Direct answer
The albumin blood test measures the concentration of albumin, the main protein made by the liver, in a blood sample. The albumin test helps assess liver synthetic function, protein loss through the kidneys or gut, and the effect of illness or inflammation. A single albumin value cannot diagnose any disease on its own.
Key takeaways
- Albumin is a marker, not a diagnosis. Low albumin points towards a problem but does not name it.
- Albumin falls in acute and chronic illness because of inflammation and fluid shifts, not only because of poor nutrition.
- Serum albumin and urine albumin are different tests. Kidney protein leak is assessed on urine, not on serum albumin.
- Timing and hydration matter. Dehydration and prolonged tourniquet use can raise the value; drips, pregnancy and lying down can lower it.
- Interpretation belongs to the doctor who ordered the test, alongside your history, examination and other results.
At a glance
| Item | Detail |
|---|---|
| Sample | Venous blood, usually from the arm |
| Time for the blood draw | Usually 5-10 minutes including registration at the counter; the needle is in the vein for under a minute |
| Fasting | Not needed for albumin alone; may be needed for other tests on the same sample |
| Usually part of | Liver function test (LFT), comprehensive metabolic panel, total protein and A:G ratio |
| Units | g/dL in most Indian labs; g/L in some |
| Reported with | Total protein, globulin, bilirubin, ALT (SGPT), AST (SGOT), ALP |
| Report availability | Varies by laboratory; ask your collection centre |
Also known as
- Serum albumin test
- Blood albumin level
- Part of "LFT" or "liver test" as commonly requested in India
- Reported with SGPT/SGOT on the same liver panel
- Albumin-globulin ratio (A:G ratio) when total protein is measured too
What the albumin test is
Albumin is the most abundant protein in blood plasma and is made only by the liver. Albumin holds fluid inside blood vessels (oncotic pressure) and carries calcium, bilirubin, hormones, fatty acids and many medicines. The albumin test measures how much albumin is circulating at that moment.
Most Indian laboratories measure serum albumin by a dye-binding method (bromocresol green or bromocresol purple). These two methods do not always give identical numbers on the same sample, which is one reason values from different laboratories are not directly interchangeable. Always compare results against the reference range printed on your own report.
Why the albumin test is done
- Liver assessment: albumin is one of the markers of the liver's ability to make proteins, used alongside bilirubin and prothrombin time in scores such as Child-Pugh.
- Swelling and ascites: to help explain oedema of the legs or fluid in the abdomen.
- Protein loss: when kidney disease, protein-losing bowel disease or extensive skin loss is suspected.
- Illness severity: low albumin is common in sepsis, cancer, chronic heart failure and after major surgery.
- Interpreting calcium: roughly half of blood calcium is bound to albumin, so calcium results must be read against the albumin level.
- Nutritional context: albumin contributes to the picture but is a poor stand-alone nutrition marker.
Who should get this test
- People with known or suspected liver disease, including cirrhosis, chronic hepatitis B or C, alcohol-related liver disease and steatotic liver disease (MASLD/MASH; MetALD where alcohol intake is also significant).
- People with unexplained swelling of the feet, face or abdomen.
- People with chronic kidney disease or frothy urine, alongside a urine albumin test.
- People with chronic diarrhoea, malabsorption or unexplained weight loss.
- People being assessed before major surgery, or during serious acute illness.
- People on long-term medicines that can affect the liver, including anti-tubercular therapy, methotrexate or certain antiepileptics, when the prescriber orders liver monitoring.
- People with abnormal total protein or an abnormal A:G ratio on a previous report.
Albumin is not recommended as a screening test in healthy people with no symptoms, though it commonly appears bundled in health-check packages.
What the albumin test cannot detect or exclude
- A normal albumin does not mean a healthy liver. Albumin has a long half-life (around three weeks), so it can stay normal in acute hepatitis and in early cirrhosis.
- A normal albumin does not exclude kidney disease. Serum albumin often stays normal in early diabetic kidney disease. Kidney protein leak is detected by urine albumin-to-creatinine ratio (UACR), not by serum albumin.
- Albumin does not tell you the cause. Liver disease, inflammation, infection, cancer, heart failure, gut protein loss and dilution by drip fluids all lower albumin.
- Albumin does not measure liver inflammation or fibrosis. Those need ALT/AST, imaging, elastography or, in selected cases, biopsy.
- Albumin does not diagnose or exclude malnutrition. Modern nutrition guidance treats albumin as an inflammation marker rather than a nutritional index.
- Albumin does not diagnose or exclude cancer, including multiple myeloma. Myeloma assessment requires serum protein electrophoresis, free light chains and related tests.
If your symptoms continue despite a normal albumin result, go back to your doctor rather than treating the result as reassurance.
