24-Hour Urine Collection Test: What It Measures, How to Collect, and Meaning
A 24-hour urine collection test measures the total amount of one or more substances excreted in urine during a complete day. Unlike a spot...
24-Hour Urine Copper Test: Wilson Disease, Copper Overload, and Liver Disease Evaluation
A 24-hour urine copper test measures the total amount of copper excreted in urine during one complete day. It is most often used when...
24-Hour Urine Cortisol Test: Adrenal Function, Cushing Syndrome Screening, and High Levels
A 24-hour urine cortisol test measures the amount of free cortisol excreted in urine over a full day. It is mainly used to look...
24-Hour Urine Creatinine Test: Collection Accuracy, Kidney Function, and Muscle Mass
A 24-hour urine creatinine test measures the total amount of creatinine excreted in urine over one full day. Creatinine is produced from normal creatine...
24-Hour Urine Heavy Metals Test: Toxic Exposure, Arsenic, Mercury, Lead, and Meaning
A 24-hour urine heavy metals test measures selected metals excreted over a full day, commonly including arsenic, cadmium, mercury, and lead. It can help...
24-Hour Urine Kidney Function Test: Creatinine, Protein, Electrolytes, and Filtration
A 24-hour urine kidney function test collects every urine sample over one full day so a laboratory can measure how much of selected substances...
24-Hour Urine Magnesium Test: Mineral Balance, Kidney Loss, and Stone Risk
A 24-hour urine magnesium test measures how much magnesium leaves the body in urine over one complete day. It is most useful when a...
24-Hour Urine Metanephrines Test: Pheochromocytoma Screening and Adrenal Tumor Evaluation
A 24-hour urine metanephrines test measures metanephrine and normetanephrine, breakdown products of the catecholamines epinephrine and norepinephrine. It is used mainly to look for...
24-Hour Urine Osmolality Test: Kidney Concentration, Fluid Balance, and Urine Output
A 24-hour urine osmolality test measures the average concentration of dissolved particles in urine collected over one full day. It reflects the relationship between...
24-Hour Urine Oxalate Test: Kidney Stone Risk and High Oxalate Meaning
A 24-hour urine oxalate test measures how much oxalate is excreted in urine during one complete day. It is most often used to evaluate...
24-Hour Urine Phosphorus Test: Mineral Balance, Kidney Function, and Bone Health
A 24-hour urine phosphorus test measures how much phosphorus, mainly present as phosphate, is excreted in urine over one complete day. It is used...
24-Hour Urine Potassium Test: Potassium Balance, Kidney Loss, and Meaning
A 24-hour urine potassium test measures how much potassium your kidneys remove in urine over a full day. It is most useful when a...
24-Hour Urine Protein Test: Proteinuria, Kidney Disease, and Collection Meaning
A 24-hour urine protein test measures the total amount of protein your kidneys release into urine during a full day. Healthy kidneys keep most...
24-Hour Urine Sodium Test: Salt Intake, Blood Pressure, Kidney Stones, and Meaning
A 24-hour urine sodium test measures how much sodium leaves your body in urine over a full day. Because most absorbed dietary sodium is...
24-Hour Urine Stone Risk Profile: Calcium, Oxalate, Citrate, Uric Acid, Sodium, and Volume
A 24-hour urine stone risk profile measures several urine factors that can either promote or prevent kidney stones. Instead of looking at one result...
24-Hour Urine Urea Nitrogen Test: Protein Intake, Kidney Function, and Nitrogen Balance
A 24-hour urine urea nitrogen test measures how much nitrogen from urea is excreted in urine over a full day. Urea is made in...
24-Hour Urine Uric Acid Test: Gout, Uric Acid Stones, and High Levels
A 24-hour urine uric acid test measures how much uric acid your kidneys excrete during a full day. Uric acid forms when the body...
24-Hour Urine Volume Test: Hydration, Kidney Stones, Polyuria, and Low Volume
A 24-hour urine volume test measures the total amount of urine produced in one full day. The result can answer several different clinical questions:...
Creatinine Clearance Test: 24-Hour Urine, Kidney Filtration, and Blood Creatinine
A creatinine clearance test estimates how much blood plasma the kidneys clear of creatinine each minute. It combines the creatinine concentration in urine, the...
Timed Urine Collection Test: 2-Hour, 12-Hour, 24-Hour Samples, and Collection Accuracy
A timed urine collection measures everything excreted in urine during a defined interval, such as 2 hours, 12 hours, or 24 hours. The test...