This test measures the amount of protein in your urine.
Healthy kidneys usually filter protein out of the blood and absorb the protein. Then they send it back into the blood while waste material is passed out of your body as urine. But when your kidneys aren't working the way they should, protein may pass into your urine. Protein in your urine is a condition called proteinuria, albuminuria, or microalbuminuria.
Many different chronic diseases, including kidney disease and diabetes, can cause protein in your urine. During pregnancy, protein in your urine can mean a very dangerous condition called preeclampsia, or extremely high blood pressure.
You may have this test after a dipstick urine protein test. That test needs only one urine sample that's collected at your healthcare provider's office.