Albumin · low result
Low albumin levels: causes, symptoms and what to do
Short answer
Albumin is the main protein in blood, made by the liver, and most labs call it low under about 3.5 g/dL. A low result rarely means too little protein in the diet. Far more often the liver is making less of it because the body is inflamed or ill, the liver itself is damaged, or albumin is being lost through the kidneys or gut. Extra fluid in the blood dilutes it too. The level matters most below about 3.0 g/dL, when fluid starts to leak into the tissues and ankles swell — and it changes slowly, because albumin lasts about three weeks in the circulation.
Medically reviewed by Youmna DiStefano, MD · Last reviewed October 2026
When does this result need same-day care?
- Rapidly worsening swelling of the legs or abdomen with breathlessness, or sudden weight gain from fluid — same-week assessment, same-day if breathing is affected
- Jaundice, confusion, vomiting blood or black stools alongside a low albumin — signs of advanced liver disease that need urgent care
- Frothy urine with marked swelling in a child or young adult — nephrotic syndrome is treated early
What is the normal range for Albumin?
- age 18+: 3.50 – 5.00 g/dL
Can reflect liver disease, kidney protein loss, malnutrition, or chronic inflammation.
Full reference table, citations and testing options: Albumin biomarker page.
What are the common causes of low Albumin?
- Inflammation, infection, recent surgery or any significant illness — the liver switches from making albumin to making acute-phase proteins, and albumin can fall by 1 g/dL or more within days; this is the single most common cause and reverses as the illness resolves
- Liver disease that has reduced the liver's capacity to make protein — cirrhosis from any cause (alcohol, fatty liver, viral hepatitis); albumin is one of the three numbers in the Child-Pugh score for that reason
- Kidney disease that lets protein leak into the urine — nephrotic syndrome (more than 3.5 g of protein a day), diabetic kidney disease, glomerulonephritis
- Protein lost through the gut — protein-losing enteropathy from inflammatory bowel disease, celiac disease, intestinal lymphangiectasia or severe gut infections
- Too little protein coming in or being absorbed — malnutrition, anorexia, bariatric surgery, malabsorption; albumin is a late and unreliable marker of this, so a normal albumin does not rule it out
- Dilution — intravenous fluids, heart failure, pregnancy (albumin runs about 0.5–1 g/dL lower in the third trimester), and overhydration
- Burns, large wounds and prolonged bed rest, which shift albumin out of the bloodstream
- Hypothyroidism and, mildly, older age; a lab-draw artefact (a sample taken from an arm receiving IV fluid) is worth excluding before anything else
What symptoms go with low Albumin?
- Often none when mildly low — a result between 3.0 and 3.5 g/dL is usually an incidental finding on a metabolic panel
- Swelling of the ankles and lower legs, puffiness around the eyes on waking, and in more marked cases fluid in the abdomen (ascites) or around the lungs
- Foamy urine when the kidneys are the route of loss; diarrhea or bloating when the gut is
- Fatigue, muscle wasting and slow wound healing when poor intake or chronic illness is the driver
- Symptoms of the cause itself: jaundice and easy bruising with liver disease, joint pain or fever with inflammatory conditions
What do clinicians usually check next?
- Read it with the rest of the panel: a low albumin with a high CRP is inflammation until proven otherwise; with raised bilirubin, low platelets or a prolonged INR it points to the liver; with protein in the urine it points to the kidneys
- C-reactive protein (hs-CRP or standard CRP) — the single most useful companion, because inflammation is the usual explanation
- Liver panel plus INR and a platelet count (CBC) to judge the liver's synthetic function
- Urine albumin-to-creatinine ratio or protein-to-creatinine ratio, and a urinalysis — kidney loss is confirmed in the urine, not the blood
- Corrected calcium: measured total calcium reads low when albumin is low; add 0.8 mg/dL for every 1 g/dL that albumin sits below 4.0 before concluding calcium is actually low
- Celiac screen (tTG-IgA with total IgA), TSH, and a stool alpha-1 antitrypsin when the gut is suspected; a dietary and weight history when intake is
- Repeat once well — if the low value appeared during an illness, a recheck 4–6 weeks later usually settles whether anything else needs chasing
Follow-up tests available at TestWell: CBC with Differential Test ($17.99), Platelet Count Test ($14.99), Heart & Body Inflammation Test (hs-CRP) ($26.99), TSH Test (Thyroid Stimulating Hormone) ($20.99), TSH with Reflex to Free T4 Test ($29.99), TSH + Free T4 Test ($27.99).
