Finding the right tests…
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Finding the right tests…
Biochemistry
Globulin is the second half of the total protein picture in your blood — the part that isn't albumin. Your liver makes some of these proteins and your immune system makes the rest, so this single number reflects two very different jobs: fighting infection and supporting liver and kidney function. Doctors don't usually order a globulin test in isolation; it's normally reported alongside total protein and albumin as an albumin-to-globulin, or A/G, ratio. A raised globulin level can mean ongoing infection or inflammation, while a low one more often points toward the liver, the kidneys, or poor nutrition. The A/G ratio, not the globulin number alone, is usually what your doctor reads first.
This test calculates globulin by subtracting your albumin level from your total protein level, rather than measuring globulin directly on its own. Because globulins include antibodies made by your immune system as well as proteins made by your liver, the result reflects both immune activity and liver function at once. It's almost always reported with the albumin-to-globulin ratio so a shift in either protein type stands out clearly.
Most labs don't isolate globulin directly — they measure total protein and albumin, then get globulin by subtraction. That's why this test is rarely ordered by itself; it comes as part of a total protein and A/G ratio panel.
Because globulins include the antibodies your immune system produces, a raised level often points to ongoing infection, chronic inflammation, or an immune condition. Certain cancers, including multiple myeloma, and tuberculosis have also been linked with high globulin readings, which is one reason an unexplained rise gets followed up rather than ignored.
Low globulin more often traces back to the liver or kidneys — conditions that either reduce how much protein the liver makes or let protein leak out through the kidneys — or to malnutrition, where the body isn't getting enough protein to work with.
A normal A/G ratio sits slightly above 1, meaning you'd expect somewhat more albumin than globulin in a healthy result. When that balance shifts — either because globulin rises or albumin falls — the ratio moves even if the total protein number looks unremarkable, which is why your doctor reads the ratio alongside both individual numbers rather than globulin in isolation.
Globulin is usually reported with total protein around 6.3 to 8.0 g/dL and albumin around 3.9 to 4.9 g/dL, with globulin making up the difference between the two. Ranges vary by lab, so use the figures printed on your own report.
A raised globulin level often reflects your immune system making more antibodies than usual, which can happen with infection, chronic inflammation, or certain immune disorders. It's sometimes also linked with specific cancers, so your doctor looks at the full picture rather than this number alone.
Low globulin more often points to the liver not making enough protein, the kidneys losing protein, or poor nutrition. Your doctor usually checks it alongside albumin and total protein to see which is driving the change.
This page is general information about the test, not medical advice. Your own report's reference ranges apply — please discuss your results with your doctor.
The albumin-to-globulin ratio shows the balance between the two main blood proteins, which can shift even when the total protein number looks normal. A normal ratio is slightly above 1, and moving away from that in either direction points your doctor toward different causes.
Requirements can vary depending on what else is being tested alongside it. Ask your doctor or the centre what's needed before your appointment.
Yes. Certain medicines and physiological states, including pregnancy, can shift protein levels, so tell your doctor about anything you're taking or any relevant history before your result is interpreted.