What is a serum albumin test? The serum albumin test measures the amount of albumin in the liquid part of your blood (serum). Albumin is a crucial protein made by your liver that helps transport hormones, vitamins, and other substances throughout your body. It also plays a vital role in maintaining proper fluid balance between your blood vessels and surrounding tissues. How is the test performed? A healthcare professional will draw a small sample of blood from a vein in your arm using a needle. The sample is then sent to a laboratory, where it is mixed with a blue-green dye called bromocresol green (BCG). The albumin in your blood binds to this dye, creating a color change that can be measured. The intensity of the color corresponds to the amount of albumin in your sample. Why might I need this test? Your doctor may order this test to check how well your liver is functioning, evaluate your nutritional status, or help diagnose certain medical conditions. It is often included in a comprehensive metabolic panel or a liver function panel. The test may be recommended if you have symptoms such as swelling in your legs or abdomen, unexplained fatigue, or signs of malnutrition. How should I prepare for this test? This test typically does not require fasting unless your doctor instructs otherwise. It is important to tell your healthcare provider about all medications and supplements you are taking, since some drugs can affect albumin levels. Follow any specific instructions given by your doctor or the testing facility. What do the results mean? Normal albumin levels vary slightly between laboratories but generally range from 3.5 to 5.0 grams per deciliter (g/dL). Low albumin levels may indicate liver disease, kidney disease, malnutrition, inflammation, or certain digestive disorders. High albumin levels are less common and may suggest dehydration. Your doctor will interpret your results based on your overall health and other test findings. Is the albumin test painful? You may feel a brief sting or pinch when the needle is inserted to draw your blood. This is typically well tolerated and lasts only a few seconds. Some people may notice minor bruising at the needle site afterward. How long does it take to get results? Results are usually available within a few hours to one day, depending on the laboratory. Your healthcare provider will contact you with the results or discuss them at your follow-up appointment. Can I eat or drink before the test? In most cases, you can eat and drink normally before a serum albumin test. However, follow any specific instructions from your doctor, since other tests ordered at the same time may require fasting. What happens if my albumin levels are abnormal? Abnormal albumin levels alone do not provide a definitive diagnosis. Your doctor will consider your symptoms, medical history, and the results of other tests to determine the cause. Additional testing may be needed to identify the underlying condition. Are there any risks associated with this test? The risks are minimal and similar to those of any standard blood draw. They may include slight bleeding, bruising, or infection at the needle site. Serious complications are very rare.

A simple blood test that measures the amount of albumin, a key protein made by your liver, in order to evaluate how well your liver is working, assess your kidney health, and determine your overall nutritional status.