How do you recheck Albumin?
Prices are cash-pay; every order adds one $6 lab processing fee. Physician authorization is included; no insurance or referral needed.
| Test or panel | Type | Price | Fasting | Results |
|---|---|---|---|---|
| Liver Health Panel | Panel · 4 tests | $59.99 | No | 2–5 business days |
| Fatty Liver Panel | Panel · 6 tests | $92.99 | Yes | 2–4 business days |
| Post-COVID Recovery Panel | Panel · 7 tests | $99.99 | Yes | 2–4 business days |
| Liver Function Panel | Test · 7 biomarkers | $19.49 | No | 1–3 business days |
Common questions
What is a low albumin level?
Below the lab's reference range, which for most adults starts at about 3.5 g/dL (some labs 3.4 or 3.9). Between 3.0 and 3.5 is mildly low and very often explained by a recent illness; 2.5–3.0 is moderately low and usually comes with some swelling; under 2.5 g/dL is markedly low and almost always reflects significant liver, kidney or gut disease or severe illness. The number is read alongside CRP, the liver panel and a urine protein test rather than on its own.
Does low albumin mean I'm malnourished?
Usually not. Albumin was once used as a nutrition marker, but inflammation lowers it far faster and more reliably than diet does — a healthy person who eats very little protein for weeks keeps a near-normal albumin, while someone with pneumonia drops a gram in days. Guidelines now treat albumin as a marker of inflammation and illness severity, not of protein intake. Weight history, muscle mass and a dietitian's assessment judge nutrition; albumin mostly tells you how sick someone has been.
What causes low albumin and high CRP together?
An acute-phase response: the liver is diverting its protein-making capacity to inflammatory proteins such as CRP and away from albumin. Infections, autoimmune flares, recent surgery, injury and some cancers all do this. The pattern itself does not say which; the history usually does, and the albumin recovers over weeks as the CRP falls. If CRP is normal, inflammation is unlikely and attention shifts to the liver, kidneys and gut.
How can I raise my albumin?
By treating what is lowering it. Albumin made by the liver has a half-life of about three weeks, so it recovers slowly after an illness ends, and no food or supplement speeds that up in a well-nourished person. If intake genuinely is the problem — a poor appetite, malabsorption, a restrictive diet — adequate protein and calories do help, ideally with a dietitian. Liver and kidney causes need their own treatment; albumin infusions are used only in hospital for specific situations such as large-volume fluid removal in cirrhosis.
What albumin level is dangerous?
There is no single cutoff, but under 2.5 g/dL is where complications become likely: fluid leaks into the legs, abdomen and lungs, wounds heal poorly, and some medications that bind to albumin behave unpredictably. In hospital, a low albumin on admission predicts a longer stay and more complications across many conditions, which is why it is watched closely in surgery and intensive care. Outside hospital the question is less the number than the trend and the cause behind it.
Can low albumin be a sign of cancer?
It can accompany cancer, but it is not a cancer test. Advanced cancers lower albumin through inflammation, poor appetite and sometimes liver involvement, and a falling albumin is one of several markers oncologists use to gauge how a patient is coping. In someone otherwise well with a mildly low albumin and no other abnormal results, cancer is well down the list of explanations behind a recent infection, a liver or kidney cause, or a dilutional effect — and a repeat when well is the first step.
Why does low albumin change my calcium result?
Roughly 40% of the calcium in blood is bound to albumin, and the standard calcium test measures the total. When albumin is low, the bound portion falls and total calcium reads low even though the active, ionized calcium is normal. The correction is simple — add 0.8 mg/dL to the measured calcium for every 1 g/dL that albumin is below 4.0 — and most labs or clinicians apply it automatically. An ionized calcium measures the active fraction directly when the correction is in doubt.
Educational content, not a diagnosis. Lab results are one input; a clinician interprets them with your history and exam.