SODIUM, 24 HOUR URINE

Code
500.1300
Name
SODIUM, 24 HOUR URINE
Category
None
Department
Chemistry
Start Date
Expiration Date
Synonyms
Na
CPT Codes
84300, 81050
Site
Main Lab
Reference Test
ATLAS Test Code

Specimen Information

Type

Urine, 24 Hour

Volume

5.0 ml

Transport Info

Room Temperature
14 day stability

Refrigerated
14 day stability

Frozen (Freeze Only once)
stable

Fasting Required?
False
Patient Instructions

Reference Range

See Report

Methodology

Ion-selective Electrode (ISE)

Clinical Significance

Used in the diagnosis and treatment of aldosteronism (excessive secretion of the hormone aldosterone), diabetes insipidus (chronic excretion of large amounts of dilute urine, accompanied by extreme thirst), adrenal hypertension, Addison's disease (caused by destruction of the adrenal glands), dehydration, inappropriate antidiuretic hormone secretion, or other disease involving electrolyte imbalance.

In cases of hyponatremia, urine sodium < 10 mEq/L may indicate extrarenal depletion: dehydration (gastrointestinal or sweat loss), congestive heart failure, liver disease or nephrotic syndromes, and prerenal azotemia. Urine sodium > 10 mEq/L may indicate diuretics, emesis, intrinsic renal diseases, Addison’s disease, hypothyroidism, or syndrome of inappropriate antidiuretic hormone (SIADH). In hypothyroidism and in SIADH, sodium and chloride may be >40 mEq/L. In SIADH, urinary sodium usually is >20 mEq/L.

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