Peptide Mass Measurement (24-Hour Urine Collection)

What This Test Measures

Peptides are small protein fragments that your body naturally breaks down. This test quantifies the total mass of these fragments in your urine, which can reflect how well your kidneys filter waste products from your blood. It’s particularly useful for detecting early signs of kidney problems, including conditions like chronic kidney disease or nephrotic syndrome.

Why It Might Be Ordered

Your healthcare provider may recommend this test if you have symptoms like swelling, frequent urination, or unexplained protein in your urine. It can also be used to monitor kidney function in people with diabetes, high blood pressure, or other risk factors for kidney disease.

Sample Collection and Preparation

You’ll need to collect all urine for a full 24-hour period, typically starting after you wake up and ending just before you wake up the next morning. Empty your bladder at the start and end of the collection period, then collect every urine void. Store the urine in a refrigerator or at room temperature, keeping it cold if possible, and return it to your lab within the specified timeframe.

How the Test Works

The urine sample is analyzed using a specialized technique called mass spectrometry, which measures the mass of peptides in precise detail. This method helps identify and quantify the breakdown products of proteins, providing insights into kidney function and potential abnormalities.