Normal sodium level in blood is

Appeared in: NCL (MP) Nursing Officer - 2020

Explanation

The normal physiological range for serum sodium concentration is 135 to 145 mEq/L.
Sodium is the most abundant cation in the extracellular fluid (ECF) and is the primary determinant of ECF volume and osmolality.
It plays a vital role in maintaining water distribution, transmitting nerve impulses, and facilitating muscle contraction.

Option A: This range (50-100 mEq/L) represents severe to profound hyponatremia (low sodium).
Option B: This range (100-120 mEq/L) indicates moderate to severe hyponatremia.
Option D: This range (160-200 mEq/L) signifies moderate to severe hypernatremia (high sodium).

Clinical Relevance

Nursing practice connection: Knowing Normal laboratory value for serum sodium helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Nurses must carefully monitor sodium levels in at-risk patients, such as those on diuretics, with heart or kidney failure, or receiving IV fluids.
A critical patient-safety principle is the slow correction of sodium imbalances (no more than 12 mEq/L in 24 hours) to prevent severe neurological complications like osmotic demyelination syndrome or cerebral edema.
What if? If a patient presents with confusion and a sodium level of 118 mEq/L, the nurse's first action is to implement seizure precautions and prepare for the potential administration of hypertonic saline in an ICU setting, as this is a medical emergency.

How to Approach the Question

This is a factual recall question that tests knowledge of standard laboratory values.
Identify the key term in the question: 'Normal sodium level'.
Access your memory of common electrolyte ranges learned in fundamentals of nursing.
The standard physiological range for serum sodium is 135-145 mEq/L.
Scan the options provided and select the one that matches this known normal range.
Eliminate the other options as they represent critically low (hyponatremia) or critically high (hypernatremia) values.

Concept Tested & Keywords

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E6 Nursing Fundamentals Potter Perry 12e Part 5 p. 47-49

E6 Nursing Brunner Adult Health 3SA Vol 1 Part 1 p. 146-148

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