about 2.0 to 3.5 g/dL in adults, with the exact limits varying by lab because the figure depends on how that lab measures albumin. The albumin-to-globulin ratio normally runs from about 1.1 to 2.5. A ratio below 1 means globulins outnumber albumin, which is the pattern of chronic liver disease, chronic inflammation or an antibody-producing disorder; a high ratio usually means a low globulin. Children and older adults sit at the lower and upper ends respectively, pregnancy lowers albumin and so raises the calculated globulin, and a result from a lab that uses a different albumin method is not directly comparable. The result on your TestWell report shows the performing laboratory's own range, which is the one that applies. ## What does a high globulin mean? The common causes are the ones that keep the immune system producing antibodies: chronic infections such as hepatitis B or C and HIV, autoimmune disease such as rheumatoid arthritis, lupus and Sjögren's, and chronic liver disease, where cirrhosis raises the gamma fraction while albumin falls, often driving the A/G ratio below 1. Chronic inflammatory conditions of the bowel and lung, sarcoidosis and some chronic kidney disease do the same. These produce a broad, polyclonal rise — many different antibodies, modestly increased. A narrower cause is a single clone of plasma cells over-producing one antibody: monoclonal gammopathy of undetermined significance (MGUS), which is common after 50 and usually harmless but monitored, and multiple myeloma, which is not. A globulin that is high while albumin is normal or low, especially with anemia, a high calcium, kidney impairment, bone pain or a very high ESR, is the picture that prompts electrophoresis and immunofixation promptly. Dehydration raises the figure a little along with every other protein, and a low albumin from any cause raises the calculated globulin without the globulins having changed. Those two explanations are checked first. ## What does a low globulin mean? Low globulin means fewer antibodies in circulation or antibodies leaving the body faster than they are made. Primary immune deficiencies such as common variable immunodeficiency and X-linked agammaglobulinemia reduce production; so do long-term corticosteroids, some immunosuppressants and chemotherapy, and blood cancers such as chronic lymphocytic leukemia and myeloma itself, which can suppress normal antibodies while over-producing an abnormal one. Protein loss explains most of the rest: nephrotic syndrome spills antibodies into the urine, protein-losing enteropathies and severe inflammatory bowel disease lose them into the gut, and extensive burns lose them through the skin. Malnutrition and advanced liver disease lower the liver-made fractions. A mildly low globulin with a normal total protein in a well person is usually a calculation effect of a high albumin — typically hemoconcentration — and repeats normal. ## What to test next when globulin is abnormal For a high globulin: repeat it hydrated, then serum protein electrophoresis with immunofixation to tell a polyclonal rise from a monoclonal protein; a complete blood count, calcium, creatinine and an ESR or CRP alongside; liver tests and hepatitis B and C and HIV screening when the pattern is polyclonal; and a free light chain assay and a hematology referral when a monoclonal band appears. For a low globulin: quantitative immunoglobulins (IgG, IgA, IgM), a urinalysis with the albumin-to-creatinine ratio for kidney loss, a medication review, and, with recurrent infections, specific antibody responses to vaccines in an immunology clinic. ## What does a high Globulin mean? Often reflects chronic inflammation or infection, liver disease, or a condition that drives antibody production; a persistent rise is usually followed by protein electrophoresis. ## What does a low Globulin mean? Can reflect reduced antibody production (immune deficiency), protein loss through the kidneys or gut, or liver disease. - [What a high Globulin means (causes, symptoms, next steps)](https://www.test-well.com/biomarkers/globulin/high) - [What a low Globulin means (causes, symptoms, next steps)](https://www.test-well.com/biomarkers/globulin/low) ## Common questions about Globulin ### What is a normal globulin level? About 2.0 to 3.5 g/dL in adults, with an albumin-to-globulin ratio of roughly 1.1 to 2.5. Limits vary by laboratory because globulin is calculated from that lab's total protein and albumin; your report shows the performing lab's range. ### What is the A/G ratio and why does it matter? Albumin