Albumin test (blood) Biomarker Testing
An albumin test measures a key blood protein tied to liver, kidney, and nutrition status, with convenient Quest lab ordering through Vitals Vault.
With Vitals Vault, you have access to a comprehensive range of biomarker tests.
Albumin is one of the most abundant proteins in your blood. Your result can offer a quick snapshot of how well your body is making and maintaining key proteins, and it often moves when you are dehydrated, inflamed, or dealing with liver or kidney problems.
You will usually see albumin as part of a broader blood panel, such as a comprehensive metabolic panel (CMP). Because it is influenced by many everyday factors, the most useful way to read it is in context with your symptoms, other labs, and whether the value is changing over time.
If you are trying to make sense of a “low albumin” flag or you are monitoring a known condition, this page walks you through what the test measures, what low and high results can mean, and what other tests commonly come with it.
Do I need an Albumin test?
You might consider an albumin test if you have swelling in your legs or abdomen, unexplained fatigue, poor appetite, or ongoing digestive issues that make you wonder about nutrition or absorption. It is also commonly ordered when you have signs of liver disease (such as jaundice or abnormal liver enzymes) or kidney disease (such as foamy urine, swelling, or protein in the urine).
Albumin is frequently checked as part of routine health screening because it helps interpret other results. For example, it can change how you think about calcium levels, total protein, and the albumin-to-globulin (A/G) ratio.
If you are already being treated for a chronic condition—like cirrhosis, chronic kidney disease, inflammatory bowel disease, or heart failure—your clinician may use albumin to track severity, complications, or response to treatment.
Testing can support clinician-directed care, but an albumin result by itself does not diagnose a specific disease.
Albumin is measured on standard clinical chemistry analyzers in CLIA-certified laboratories; results should be interpreted with your overall clinical picture, not as a standalone diagnosis.
Lab testing
Ready to order albumin (often as part of a CMP) and test at a Quest location?
Schedule online, results typically within about a week
Clear reporting and optional clinician context
HSA/FSA eligible where applicable
Get this test with Vitals Vault
If you want to check albumin without waiting for a traditional office visit, Vitals Vault lets you order lab testing directly and complete your draw at a participating Quest location.
Albumin is most informative when it is paired with related markers (like liver enzymes, kidney markers, and total protein). You can start with a focused option or choose a broader panel so your result is easier to interpret.
After your results post, you can use PocketMD to review what your albumin level may suggest, what common follow-up tests to consider, and when it might make sense to recheck—especially if dehydration, recent illness, or medication changes could have influenced your number.
- Order online and draw at a Quest location
- Clear, plain-language result context in PocketMD
- Easy re-testing to confirm trends over time
Key benefits of Albumin testing
- Helps assess liver protein production when liver disease is a concern.
- Adds context to swelling (edema) by reflecting blood “oncotic pressure” support.
- Supports kidney evaluation when paired with urine protein testing and creatinine.
- Improves interpretation of total protein and the A/G ratio.
- Helps distinguish dehydration-related concentration from true low protein states.
- Can signal inflammation or chronic illness patterns when tracked over time.
- Works well as part of a CMP so you can interpret albumin alongside related markers in one draw.
What is Albumin?
Albumin is a protein made primarily by your liver and released into your bloodstream. It helps keep fluid inside your blood vessels by maintaining oncotic pressure, and it also acts as a carrier protein that transports hormones, fatty acids, bilirubin, and many medications.
Because albumin is influenced by production (mainly liver function), loss (often through kidneys or the gut), and dilution or concentration (your hydration status), it is a useful “big-picture” marker. However, it is not specific. A low value can happen for many reasons, including inflammation, infection, poor intake, malabsorption, kidney protein loss, or advanced liver disease.
Most lab reports list this as serum albumin, measured from a blood sample. Albumin is also a “negative acute-phase reactant,” which means it can drop during systemic inflammation even if your liver is capable of making it.
Albumin vs. total protein
Total protein includes albumin plus other proteins (often grouped as globulins). If total protein is normal but albumin is low, globulins may be relatively higher, which can happen with inflammation or certain immune conditions. If both are low, it can point more toward reduced intake/absorption, protein loss, or reduced production.
