![]() ![]() The test can be ordered as an urgent request. The in-lab turnaround time is normally less than 24 hours. Low urine sodium (<20 mEq/L) suggests: Hypovolemic hyponatremia due to extra-renal volume loss. The assays are run throughout the day and night. Production of large volumes of dilute urine is often a sign that the sodium is about to over-correct. The labelling of the request form and the sample must conform to the Policy for Specimen and Request Form Labelling for Pathology Users Turnaround times 24 hour urine colelctions should clearly state start and finish dates and times of collection. Relevant clinical details including medication, fluid replacement. Urine samples can be stored refrigerated overnight if clinically appropriate and unavoidable. Send at ambient temperature to the laboratory as soon as possible (no greater than 8 hours). ![]() Please list the tests of particular interest so that some priority can be given to analysis if plasma volumes are small.įor 24 hour urine sodium, urine should be collected into a brown 3L urine bottleįor random urine sodium, send in a plain white top narrow tubeĭo not store blood samples. Sample requirementsįor adults, blood taken into a 5mL gold top gel tube (or rust top for the Acute Unit)įor children, blood taken into a 3.5mL rust top gel tubeįor neonates, blood taken into a 0.8mL minicollect lithium heparin tube. 1 4 However, in the real world, most physicians only order the urine sodium and then start intravenous fluids to correct hyponatremia once patients are noted to. It helps your body regulate how much fluid it retains. A small amount of literature suggests that the use of complex indices would be helpful to distinguish SIADH patients from others (e.g., combined use of fractional excretion of sodium and fractional excretion of urea). Get Started Sodium is an important electrolyte (a mineral in your blood and other bodily fluids) that helps your body and cells function. Sodium forms part of the standard U&E (urea and electrolyte) panel in blood and can also be assayed in urine. Interpret your laboratory results instantly with us. ![]()
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