Albumin Test

What is albumin?

Albumin is a protein produced exclusively by the liver and accounts for about 60% of total plasma protein. It performs several vital functions: maintaining oncotic pressure (keeping fluid inside blood vessels), transporting hormones, drugs, fatty acids, bilirubin and ions through the blood, and acting as an antioxidant and buffer. Albumin has a half-life of about 20 days, making it a useful marker of nutritional and liver status over weeks, not days. It is measured as part of a liver function test (LFT) panel and in kidney (nephrotic syndrome) workup.

Albumin normal range

What does LOW albumin mean?

Why does low albumin cause swelling?

Albumin is the main protein maintaining oncotic pressure (the force that keeps fluid inside blood vessels). When albumin falls below about 2.5 g/dL, oncotic pressure drops and fluid leaks from the bloodstream into surrounding tissues, causing oedema (swelling in the legs, ankles, abdomen and around the eyes). This is pitting oedema and is one of the key physical findings in hypoalbuminaemia from any cause.

High albumin: what it means

High albumin (hyperalbuminaemia) is almost always due to dehydration, which concentrates the blood. It is treated by ensuring adequate fluid intake.

Questions to ask your doctor

• Is my low albumin from liver, kidney or nutritional causes?
• Should I have a urine protein test to check for nephrotic syndrome?
• Does this affect drug dosing (some drugs are albumin-bound)?
• Am I getting adequate protein in my diet?
• What is my liver's overall synthetic function?

Albumin vs total protein vs prealbumin: how they compare

Albumin rarely travels alone on a report — it sits inside the liver panel next to total protein, globulin and sometimes prealbumin. Each answers a different question:

No single one of these diagnoses anything on its own — doctors read the pattern across the panel.

Reading your report: what your doctor actually looks at

When a doctor opens an albumin result, the number itself is only the starting point. Here is the checklist they run through — and the same checklist helps you read your own report calmly:

1. Were you ill or inflamed on the day? Albumin is a negative acute-phase reactant: it falls during any infection or inflammation, regardless of nutrition. A low reading taken during a cold or flu is usually repeated once you are well.
2. What is the trend? A value drifting down across several reports matters far more than one borderline reading. Bring old reports so the trend is visible.
3. Were you dehydrated? Dehydration concentrates the blood and can falsely raise albumin, masking a genuinely low value. Mention how you felt on the day of the draw.
4. What do the companion numbers say? Low albumin with low total protein points one way; low albumin with high globulin points another — often toward chronic immune activity. The pattern across the panel is the real story.
5. What medicines do you take? Many drugs — warfarin and phenytoin are classic examples — travel in the blood bound to albumin. Low albumin means more free, active drug in circulation, so your doctor and pharmacist should know. Never adjust a dose yourself.

If your albumin is mildly low and you feel well, the usual next step is a recheck once the underlying picture is clearer — not a rush to change your diet. Discuss the full picture with your doctor.

Albumin test price in India: typical bands across major lab chains

Albumin is rarely ordered on its own — it usually arrives as part of a liver function test panel, which is the price worth comparing. Typical list-price bands:

These are approximate bands, not quotes: prices change often and vary by city, and home collection can add a small fee. Where possible, choose a NABL-accredited lab, and remember the reference range printed on your own report is the one that counts.

Frequently Asked Questions

Pharmacist's practical notes

Albumin looks like a nutrition test but usually behaves like a liver, kidney and inflammation marker. Because it falls during any inflammation and takes weeks to rebuild, a low value most often points at an underlying cause — liver disease, protein lost in urine, or chronic inflammation — rather than at what you ate last week. The useful question for your doctor is what is driving it down.

The medication angle is the one most often missed: several common drugs ride through the blood on albumin, and when albumin is low, more free, active drug circulates. If your albumin is low, ask your doctor or pharmacist for a medication review — and never change a dose yourself.

In India

Indian labs usually report albumin in g/dL, though some use g/L (multiply g/dL by 10 to convert). Because it is almost always part of a liver function panel, comparing panel prices — typically &rupee;500–&rupee;1,000 — matters more than the standalone albumin price of roughly &rupee;250–&rupee;500.

Where possible, choose a NABL-accredited lab. Reference ranges differ slightly between analysers, so the range printed on your own report is the one that rules.

References

Sources cited on this page. PubMed links open the original abstract.

1. Rothschild MA, Oratz M, Schreiber SS. Serum albumin. Hepatology. 1988;8(2):385–401. PMID 3281888 · doi:10.1002/hep.1840080234
2. Soeters PB, Wolfe RR, Shenkin A. Hypoalbuminemia: Pathogenesis and Clinical Significance. JPEN J Parenter Enteral Nutr. 2019;43(2):181–193. PMID 30288759 · doi:10.1002/jpen.1451
3. Kaku Y, Ookawara S, Miyazawa H, et al. Approximation of Corrected Calcium Concentrations in Advanced Chronic Kidney Disease Patients with or without Dialysis Therapy. Nephron Extra. 2015;5(2):39–49. PMID 26557841 · doi:10.1159/000437215

Albumin as a nutritional and inflammation marker

Albumin is produced by the liver and is the most abundant protein in blood plasma. It serves several critical functions: maintaining oncotic pressure (keeping fluid inside blood vessels), transporting hormones, fatty acids, calcium, and drugs, and acting as a buffer. Because albumin has a half-life of 20 days, serum albumin reflects average protein synthesis and nutritional status over the preceding 3–4 weeks, unlike shorter-lived proteins such as prealbumin (half-life 2 days) which reflect more acute nutritional changes.

However, albumin is also a negative acute-phase reactant: during inflammation, infection, surgery, or trauma, the liver redirects amino acids toward producing acute-phase proteins (CRP, fibrinogen, ferritin) and decreases albumin synthesis. Additionally, inflammation increases vascular permeability, redistributing albumin out of the bloodstream. This means a low albumin in an acutely unwell patient may primarily reflect inflammation rather than malnutrition, always interpret albumin alongside CRP and other inflammatory markers.

Hypoalbuminaemia, the clinical consequences

When serum albumin falls below 30 g/L, the reduced oncotic pressure causes fluid to leak from the vascular compartment into the interstitium, producing oedema, ascites (fluid in the abdomen), and pleural effusions. This is particularly important in: nephrotic syndrome (albumin lost in the urine), liver cirrhosis (reduced synthesis), protein-losing enteropathy, and severe malnutrition.² Low albumin also has practical consequences for drug dosing, many drugs (warfarin, phenytoin, calcium channel blockers) are heavily albumin-bound, and hypoalbuminaemia means a higher proportion of free (active) drug, increasing both effect and toxicity risk.

Adjusted calcium, why albumin changes the calcium result

Approximately 45% of serum calcium is bound to albumin. Standard total calcium measurements include both bound and free (ionised) calcium. When albumin is low, total calcium appears falsely low even though ionised (physiologically active) calcium may be normal. For every 1 g/L fall in albumin below 40 g/L, add 0.02 mmol/L to the total calcium to obtain the "corrected calcium," a rearrangement of Payne's formula into SI units.³ Most laboratories automatically report corrected calcium alongside total calcium to prevent this misinterpretation, though the formula becomes less reliable in advanced chronic kidney disease, where it can both over- and under-correct.³ Direct ionised calcium measurement (on arterial blood gas or specific analysers) avoids this adjustment and is preferred in critically ill patients and in advanced CKD, where acid-base status and reduced formula accuracy both affect calcium interpretation.