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Beta Globulin (total), SPEP (percent)

The share of your serum protein in the beta zone on electrophoresis, mostly transferrin plus complement and some IgA and IgM. Reported as a percent.

AI-drafted. Awaiting verificationLOINC 13982-4

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What it is

Protein electrophoresis uses an electric current to sort the proteins in your blood serum into groups. The beta group sits between alpha-2 and gamma. Its best-known protein is transferrin, which carries iron. It also holds complement proteins and some IgA and IgM antibodies, and on gel methods it holds LDL particles. Some labs report one combined beta result. Others split it into beta-1 and beta-2.

Why it matters

The beta band rises when the body makes more transferrin, as it does in iron deficiency, and it also rises with pregnancy and estrogen treatment. It can change with some blood fat disorders and liver or bile-duct conditions too. Because IgA and IgM antibodies travel here, a narrow spike in the beta zone is something clinicians look for when checking for a single type of antibody protein. Most results outside the range have simple explanations. Your clinician reads this together with the rest of the pattern.

If it’s low

A lower beta band is less common. It can go with poor nutrition or with a very low LDL cholesterol level. Many other things can cause this, and your clinician can put it in context.

Common causes

  • A result just under the lower limit, which happens in a small share of healthy people because ranges are set that way
  • Very low LDL cholesterol (LDL travels in the beta zone on gel methods)
  • Protein malnutrition

What can help

  • Ask whether your lipid panel could explain a low beta band
  • Ask whether your nutrition could be a factor and how to get enough protein

If it’s high

A higher beta band means more of the proteins that travel in this zone are present. A common reason is low iron, because the body makes more transferrin to catch iron. Pregnancy and estrogen treatment also raise it. Less often, liver or bile-duct conditions, some blood fat disorders, an underactive thyroid, kidney protein loss, or one type of antibody made in large amounts by a group of plasma cells can be involved. Many other things can cause this, and your clinician can put it in context.

Common causes

  • Iron deficiency (the body makes more transferrin)
  • Pregnancy, especially the third trimester
  • Estrogen therapy
  • High cholesterol or other blood fat disorders (LDL travels in the beta zone on gel methods)
  • Bile-duct blockage or biliary cirrhosis
  • Underactive thyroid
  • Nephrotic syndrome (a kidney condition with heavy protein loss in the urine)
  • Diabetes, in some cases
  • Plasma cell disorders such as myeloma, especially IgA types

What can help

  • Ask whether iron tests such as ferritin and transferrin saturation would help if low iron is possible
  • Ask whether pregnancy or estrogen treatment could explain it
  • Ask whether your cholesterol and liver tests fit with this result

Usual ranges

What labs print as the reference range, by who was tested. Ranges differ a little between labs, so the range on your own report is the one your result is judged against.

For adults: 8–13 %. Source: Diagnostics (Basel), International Journal of General Medicine.

What can affect your result

  • Iron status: low iron raises transferrin and the beta band
  • Pregnancy and estrogen therapy raise it
  • Blood fats: LDL travels in the beta zone on gel methods, but with capillary methods lipoproteins travel with albumin
  • Changes in the other fractions: the share is relative, so a big rise in another fraction can push it down
  • Method: some labs report one beta fraction and others report beta-1 and beta-2 separately
  • The result is a share of the total, so a change in another fraction (for example a rise in antibodies) moves it even when the amount of this protein has not changed.
  • A blood sample in which red cells broke open (hemolysis) can distort the alpha and beta zones and create false patterns.
  • Plasma instead of serum adds fibrinogen, which can show up as an extra band. ARUP does not accept plasma for this test.
  • Iodinated contrast dye and some antibiotics can cause artifacts on the tracing.
  • Certain medicines can affect protein results (MedlinePlus). Check with your clinician before changing any medicine.
  • Some sources say you may be asked not to eat or drink for up to 12 hours before the draw (MedlinePlus), while others say no preparation is needed (Cleveland Clinic). Follow the instructions from your lab.

Depends on the cause. Changes from iron status or pregnancy follow those conditions, and inflammation can also move this band.

