What this test measures
Serum albumin is the most abundant protein in the blood, produced exclusively by the liver. It holds fluid inside blood vessels (oncotic pressure), transports drugs, hormones, fatty acids and calcium, and buffers pH. The half-life is about 21 days, so albumin levels change slowly — a low value reflects weeks-to-months of stress, not an acute event.
Labs measure albumin colorimetrically (bromocresol green or purple). It is reported alongside Total Protein and Globulin to give the Albumin/Globulin (A/G) ratio.
Why it matters
Low albumin in India is most often a marker of chronic liver disease (NAFLD-cirrhosis, hepatitis B/C cirrhosis), nephrotic syndrome (protein loss in urine — common in diabetes), chronic infections (TB, HIV), malabsorption, or undernutrition. It is a strong prognostic marker in cirrhosis (a key component of the Child-Pugh score) and in chronic kidney disease, heart failure and hospitalised patients.
In surgical and critical-care settings, albumin below 3.5 g/dL predicts poor wound healing, longer hospital stays and higher mortality. It is also one of the first labs to drop in protein-losing enteropathies and chronic inflammatory states.
How to prepare
No fasting required, though fasting is often requested when albumin is part of an LFT bundled with lipid or glucose tests. Sit for at least 5 minutes before sample collection — prolonged tourniquet time or standing can falsely raise albumin by 5–10%. Tell your doctor about any IV fluid in the past 24 hours (can dilute albumin).
Markers & reference ranges
Reference ranges below are typical adult values. Your lab's reported range may differ slightly based on the assay platform and patient demographics — always read your report against the range printed on it.
| Marker | Normal range | If low | If high |
|---|---|---|---|
| Albumin (g/dL)[1][2] | 3.5 – 5.2 | Low albumin (hypoalbuminaemia). Causes — chronic liver disease / cirrhosis, nephrotic syndrome (urine protein loss), protein-losing enteropathy, severe malnutrition, chronic inflammation (any major infection, autoimmune disease, malignancy), heart failure, burns. Levels below 2.5 g/dL cause oedema and ascites. In cirrhosis, albumin is one of the Child-Pugh score components used to grade disease severity. | High albumin almost always reflects dehydration (haemoconcentration) rather than true overproduction. Rare causes include very high-protein diet or anabolic steroid use. Correct hydration and recheck. |
How to interpret a low albumin
| Albumin (g/dL) | Clinical significance | Typical context | Next step |
|---|---|---|---|
| 3.5 – 5.2 | Normal | Healthy adult | No action |
| 3.0 – 3.4 | Mildly low | Acute illness, mild chronic disease, dehydration corrected | Repeat in 4–6 weeks; check LFT, urine protein |
| 2.5 – 2.9 | Moderately low | Chronic liver disease, nephrotic syndrome, chronic inflammation | Workup — LFT, urine ACR, inflammatory markers, nutrition assessment |
| < 2.5 | Severely low | Cirrhosis with ascites, severe nephrotic syndrome, sepsis, severe malnutrition | Hospital evaluation; oedema and ascites often present |
Frequently asked questions
Do I need to fast for an albumin test?
No — fasting is only needed if albumin is part of a panel with lipid or glucose tests.
What causes a low albumin?
The four big buckets are: liver disease (less production), kidney disease (urinary loss), gut disease (intestinal loss), and chronic inflammation / malnutrition (consumption + low intake). Mild dehydration can transiently raise it.
My albumin is 3.3 g/dL — should I worry?
A mildly low value often reflects a recent illness or mild chronic disease. Repeat in 4–6 weeks and look at the rest of your liver and kidney profile. If you have known liver or kidney disease, your doctor will use it to grade severity.
Can a high-protein diet raise serum albumin?
Not significantly. Serum albumin is a slow-turnover protein and dietary protein increases it only marginally. A "high" value almost always means dehydration.
Why is albumin used to grade cirrhosis?
Because albumin is made only by the liver and has a long half-life, it reflects the liver's sustained synthetic capacity. It is one of five components of the Child-Pugh score (with bilirubin, INR, ascites, and encephalopathy).
How does albumin differ from "total protein"?
Total protein is albumin plus globulins (immunoglobulins, transport proteins). Albumin is one specific protein. Checking both lets the lab calculate Globulin and the A/G ratio, which separates liver disease (low albumin) from chronic inflammation / myeloma (high globulin).
Can pregnancy lower albumin?
Yes. Plasma volume rises in pregnancy, diluting albumin — values 0.5–1.0 g/dL lower than non-pregnant are normal, especially in the third trimester.
Related Liver / Enzymes tests
Tests commonly ordered alongside ALBUMIN - SERUM, or that help interpret an unexpected result.
Sources & references
- NIH MedlinePlus — Albumin Blood Test · accessed 2026-05-30T00:00:00.000Z
- NCBI StatPearls — Hypoalbuminemia · accessed 2026-05-30T00:00:00.000Z
- AASLD Practice Guidance — Cirrhosis · accessed 2026-05-30T00:00:00.000Z
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