Related but different tests
| Test | Question it answers | How it differs from serum albumin |
|---|---|---|
| Urine albumin / UACR | Is albumin leaking into the urine? | Urine test. Detects early kidney damage that serum albumin misses entirely. |
| Total protein | How much protein overall is in the blood? | Includes globulins. Total protein can be normal while albumin is low and globulins high. |
| A:G ratio | Is the balance between albumin and globulins shifted? | Derived, not measured. A low ratio prompts further testing, it does not diagnose. |
| Prealbumin (transthyretin) | Shorter-term protein turnover | Shorter half-life, but also falls with inflammation; not a reliable nutrition test either. |
| ALT (SGPT) / AST (SGOT) | Is there liver cell injury? | Enzyme leak markers. Can be high with normal albumin, and normal in advanced cirrhosis. |
| Prothrombin time / INR | Liver synthetic function, faster-changing | Responds within days, so more useful in acute liver failure than albumin. |
| Serum protein electrophoresis | Are there abnormal protein bands? | Separates protein fractions; needed when myeloma or paraproteinaemia is suspected. |
| Serum-ascites albumin gradient (SAAG) | Why has abdominal fluid collected? | Needs paired blood and ascitic fluid albumin; distinguishes portal hypertension from other causes. |
Which test comes first depends on the problem. For frothy urine or diabetes follow-up, urine albumin comes first. For jaundice, a full liver panel comes first. For unexplained anaemia with bone pain, electrophoresis is more informative than albumin alone.
How to prepare
Preparation rules are set by each laboratory and may differ from what you read here. Your own laboratory's written instructions take precedence.
- Fasting: not usually required for albumin alone. If lipids or glucose are on the same requisition, your unit may ask for an overnight fast.
- Hydration: normal fluid intake is usually advised, because marked dehydration can raise the measured value.
- Medicines: bring a list of everything you take, including steroids, hormone preparations, AYUSH products, herbal remedies and gym supplements. Do not stop or change any prescribed medicine for the test unless your prescriber instructs you.
- Posture: tell the phlebotomist if you have been lying down for long periods, as prolonged recumbency lowers albumin slightly.
- Drips: blood should not be drawn from an arm receiving intravenous fluid.
Special preparation caveats
- Diabetes on insulin or sulfonylureas: do not fast for long periods without asking your prescriber, because of hypoglycaemia risk.
- Heart failure, advanced CKD or a prescribed fluid restriction: do not increase fluid intake to "prepare". Keep to your prescribed fluid limit.
- Pregnancy: prolonged fasting is generally avoided. Albumin is physiologically lower in pregnancy.
- Children: follow the paediatric team's instructions; extended fasting is rarely appropriate.
- Older adults and people on anticoagulants: mention anticoagulant or antiplatelet use so the site can be pressed longer.
What happens during the test
- Site cleaning: the inner elbow is cleaned with an antiseptic swab.
- Tourniquet: applied briefly. A tourniquet left on too long can falsely raise protein and albumin readings.
- Blood draw: a small sample is collected into a plain or gel tube. This part takes under a minute.
- After: pressure is applied and the site is bandaged. Most people leave within a few minutes.
- Total time on site: usually 10-20 minutes including waiting, depending on how busy the collection centre is.
In infants a heel prick or a small-volume paediatric tube may be used.
Understanding your albumin report
Read your value against the reference interval printed on your own report. Reference intervals differ between laboratories, methods and age groups, and are lower in pregnancy and in newborns. Do not compare your number with a range quoted on a different report or website.
Albumin within the reference range suggests preserved synthetic function at that moment, but does not exclude liver, kidney or bowel disease.
Albumin below the reference range (hypoalbuminaemia) is common and non-specific. Recognised contributors include:
- Reduced production: cirrhosis, advanced chronic liver disease.
- Inflammation and illness: infection, sepsis, trauma, surgery, cancer, autoimmune disease.
- Loss: nephrotic syndrome, protein-losing enteropathy, extensive burns.
- Dilution: intravenous fluids, fluid overload, pregnancy.
- Reduced intake or absorption: severe malabsorption, prolonged poor intake, often alongside inflammation.
Albumin above the reference range is uncommon and usually reflects dehydration or haemoconcentration from sample handling rather than a disease that raises albumin production. A high-protein diet does not push serum albumin above normal in a person with healthy kidneys and liver.
No one should be diagnosed or treated on the basis of an albumin number alone. Results require interpretation in clinical context by the doctor who requested the test. Results vary depending on individual clinical circumstances.
When albumin results can be misleading
Falsely or artefactually raised albumin
- Dehydration, including after vomiting, diarrhoea or heat exposure.
- Prolonged tourniquet application or fist pumping during the draw.
