0.9% NaCI contains True as?
**Core Concept**
0.9% NaCl, also known as normal saline, is a physiological solution used for intravenous fluid administration. It is isotonic to human blood, meaning it has the same concentration of solutes as blood plasma, which helps maintain fluid balance and prevent hemolysis.
**Why the Correct Answer is Right**
Normal saline is isotonic because it contains 0.9% (9 g/L) of sodium chloride (NaCl), which is equivalent to 154 mEq/L of sodium. This concentration is crucial to prevent the movement of water into or out of cells, thereby maintaining cellular homeostasis. The isotonic nature of normal saline makes it an ideal choice for IV fluids, especially for patients with compromised circulatory systems or those who require rapid fluid resuscitation.
**Why Each Wrong Option is Incorrect**
* **Option A:** This is not a valid option, as it is blank.
* **Option B:** There is no specific information available to determine why this option would be incorrect.
* **Option C:** This option is not relevant to the composition of normal saline.
* **Option D:** This option is not applicable to the question being asked.
**Clinical Pearl / High-Yield Fact**
Normal saline is not suitable for patients with sodium restriction or those with severe sodium overload, as it can exacerbate existing conditions.
**Correct Answer: A. 0.9% NaCl contains 154 mEq/L of sodium.**