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The main protein in the blood is called albumin. Albumin in trace amounts is normally present in the blood. On the other hand, if urine contains high levels of albumin and other blood proteins, it represents the condition called albuminuria, also known as proteinuria. In most cases albuminuria indicates kidney damage although there may be other causes.

Symptoms of Blood Protein in Urine

Initially, there are no symptoms of proteinuria when the body excretes small amounts of protein. Over time, as protein gets eliminated in larger amounts through the urine, first signs and symptoms start to appear. High levels of blood protein may result in cloudy or foamy appearance of the urine. Also, loss of large amounts of protein can cause signs of protein deficiency in the blood. This can cause inability of the blood to soak up sufficient fluids. Consequently, this leads to edema, the condition featured by fluid retention. Blood protein in urine commonly causes swelling of the hands, feet, abdomen and face.

Causes of Blood Protein in Urine

Blood protein present in urine can be caused by several conditions. Kidneys normally do not filter out protein from blood.

In case of glomerulonephritis, an inflammation of glomeruli, the filtering components of the kidneys that can cause blood protein to pass through the kidneys can result in blood protein in urine. This can indicate the onset of chronic kidney disease (CKD), which is the most common cause of blood protein in urine. Some infections can temporarily cause high levels of protein in urine, which resolves after the infection subsides. Also, physical or emotional stress can cause abnormal levels of blood protein in urine for the short term. Other possible causes of elevated levels of protein in urine include: high blood pressure, heart disease, diabetes, leukemia, lupus, sickle cell anemia, rheumatoid arthritis and Hodgkin’s lymphoma. Protein in urine is normally present in pregnancy. Use of certain medications can lead to blood protein in urine as well.

Tests for Blood Protein in Urine

Presence of protein in urine can be detected with the help of laboratory test called urinalysis. For urinalysis, a patient must collect a sample of his or her first morning urine in a sterile container and take it to a laboratory. The measurement of protein in urine is called protein creatinine ratio. Creatinine is a waste product of a normal muscle breakdown. If the urine contains over 30 milligrams of album per gram of creatinine it is a sign of a serious health problem such as declining kidney function. Degree of the kidney damage can be identified with additional diagnostic tests.
    

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