Discussion
The normal levels for plasma sodium ranges from ______ mmol/L and for potassium ______ mmol/L.
Answer: C
The normal ranges are 136-145 mmol/L for sodium and 3.5-5.0 mmol/L for potassium.
Sodium is the main cation outside the cells and potassium the main cation inside them. A sodium level below about 135 mmol/L is hyponatraemia, and a potassium level below about 3.5 mmol/L is hypokalaemia; both can cause weakness, confusion and heart rhythm problems.
The ranges 116-125 and 126-135 are hyponatraemic, and 146-155 is hypernatraemic. The potassium ranges paired with them are likewise off the normal mark.
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