Ouli Maty
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A patient has a serum Na of 129 and a serum glucose of 410.
Can the glucose level explain the hyponatremia when no other cause is found?
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| meg
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yes I think it can happen in hyperglycemia. Water shifts from ICF to ECF and dilutes the sodium. Although total body and total body sodium are normal , the dilution effect causes hyponatremia.
Meg
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| usmleasr
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yes it is pseudo hyponatremia as in SIADH (dilutional ) i agree with meg..
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| zaki
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while hyperglycemia above 200 will cause pseudohyponatremia
for every 100mg/dl above 200 will casue 1.6meq/l decrease of sodium
if wee add 3.2 to 129 it give us actual sodium level which is 132.9 is htat the normal level, i don't think so
plz comment on it
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Maverick
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| Ouli Maty
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Zaki, I agree with all the figures except that Glu has to be 200 for the formula. From what I have learned, it has to be just above normal which is around 100- 120. Can you explain why it is glu above 200.
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| bakpity
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Regarding to the debate in case of glucose level do these normal values apply for venous, arterial or capillary samples.
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| Ouli Maty
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hum :roll: :?:
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| meg
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while measuring blood glucose, we generally either measure venous (antecubital vein)or capillary (most commercial glucometers)
Apart from arterial blood gas analysis and say pulmonary artery blood parameters, I cannot think of arterial blood being used clinically for tests... are there?
Meg
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| peekay
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in lab majority of the time electrolytes are from venous blood. GLucsoe above 200 start interfering with the assays, so thats why there has to be a correction of sodium for glucose above 200. i hope i clarified the reason for correction.
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