24-Hour Urine 5-HIAA Test: Carcinoid Syndrome, Serotonin Metabolism, and High Levels
A 24-hour urine 5-HIAA test measures how much 5-hydroxyindoleacetic acid is excreted in urine over a full day. 5-HIAA is the main breakdown product...
24-Hour Urine Albumin Test: Albuminuria, Kidney Damage, and CKD Evaluation
A 24-hour urine albumin test measures the total amount of albumin lost in urine over one complete day. Albumin is a major blood protein...
24-Hour Urine Amino Acids Test: Metabolic Disorders and Amino Acid Excretion
A 24-hour urine amino acids test measures how much of many individual amino acids are excreted over a full day. Amino acids are the...
24-Hour Urine Calcium Test: Kidney Stones, High Calcium, and Parathyroid Causes
A 24-hour urine calcium test measures the total amount of calcium excreted in urine during one complete day. It is commonly used in people...
24-Hour Urine Catecholamines Test: Adrenal Tumor Screening, Epinephrine, Norepinephrine, and Dopamine
A 24-hour urine catecholamines test measures the daily excretion of epinephrine, norepinephrine, dopamine, and sometimes related compounds. These chemicals act as hormones and neurotransmitters...
24-Hour Urine Chloride Test: Electrolyte Balance, Salt Intake, and Acid-Base Clues
A 24-hour urine chloride test measures the total amount of chloride excreted in urine over one full day. Chloride is a major electrolyte that...
24-Hour Urine Citrate Test: Low Citrate, Kidney Stone Risk, and Urine Chemistry
A 24-hour urine citrate test measures how much citrate is excreted over a full day, usually as part of a metabolic evaluation for kidney...
24-Hour Urine Collection Errors: Low Creatinine, Missed Samples, Overcollection, and Meaning
A 24-hour urine test can produce a precise-looking number even when the collection itself was incomplete. The most common errors are missed urine, wrong...
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...