When to talk to a clinician

Talk with your clinician if your lab flagged this result, or if the report describes a narrow band or spike in the beta zone. Let them know sooner about bone pain or back pain that has no clear cause, a fracture after a minor injury, or unusual tiredness.

Questions you could ask

  • How does the beta result fit with my other protein fractions?
  • Could low iron, pregnancy or estrogen treatment explain a higher beta band?
  • Does the graph show anything other than a broad rise in this zone?
  • Do my cholesterol and liver tests fit with this result?
  • Could my cholesterol level or my nutrition explain a lower beta band?

Questions people ask

Why does my report show beta-1 and beta-2 instead of one beta result?

Some lab instruments can split the beta zone into two parts. Beta-1 is mostly transferrin, and beta-2 includes lipoprotein. Together they make the combined beta fraction, but each part has its own range.

How can I turn this percent into g/dL?

Multiply the percent by your total protein and divide by 100. For example, an 11% beta share with a total protein of 7.0 g/dL is 0.77 g/dL.

Can low iron change this result?

Yes. When iron is low, the body makes more transferrin, the main protein in the beta zone, so the beta band can rise. If iron is a possible cause, your clinician may check iron tests.

Show the science and sources

For clinicians and researchers

The beta zone is often resolved into beta-1 (mostly transferrin) and beta-2 (which contains beta-lipoprotein). IgA, IgM, sometimes IgG, and complement proteins also travel in the beta region, and C-reactive protein lies between beta and gamma (AFP 2005). Capillary systems separate beta-1 from beta-2 better than agarose gel (J Clin Med 2025). With capillary electrophoresis, lipoproteins co-migrate with albumin instead of the beta zone (Lichtinghagen 2010), so lipid-related changes in beta apply mainly to gel methods. Monoclonal proteins, especially IgA, can migrate in the beta zone, and a beta-migrating M-protein is the hardest to quantify because other proteins co-migrate there (J Clin Med 2025). A sample with hemolysis and fibrinogen interference showed a peak in beta-1 (J Clin Med 2025); fibrinogen is present in plasma, not serum, and ARUP does not accept plasma. Software reports the zone as a percent of the total area, so a large M-spike or polyclonal rise in gamma globulin can lower the beta percent without any fall in the amount of beta protein; percent x total protein / 100 gives the g/dL value. Intervals are method specific: Sebia Capillarys reports beta-1 4.7-7.2% and beta-2 3.2-6.5% separately (Bikila 2022 Table 4), and a Spanish hospital paper quotes 8-13% for total beta as a typical normal pattern (Fernandez-Gomez 2023). Beta-2 intervals differ by sex in a 52,293-person health check-up dataset from Beijing (Ma 2025).

LOINC 13982-4 (primary). Specimen: serum.

Sources

  1. Utility of the Serum Protein Electrophoresis in the Opportunistic Screening for the Deficiency of Alpha-1 Antitrypsin, Diagnostics (Basel) (2023)
  2. Establishment of Reference Intervals for Serum Protein Electrophoresis of Apparently Healthy Adults in Addis Ababa, Ethiopia, International Journal of General Medicine (2022)
  3. Understanding and Interpreting Serum Protein Electrophoresis, American Family Physician (2005)
  4. Protein electrophoresis - serum, MedlinePlus (National Library of Medicine) (2026)
  5. Multiple Myeloma Laboratory Diagnostics Made Simple: Practical Insights and Key Recommendations, Journal of Clinical Medicine (2025)
  6. Evaluation of an automated capillary electrophoresis system for serum protein electrophoresis with the determination of gender-specific reference values, Clinical Laboratory (2010)
  7. Feasibility evaluation of big data algorithms for establishing serum protein electrophoresis reference intervals using Hoffmann and refineR methods, Clinica Chimica Acta (2025)
  8. Protein Electrophoresis, Serum (test 0050640), ARUP Laboratories
  9. Serum Protein Electrophoresis (SPEP) Test, Cleveland Clinic
  10. LOINC code lookup (NLM Clinical Tables), National Library of Medicine

AI-drafted. Awaiting verification. Last reviewed 2026-10-03. How we build and check these pages.

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