Albumin and fluid balance
When albumin is significantly low, fluid can shift out of blood vessels into tissues, contributing to swelling in the legs, around the eyes, or in the abdomen (ascites). Swelling has many causes, so albumin is one piece of the puzzle rather than the whole explanation.
Albumin and medication binding
Some medications bind to albumin in the bloodstream. If albumin is low, the “free” (active) fraction of certain drugs can be higher than expected, which is one reason clinicians may pay attention to albumin in complex care situations.
What do my Albumin results mean?
Low albumin levels
A low albumin result often means your body is not maintaining normal blood protein levels, either because production is reduced, losses are increased, or inflammation is suppressing albumin. Common patterns include chronic liver disease (reduced production), kidney disease with protein loss (especially nephrotic-range proteinuria), and chronic inflammation or infection. It can also be seen with poor protein intake, malabsorption, or significant illness that increases protein needs. If your value is low, it is usually worth reviewing it alongside total protein, liver enzymes, bilirubin, kidney markers, and urine testing for protein.
In-range (optimal) albumin levels
An in-range albumin result generally suggests you are maintaining normal circulating protein levels at the time of the test. It supports (but does not prove) adequate liver synthetic function and the absence of major ongoing protein loss. If you have symptoms like swelling or fatigue despite a normal albumin, your clinician will typically look for other causes such as heart, kidney, thyroid, or venous issues. Trending matters: a steady downward drift within the reference range can still be clinically meaningful in the right context.
High albumin levels
A high albumin result is most commonly due to dehydration or hemoconcentration, meaning the protein appears higher because there is less plasma water. It is less often caused by increased production, since the body tightly regulates albumin synthesis. If albumin is high, it is helpful to look at other signs of dehydration such as elevated sodium, higher blood urea nitrogen (BUN) relative to creatinine, or a history of low fluid intake, vomiting, diarrhea, or heavy sweating. Rehydration and repeat testing often normalize a mildly high value.
Factors that influence albumin
Hydration status is a major factor: dehydration can raise albumin, while fluid overload can lower it. Inflammation, infection, surgery, and acute illness can lower albumin even when nutrition is adequate. Kidney protein loss, gastrointestinal protein loss, burns, and severe skin conditions can also reduce albumin. Pregnancy and IV fluids may lower measured albumin due to dilution, and certain medications or lab timing (for example, testing during an acute flare of illness) can change how representative the number is of your baseline.
What’s included
- Albumin
Frequently Asked Questions
What is a normal albumin level?
Most labs report a reference range for serum albumin that is roughly in the mid-3 to mid-5 g/dL range, but the exact cutoffs vary by lab and method. Use the range printed on your report, and interpret it with your other labs and your clinical situation.
Do I need to fast for an albumin blood test?
Albumin itself does not usually require fasting. However, albumin is often ordered inside a comprehensive metabolic panel, and your clinician or the lab may recommend fasting because the panel can include glucose. Follow the instructions that came with your order.
What causes low albumin?
Low albumin can be caused by reduced production (such as advanced liver disease), increased loss (such as kidney disease with protein in the urine or protein-losing enteropathy), or inflammation and acute illness that suppress albumin levels. Poor intake or malabsorption can contribute, especially when combined with chronic disease.
What causes high albumin?
High albumin is most often a sign of dehydration or hemoconcentration rather than a disease that increases albumin production. If you were sick with vomiting or diarrhea, sweating heavily, or not drinking enough fluids, a repeat test after rehydration may be more representative.
Is albumin a liver function test?
Albumin is often grouped with liver-related labs because it reflects liver synthetic function (the liver’s ability to make proteins). It is best interpreted alongside other liver tests such as ALT, AST, alkaline phosphatase, and bilirubin, because albumin can also change due to kidney loss, inflammation, or hydration.
How is albumin different from urine microalbumin?
Serum albumin is the amount of albumin in your blood. Urine microalbumin (often reported as an albumin-to-creatinine ratio, ACR) looks for small amounts of albumin leaking into the urine, which can be an early sign of kidney damage, especially in diabetes or hypertension.
When should I recheck albumin?
That depends on why it was tested and whether the result was abnormal. If dehydration or a short-term illness may have affected your number, rechecking after recovery can be reasonable. If you have a chronic condition being monitored, your clinician may recheck on a schedule that matches your treatment plan and other labs.