divided by globulin, normally a little above 1. A ratio below 1 means globulins outnumber albumin, which is seen in cirrhosis, chronic inflammation and antibody-producing disorders; a high ratio usually reflects a low globulin. The ratio is a pattern cue, not a diagnosis. ### Is globulin the same as immunoglobulin? No. Immunoglobulins (antibodies) are the gamma globulin fraction, the largest part of globulin. Globulin also includes the liver-made alpha and beta proteins — transferrin, haptoglobin, complement and others. Protein electrophoresis separates the fractions when the total is abnormal. ### Do I need a doctor's order to test my globulin? No. TestWell's licensed physician network reviews and approves your order — usually within minutes. You can place an order online without an in-person visit or a referral from your own doctor. ### How long does it take to get Globulin results? Most Globulin results are available in 1–3 business days after your specimen arrives at the lab. You'll get an email the moment your results are ready, with everything viewable in your TestWell portal. ### Where can I order a Globulin test? TestWell offers panels that include Globulin alongside related markers. Browse our test catalog to find the panel that fits your goals. ### Do I need to fast before my Globulin test? Fasting is not required for the Globulin test. You can have your blood drawn any time of day. ### Which lab will process my Globulin test? Your test will be processed by Quest Diagnostics, Labcorp, or BioReference depending on which is closest to you and which lab carries the test. All three are CLIA-certified and trusted by hospitals nationwide. You'll choose your lab during checkout from 4,000+ locations. ## Keep reading - [Metabolic Lab Testing: Which Panel Do You Actually Need?](https://www.test-well.com/guides/metabolic-lab-testing) - [CMP vs BMP: What's the Difference, and Which Metabolic Panel Do You Need?](https://www.test-well.com/guides/cmp-vs-bmp) - [How to Read Your Blood Test Results, Line by Line](https://www.test-well.com/guides/how-to-read-your-blood-test-results) - [Fatigue: which blood tests?](https://www.test-well.com/symptoms/fatigue) - [Swollen ankles and legs: which blood tests?](https://www.test-well.com/symptoms/swollen-ankles) - [Before your test: Hydration](https://www.test-well.com/prep/hydration) - [Before your test: Fasting](https://www.test-well.com/prep/fasting) ## Sources - [MedlinePlus (NIH) — Total Protein and Albumin/Globulin (A/G) Ratio](https://medlineplus.gov/lab-tests/total-protein-and-albumin-globulin-a-g-ratio/) - [Labcorp — Globulin, Total (001073)](https://www.labcorp.com/tests/001073/globulin-total) - [Mayo Clinic Laboratories — Protein, Total and Electrophoresis, Serum](https://www.mayocliniclabs.com/test-catalog/overview/8160) - [MedlinePlus — Total protein and albumin/globulin (A/G) ratio](https://medlineplus.gov/lab-tests/total-protein-and-albumin-globulin-ag-ratio/) - [MedlinePlus — Protein electrophoresis, serum](https://medlineplus.gov/lab-tests/protein-electrophoresis-blood-test/) - [International Myeloma Working Group criteria for monoclonal gammopathies (Rajkumar SV, et al. Lancet Oncol 2014)](https://pubmed.ncbi.nlm.nih.gov/25439696/) - [Bonilla FA, et al. Practice parameter for the diagnosis and management of primary immunodeficiency (J Allergy Clin Immunol 2015)](https://pubmed.ncbi.nlm.nih.gov/26371839/) ## Related biomarkers - [Glucose](https://www.test-well.com/biomarkers/glucose) - [Creatinine](https://www.test-well.com/biomarkers/creatinine) - [eGFR](https://www.test-well.com/biomarkers/egfr) - [BUN](https://www.test-well.com/biomarkers/bun) - [ALT](https://www.test-well.com/biomarkers/alt) - [AST](https://www.test-well.com/biomarkers/ast) - [Reference range lookup tool](https://www.test-well.com/tools/reference-range-lookup) - [Lab unit converter](https://www.test-well.com/tools/lab-unit-converter) - [All biomarkers](https://www.test-well.com/biomarkers) --- Medically reviewed by Youmna DiStefano, MD (Medical Reviewer, TestWell); last reviewed 2026-11-03. Review policy: https://www.test-well.com/reviewers/youmna-distefano-md Canonical page: https://www.test-well.com/biomarkers/globulin Machine-readable catalog: https://www.test-well.com/api/catalog.json · MCP server: https://www.test-well.com/mcp · Overview for agents: https://www.test-well.com/llms.txt Prices are cash-pay, in USD, and include physician authorization; every order adds one flat $6 lab processing fee. Educational content is not a diagnosis — discuss results with a clinician.