Beta-2 Microglobulin
Beta-2 microglobulin is a protein found on the surface of most cells. Blood levels rise when the immune system is activated or when kidney filtration is impaired.
Category: Inflammation & Immune
Also known as: beta-2 microglobulin, b2m, beta 2 microglobulin, b2 microglobulin, β2-microglobulin, B2 Microglob, b2-M, beta-2 mikroglobulin
Reference range: 0.7–1.8 mg/L (Source: ABIM)
Standard unit: mg/L
High values may indicate
High beta-2 microglobulin levels may indicate kidney disease, multiple myeloma, lymphoma, leukemia, or chronic inflammatory conditions.
Low values may indicate
Low beta-2 microglobulin levels are generally not clinically significant and are considered normal.
Frequently asked questions
- What is a normal Beta-2 Microglobulin level?
- A typical reference range for Beta-2 Microglobulin is 0.7–1.8 mg/L (source: ABIM). Reference ranges vary by laboratory, age, and sex, so always compare against the range on your own lab report.
- What units is Beta-2 Microglobulin measured in?
- Beta-2 Microglobulin is most commonly reported in mg/L. Labs in different countries may use other units — you can convert between them with BloodId's blood test unit converter.
- Where do Beta-2 Microglobulin reference ranges come from?
- BloodId uses ABIM standard reference ranges and educational information from MedlinePlus (see our methodology). Reference ranges still vary by lab, age, and sex, so always compare against your own report.
- Can I track Beta-2 Microglobulin over time?
- Yes. Upload results from any lab and BloodId charts your Beta-2 Microglobulin over time against its reference range, so you can see whether the trend is rising, falling, or stable.
Related biomarkers
Source: MedlinePlus, U.S. National Library of Medicine
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