Name a common electrolyte disorder that occurs when the amount of sodium in your blood becomes abnormally low.

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1. A low blood sodium level is called hyponatremia.

2. Clinically, hyponatremia is defined as serum sodium less than $135\ \mathrm{mEq/L}$ (i.e. $	ext{Na}^+<135\ \mathrm{mEq/L}$).

3. Match choices: (1) Hyperkalemia = high potassium, (2) Hypokalemia = low potassium, (3) Hyponatremia = low sodium, (4) Hypernatremia = high sodium. Thus the correct option is (3), which corresponds to letter c.

FINAL_ANSWER: c

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