Finding the right tests…
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Finding the right tests…
Biochemistry
Albumin is the single most common protein in your blood, and your liver is the only place that makes it. Its main job isn't chemical — it's physical: albumin molecules are large enough to hold water inside your blood vessels rather than let it leak into surrounding tissue, and they also ferry hormones, medicines, and vitamins to wherever your body needs them. Because the liver makes it continuously, a low albumin level often reflects weeks of reduced liver function or poor nutrition, not a sudden change. Doctors read it alongside other results rather than alone, since infection, inflammation, and kidney losses can all pull the number down for reasons that have nothing to do with the liver itself.
The test reports albumin concentration in your blood, usually in grams per decilitre. Because your liver makes albumin steadily over time, the level tends to move slowly rather than day to day, which is part of why it's used to gauge longer-term protein status rather than a sudden change. Low albumin can come from the liver making less of it, the kidneys losing it into urine, malnutrition, or ongoing inflammation elsewhere in the body. High albumin is less common as a finding and usually points to dehydration concentrating the blood rather than a disease process.
Roughly 3.4 to 5.4 g/dL is the typical normal range for adults, though individual labs set their own cutoffs. A low result on its own doesn't say why — that's the harder question, and it's where the rest of your results, and your symptoms, come in. Liver disease reduces albumin because the liver simply makes less of it over time. Kidney disease can lower it a different way entirely, by letting albumin leak out through damaged filters into urine, which is why a urine albumin test is sometimes ordered alongside this one rather than instead of it. Malnutrition and ongoing inflammatory conditions can lower albumin too, without either the liver or kidneys being the primary problem.
Albumin also matters for reading other tests correctly, not just on its own. Around half the calcium in your blood travels attached to albumin, so a low albumin level can make a total calcium result look lower than your body's actual free calcium — which is one reason your doctor might check both together rather than calcium in isolation.
No fasting or special preparation is needed for this test by itself. It's a routine blood draw, and if it's part of a larger panel like a liver function test, check whether anything else on that form asks for fasting.
It can point to reduced liver function, kidney losses, poor nutrition, or an ongoing inflammatory condition. Because several different causes lower albumin, your doctor reads it together with other results rather than as a standalone answer.
Roughly 3.4 to 5.4 g/dL is a commonly used adult range, though exact cutoffs vary a little by lab — check the reference range printed on your own report.
About half the calcium in your blood is bound to albumin. If your albumin is low, your total calcium reading can look lower than the calcium your body actually has freely available, which your doctor accounts for when interpreting it.
Yes. Being significantly dehydrated concentrates the fluid part of your blood, which can make an albumin result look higher than your true baseline.
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.
No. Total protein includes albumin plus a second group called globulins. Albumin is reported and interpreted on its own because it behaves differently — it's made only by the liver, unlike globulins.
Not for albumin on its own. If it's ordered as part of a larger panel, check whether any other test on the same form needs fasting.
Yes. Kidney disease, malnutrition, and ongoing inflammation can all lower albumin without the liver being the underlying problem, which is why a low result usually leads to further, more specific testing.