- Sitting or standing for a long time before the draw.
- Haemolysed or lipaemic samples, depending on the assay.
Falsely or non-specifically lowered albumin
- Blood drawn from a limb receiving intravenous fluid, or after large-volume fluid resuscitation.
- Prolonged bed rest or a sample taken while lying flat.
- Pregnancy, because of increased plasma volume.
- Any acute inflammatory illness, which reduces albumin synthesis within days regardless of nutrition.
- Assay effects: bromocresol green methods may read differently from bromocresol purple methods, particularly in kidney failure.
If a result does not fit your clinical picture, a repeat sample under standard conditions is often the sensible next step.
Risks and safety
Standard venous blood draw
Venepuncture is a low-risk procedure. Possible effects include brief pain, a small bruise, light-headedness or fainting, and rarely local infection or nerve irritation. Bruising is more likely for people on anticoagulants or antiplatelet medicines.
Capillary or heel-prick sampling in infants
Discomfort and small bruising at the prick site are usual; repeated pricks can cause local soreness. Paediatric staff limit sample volume for small babies.
Tell the staff beforehand if you have fainted during blood tests previously, if you have lymphoedema or an arteriovenous fistula, or if one arm should be avoided.
Red flags
Emergency now
- Confusion, drowsiness, extreme irritability or difficulty waking someone with liver disease.
- Vomiting blood, or black tarry stools.
- Breathlessness at rest, or unable to lie flat.
- Fever with a tense, painful abdomen and abdominal fluid.
- Passing very little or no urine for many hours.
Same day
- Rapidly worsening swelling of legs, face or abdomen.
- New jaundice, dark urine or pale stools.
- Fever with chills in someone with known cirrhosis or nephrotic syndrome.
- Calf pain and swelling, or sudden one-sided leg swelling.
- New frothy urine with facial puffiness, especially in a child.
Routine appointment
- A mildly low albumin on a health-check report with no symptoms.
- An abnormal A:G ratio needing explanation.
- Gradual ankle swelling by the end of the day.
- Persistent tiredness or slow wound healing with a borderline result.
Special situations
Pregnancy
Serum albumin falls in normal pregnancy because plasma volume expands. A modestly low value is expected and does not by itself indicate malnutrition or liver disease. New swelling with high blood pressure or protein in the urine needs prompt obstetric assessment.
Children
Paediatric reference intervals differ from adult ones and vary with age, and newborn values are lower. In children, sudden facial puffiness with frothy urine raises the possibility of nephrotic syndrome and needs same-day review.
Older adults
Albumin tends to be slightly lower with age and drops further with acute illness, immobility and multiple conditions. A low albumin in an older adult is better used as a prompt for overall assessment than as a nutrition label.
Diabetes on glucose-lowering therapy
Do not fast for long periods for a blood test without asking the prescriber. In diabetes, urine albumin (UACR) and eGFR are the tests used for kidney screening, not serum albumin.
Chronic kidney disease
Low albumin is common in advanced CKD and in dialysis patients, driven by inflammation, protein loss and appetite change. Assay differences can be more pronounced in kidney failure, so trends within one laboratory matter more than isolated values.
Heart failure
Fluid overload dilutes albumin and gut congestion can reduce absorption. Do not increase fluid intake before a blood test if you have been given a fluid restriction.
The albumin test in the Indian context
- How it is requested: albumin usually arrives bundled inside an "LFT" or health-check package, printed next to SGPT and SGOT, so many people see the value without having asked for it.
- Liver disease drivers: alcohol-related liver disease, hepatitis B and C, and steatotic liver disease (MASLD/MASH) are all relevant. South Asians can develop metabolic liver disease at a lower BMI than other populations.
- Acute hepatitis E is a common cause of acute jaundice in India; albumin may stay normal early in the illness, which is why a normal albumin should not be read as reassurance in someone who is jaundiced.
- Drug-induced liver injury: anti-tubercular therapy is a frequent contributor, and some AYUSH, herbal and gym-supplement products have been linked to liver injury. Disclose everything you take.
- Nutrition and anaemia: iron-deficiency anaemia and marginal protein intake are widespread, but a low albumin in an unwell person is more often driven by inflammation than by diet alone.
- Nephrotic syndrome in children is a common paediatric presentation of low albumin with facial swelling and frothy urine.
Cost and insurance in India
A stand-alone serum albumin test is one of the less expensive biochemistry tests, and it is usually cheaper when bundled into a liver panel or metabolic panel than when ordered alone. Prices differ widely between government facilities, standalone laboratories and hospital-based laboratories, and between cities.
Factors that affect the price:
- Whether albumin is ordered alone or as part of an LFT, renal panel or health-check package.
