Albumin — Serum


Albumin is a protein made by the liver. A serum albumin test measures the amount of this protein in the clear liquid portion of the blood.

Albumin can also be measured in the urine.

How the Test is Performed

A blood sample is needed.

How to Prepare for the Test

The health care provider may tell you to temporarily stop taking certain medicines that can affect the test. Drugs that can increase albumin levels include:

Do not stop taking any of your medicines without talking to your provider first.

How the Test will Feel

When the needle is inserted to draw blood, some people feel moderate pain. Others feel only a prick or stinging. Afterward, there may be some throbbing or a slight bruise. This soon goes away.

Why the Test is Performed

Albumin helps move many small molecules through the blood, including bilirubin, calcium, progesterone, and medicines. It plays an important role in keeping the fluid in the blood from leaking into the tissues.

This test can help determine if you have liver disease or kidney disease, or if your body is not absorbing enough protein.

Normal Results

The normal range is 3.4 to 5.4 g/dL (34 to 54 g/L).

Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or test different samples. Talk to your provider about the meaning of your specific test results.

What Abnormal Results Mean

Lower-than-normal level of serum albumin may be a sign of:

  • Kidney diseases
  • Liver disease (for example, hepatitis, or cirrhosis that may cause ascites)

Decreased blood albumin may occur when your body does not get or absorb enough nutrients, such as with:

  • After weight-loss surgery
  • Crohn disease (inflammation of the digestive tract)
  • Low-protein diets
  • Celiac disease (damage of the lining of the small intestine due to eating gluten)
  • Whipple disease (condition that prevents the small intestine from allowing nutrients to pass into the rest of the body)

Increased blood albumin may be due to:

  • Dehydration
  • High protein diet
  • Having a tourniquet on for a long time when giving a blood sample

Drinking too much water (water intoxication) may also cause abnormal albumin results. 

Other conditions for which the test may be performed:

  • Burns (widespread)
  • Wilson disease (condition in which there is too much copper in the body)


There is very little risk involved with having your blood taken. Veins and arteries vary in size from one person to another, and from one side of the body to the other. Taking blood from some people may be more difficult than from others.

Other risks associated with having blood drawn are slight, but may include:

  • Bleeding from where the needle was inserted
  • Fainting or feeling lightheaded
  • Hematoma (blood collecting under the skin)
  • Infection (rare)


If you are receiving large amounts of intravenous fluids, the results of this test may be inaccurate.

Albumin will be decreased during pregnancy.


Chernecky CC, Berger BJ. Albumin - serum, urine, and 24-hour urine. In: Chernecky CC, Berger BJ, eds. Laboratory Tests and Diagnostic Procedures. 6th ed. St Louis, MO: Elsevier; 2013:110-112.

McPherson RA. Specific proteins. In: McPherson RA, Pincus MR, eds. Henry's Clinical Diagnosis and Management by Laboratory Methods. 23rd ed. St Louis, MO: Elsevier; 2017:chap 19.

Review Date: 2/13/2017

The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed physician should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. Copyright ©2017 A.D.A.M., Inc., as modified by University of California San Francisco. Any duplication or distribution of the information contained herein is strictly prohibited.

Information developed by A.D.A.M., Inc. regarding tests and test results may not directly correspond with information provided by UCSF Medical Center. Please discuss with your doctor any questions or concerns you may have.