Ringer's lactate solution contains all of the following constituents, EXCEPT?

Appeared in: DSSSB -28 August 2019 (Shift-2)

Explanation

Ringer's Lactate (RL), also known as Hartmann's solution, is a balanced, isotonic crystalloid solution.
The standard formulation of Ringer's Lactate does not contain glucose.
Its primary constituents are water and electrolytes, including sodium, potassium, chloride, calcium, and lactate.
Intravenous solutions that contain glucose along with Ringer's Lactate are distinct formulations, such as Dextrose 5% in Lactated Ringer's (D5LR).

Option A: Chloride (Cl⁻) is a major anion present in Ringer's Lactate solution, typically at a concentration of about 109-111 mEq/L.
Option B: Sodium (Na⁺) is the primary cation in Ringer's Lactate, with a concentration of approximately 130-131 mEq/L, which makes the solution isotonic.
Option C: Potassium (K⁺) is an important electrolyte included in Ringer's Lactate at a concentration (4-5 mEq/L) that is similar to the normal physiological level in plasma.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Composition of Intravenous Fluids as background academic context rather than a clinical decision trigger.
Ringer's Lactate is a first-line fluid for resuscitation in patients with hypovolemia due to dehydration, surgery, burns, or gastrointestinal fluid loss.
The lactate in the solution is metabolized by the liver into bicarbonate, which helps to buffer metabolic acidosis. This makes it a more 'balanced' solution compared to Normal Saline, which can cause hyperchloremic metabolic acidosis in large volumes.
What if? If the patient had severe liver failure, Ringer's Lactate would be contraindicated or used with extreme caution. The failing liver cannot metabolize lactate, leading to its accumulation and worsening acidosis. In such a case, Normal Saline or another crystalloid might be preferred.

How to Approach the Question

First, recognize that this is a factual recall question with a negative framing, indicated by the word 'EXCEPT'.
The goal is to identify the one substance listed that is NOT a component of standard Ringer's Lactate solution.
Recall the composition of Ringer's Lactate (also known as Hartmann's solution). The key components are Sodium, Potassium, Calcium, Chloride, and Lactate.
Evaluate each option against this list.
Chloride is a component.
Sodium is a component.

Concept Tested & Keywords

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