- Type of facility: public hospital, standalone diagnostic lab, or hospital inpatient laboratory.
- City and locality.
- Home sample collection charges.
- Urgent or stat processing.
- Accreditation status of the laboratory.
- Repeat testing for monitoring over time.
Insurance: outpatient diagnostic tests are often not covered by standard indemnity health insurance unless the policy includes an OPD or diagnostic benefit. Tests performed during an admitted hospital stay are usually part of the hospitalisation claim. Some corporate and government schemes cover annual health checks. Confirm coverage with your insurer or the hospital's insurance desk before testing.
Myths and facts
| Myth | Fact |
|---|---|
| Low albumin means you are malnourished. | Inflammation and illness lower albumin independently of diet. Albumin is not a reliable nutrition marker. |
| Eating more protein or egg whites will raise albumin. | If inflammation, liver disease or protein loss is the cause, diet alone will not correct the level. The underlying cause must be addressed. |
| Normal albumin means the liver is fine. | Albumin can remain normal in acute hepatitis and early cirrhosis because of its long half-life. |
| Serum albumin checks the kidneys for protein leak. | Protein leak is measured in urine, using UACR. Serum albumin often stays normal in early kidney disease. |
| High albumin means excellent health. | Values above the range usually reflect dehydration or sample handling, not extra health. |
| An albumin infusion is the standard treatment for low albumin. | Albumin infusion is used in specific situations decided by the treating team, not as a routine correction for a low number. |
Frequently asked questions
Do I need to fast before an albumin test?
Fasting is usually not needed for serum albumin itself. Fasting may be requested when the same sample is used for glucose or lipids. Follow the instruction given by your laboratory. If you take insulin or sulfonylureas, check with your prescriber before fasting for any length of time.
How long does the whole process take?
The blood draw itself takes under a minute, and most people are in and out of the collection area within 10 to 20 minutes including registration and waiting. Reporting time depends on the laboratory and whether the test is bundled with others, so ask your collection centre.
What does a low albumin level mean for me?
Low albumin signals that something is affecting production, distribution or loss of protein. Causes include infection, inflammation, liver disease, kidney or bowel protein loss, and fluid overload. The result needs interpretation with your symptoms, examination and other tests. It does not by itself identify a diagnosis.
Can drinking more water lower my albumin reading?
Normal fluid intake mainly avoids the falsely raised readings caused by dehydration. Deliberately drinking large volumes is not advised, and is potentially harmful if you have heart failure, advanced kidney disease or a prescribed fluid restriction. Keep to your usual routine unless told otherwise.
Is the albumin test used to check kidney disease?
Not directly. Kidney screening uses urine albumin-to-creatinine ratio and eGFR. Serum albumin falls only when protein loss is substantial, as in nephrotic syndrome. A normal serum albumin does not exclude early kidney disease, particularly in people with diabetes or high blood pressure.
Can the albumin test detect cancer?
No. The albumin test is not a cancer test. Low albumin occurs in many cancers because of inflammation and illness, but it cannot detect or rule out cancer. Suspected blood cancers such as multiple myeloma require serum protein electrophoresis, free light chain testing and imaging.
Why does my report show an albumin-globulin ratio?
The A:G ratio is calculated from albumin and total protein. A reduced ratio can occur when albumin falls or globulins rise, as in chronic infection, autoimmune disease or paraproteinaemia. The ratio is a prompt for further testing, not a diagnosis. Your doctor decides whether any follow-up is needed.
Should I stop my medicines before the test?
Do not stop, start or change any prescribed medicine for a blood test. Instead, tell the laboratory and your doctor what you take, including steroids, hormone preparations, herbal and AYUSH products and supplements, so results can be read in context. Any medication change is a decision for your prescriber.
My albumin was normal but I still have swelling. What next?
Swelling has many causes beyond low albumin, including heart, kidney, thyroid, venous and medication-related causes. A normal albumin does not exclude these. Return to your doctor for examination and appropriate further tests rather than assuming the normal result settles the question.
Sources
- Rinella ME et al. Multi-society Delphi consensus statement on new fatty liver disease nomenclature. 2023 (nomenclature: SLD, MASLD, MASH, MetALD).
- Kidney Disease: Improving Global Outcomes (KDIGO) clinical practice guideline for the evaluation and management of chronic kidney disease (urine albumin-to-creatinine ratio for kidney assessment).
- European Association for the Study of the Liver clinical practice guidelines on decompensated cirrhosis and on the use of albumin in liver disease.
- American Association for Clinical Chemistry / laboratory medicine references on serum albumin assay methods (bromocresol green versus bromocresol purple).
- Global Leadership Initiative on Malnutrition (GLIM) criteria, which classify albumin as an inflammation marker rather than a nutritional indicator.
