Hyponatremia laboratory findings: Difference between revisions
| Line 68: | Line 68: | ||
|< 275 mOsm/kg | |< 275 mOsm/kg | ||
|> 100 mOsm/kg | |> 100 mOsm/kg | ||
|'''U<sub>Na</sub> > 20 mEq/L | |'''U<sub>Na</sub> > 20 mEq/L:''' | ||
* Acute or chronic renal failure | * Acute or chronic renal failure | ||
| Line 74: | Line 74: | ||
* Psychogenic polydipsia | * Psychogenic polydipsia | ||
* [[Diuretic]] use in: [[Heart failure]] [[Liver disease|, Liver disease]], [[Nephrotic syndrome]] | * [[Diuretic]] use in: [[Heart failure]] [[Liver disease|, Liver disease]], [[Nephrotic syndrome]] | ||
'''U<sub>Na</sub> < 20 mEq/L | '''U<sub>Na</sub> < 20 mEq/L:''' | ||
* Heart failure | * Heart failure | ||
| Line 86: | Line 86: | ||
|< 275 mOsm/kg | |< 275 mOsm/kg | ||
|> 100 mOsm/kg | |> 100 mOsm/kg | ||
|'''Variable U<sub>Na | |'''Variable U<sub>Na</sub>''' ''':''' | ||
* SIADH/SIAD | * SIADH/SIAD | ||
'''U<sub>Na</sub> > 40 mEq/L:''' | '''U<sub>Na</sub> > 40 mEq/L:''' | ||
| Line 117: | Line 117: | ||
** Small bowel obstruction | ** Small bowel obstruction | ||
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==References== | ==References== | ||
Revision as of 08:41, 29 May 2018
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Hyponatremia Microchapters |
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Diagnosis |
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Treatment |
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Case Studies |
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Hyponatremia laboratory findings On the Web |
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American Roentgen Ray Society Images of Hyponatremia laboratory findings |
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Risk calculators and risk factors for Hyponatremia laboratory findings |
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Saeedeh Kowsarnia M.D.[2]
Overview
An elevated/reduced concentration of serum/blood/urinary/CSF/other [lab test] is diagnostic of [disease name].
OR
Laboratory findings consistent with the diagnosis of [disease name] include [abnormal test 1], [abnormal test 2], and [abnormal test 3].
OR
[Test] is usually normal among patients with [disease name].
OR
Some patients with [disease name] may have elevated/reduced concentration of [test], which is usually suggestive of [progression/complication].
OR
There are no diagnostic laboratory findings associated with [disease name].
Laboratory Findings
Biochemical evaluation for finding the etiologies of hyponatremia :
For different causes of hyponatremia, click here.
For approach to differential diagnosis, click here.
For the clinical approach to diagnosis, click here.
| Conditions | Sodium status | Plasma osmolality | Urine osmolality | Differentiation of causes |
|---|---|---|---|---|
| Hypervolemic hyponatremia | TBW ↑↑
Serum Na ↑ |
< 275 mOsm/kg | > 100 mOsm/kg | UNa > 20 mEq/L:
UNa < 20 mEq/L:
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| Euvolemic hyponatremia | TBW ↑
Serum Na ↔ |
< 275 mOsm/kg | > 100 mOsm/kg | Variable UNa :
UNa > 40 mEq/L:
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| Hypovolemic hyponatremia | TBW ↔
Serum Na ↓↓ |
< 275 mOsm/kg | > 500 mOsm/kg | UNa > 30 mEq/L:
UNa < 30 mEq/L:
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