Doctor insights on:
24 Hour Urine Calculation
Urine is the product of the kidneys, which is produced to eliminate the waste products of metabolism, manage body fluid balance, &maintain acid-base balance. The blood is first filtered by the kidneys, and the composition of the resulting fluid is then altered depending on the body's needs. It is composed of mostly water, and breakdown products from blood cells impart ...Read more
Diagnostic test: A 24-hour urine collection is a simple diagnostic procedure that measures the components of urine. The test is noninvasive (the skin is not pierced), and is used to assess kidney (renal) function. Specifically the amount of creatinine excreted is measured to get an estimate of the glomerular filtration rate (gfr). ...Read moreSee 1 more doctor answer
Tell kidney function: Single urine specimens can be tested for creatinine. But daily urine output and urinary concentration varies hence a 24 hr urine collection. Normal creatinine output for an adult should be >1gm/24 hours. Also getting blood creatinine provides optimal way to accurately determine creatine clearance which in turn is a most accurate way to measure kidney function. ...Read moreSee 1 more doctor answer
Different chemicals: A 24 urine is not a test per se. Many chemicals in urine need to be measured over a period of 24 hours. Common tests are for creatinine, calcium, adrenal hormones, albumin and protein in general. See this site for proper collection of specimen and the tests. http://www.urmc.rochester.edu/encyclopedia/content.aspx?ContentTypeID=92&ContentID=P08955 ...Read moreSee 1 more doctor answer
Good question: The creatinine is used to assess the quality of the collection. Based on your weight, body composition, and being a female you should have a certain amount of creatinine in your collection. If the amount in the specimen is above or below this amount, then it helps the physician to determine the collection was really 24hrs worth. ...Read more
Likely no problem.: Your creatinine is within normal range (< 1.5 mg/dl). Normal ranges can vary, but this is well within many. Your 24 urine was normal, which likely means your kidneys are working properly and you likely don't have any diseases, like diabetes, etc. That cause abnormal amounts of urine to be produced. ...Read more
For a 24 hour urine test, is one supposed to collect ALL the urine in those 24 hours or just a little bit every time we go?
24 hour urine catecholamine for a pheo- if a person does not have an episode during the 24 hours would it still show elevated levels. If so how?
Usually, yes: A pheo usually secretes catecholamines continuously, so it is not usually necessary to time the collection. These catecholamines yield a lot of breakdown products (eg. metanephrines). However, in some circumstances, if there is a very high suspicion for pheo and the initial tests are negative, and the attacks are sporadic, a urine collection timed with the episode is reasonable. ...Read more
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