Albumin: Normal Range, What High & Low Levels Mean

Albumin measures the level of the most abundant protein in your blood, which your liver produces. It has three main roles: keeping fluid balanced between your blood vessels and surrounding tissues, transporting hormones, drugs, and fatty acids around your body, and reflecting how well your liver is synthesizing protein. Because the liver is solely responsible for making albumin, the result gives doctors a useful snapshot of both your liver's function and your overall nutritional status. Low or high readings can each point to specific underlying processes worth investigating. Always discuss your individual result with your healthcare provider.

For adults aged 18 and older, the standard reference range for albumin in the blood is 3.4 to 5.4 g/dL (grams per deciliter), according to Mayo Clinic Laboratories. A result that falls anywhere within that window is generally considered normal. Keep in mind that reference ranges can vary slightly between laboratories depending on the equipment and methods they use, so always interpret your result against the range printed on your own lab report. A value inside the normal range is reassuring but not the whole picture — your healthcare provider is best placed to interpret it alongside your other results.

A result above 5.4 g/dL is considered elevated. The most common reason is dehydration — when the fluid volume in your blood decreases, the concentration of albumin rises even though your liver hasn't produced more of it. A high-protein diet combined with dehydration can have the same effect. A technical factor can also play a role: if a tourniquet was left on your arm too long during the blood draw, it can cause a spuriously high reading that doesn't reflect your true level. High albumin on its own rarely causes symptoms, and the finding often resolves once hydration is restored. Discuss your result with your healthcare provider to identify the most likely cause.

Low albumin — a result below 3.4 g/dL — can develop for several reasons. Liver diseases such as cirrhosis or hepatitis reduce the liver's ability to synthesize albumin. Malnutrition or prolonged fasting means the body lacks the raw protein materials to make it. Nephrotic syndrome causes albumin to leak out through the kidneys into urine. Severe or prolonged illness triggers an inflammatory response that actively lowers albumin levels. Conditions like inflammatory bowel disease, protein-losing enteropathy, major burns, heart failure, and hypothyroidism can all contribute as well. Because so many different conditions can lower albumin, your healthcare provider will use additional tests and your clinical history to identify the underlying cause.

When albumin is low, the most visible sign is often oedema — noticeable swelling in your ankles, feet, or abdomen (called ascites) — because albumin is no longer holding fluid inside your blood vessels. You might also notice fatigue, muscle wasting, unintentional weight loss, wounds that are slow to heal, a greater susceptibility to infections, brittle nails, or thinning hair. When albumin is high due to dehydration, you may experience thirst, dark-coloured urine, or a dry mouth. These symptoms overlap with many other conditions, so a single symptom is never a diagnosis on its own. Please speak with your healthcare provider about any symptoms you're experiencing alongside your albumin result.

A single result that sits just outside the reference range doesn't automatically mean something is seriously wrong. Lab values can shift due to hydration status, the timing of your last meal, a recent illness, or even how the sample was collected. What matters more is the pattern over time and how the number fits with your overall health picture — your symptoms, your other lab values, and your medical history. Serumo lets you track your albumin across multiple tests so you can see trends rather than reacting to one data point in isolation. That trend data can be genuinely useful to share with your healthcare provider, who can place your result in the right clinical context.