Browsing tag

Sodium

Ask the intern

An interesting case was reported in Nephrology this month that highlights the importance of questioning whether or not a lab result is true. This is a very important skill for all internists but particularly nephrologists who are dependent…

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X-Files

A patient was recently seen on the consult service for evaluation of hyponatremia. She had a history of multiple myeloma and a previous bone marrow transplant and had significant cholestatic liver dysfunction related to GVHD. Her serum sodium at…

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Water deprived

Recently in the clinic we were asked to review a patient with suspected diabetes inspidus. She had been taking lithium for more than 20 years for bipolar disorder that was very well controlled. During a routine medical examination,…

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The Brinicle

The normal saline we use in the hospital contains 9 grams of sodium chloride per liter of water. If you look on the bag you will see 0.9% which is the mass concentration expressed as g/dl (0.9 grams…

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Fractional Excretion

The fractional excretion of sodium (FeNa) is a test that is often used in the setting of acute renal failure to help distinguish between pre-renal and intra-renal causes that has been mentioned in previous blog posts. In general,…

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A spoonful of sugar…

Cholera epidemics have been a major public health issue throughout recorded history and much energy was devoted towards preventing them and treating affected patients once they occurred. However, it was not until 1831 that it was recognized that…

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