Electrolyte Disorders PNLE Questions

Introduction

The live inventory contains 23 original PNLE-style practice questions on Electrolyte Disorders. The topic belongs to NP4, Medical-Surgical, and covers sodium, potassium, calcium, magnesium, and phosphate imbalances with nursing actions. Use the questions to connect an electrolyte pattern with neurologic, neuromuscular, or cardiac cues, identify the priority assessment, select a safe action, and evaluate the client’s response.

The canonical boundary matters. Acid-base interpretation and renal replacement therapy are excluded, so keep an electrolyte question centered on the named imbalance, assessment findings, prescribed treatment, monitoring, and teaching. Adjacent topics may explain why a client is at risk, but they should not replace the electrolyte decision being tested.

Tangerine uses this topic as a pedagogical lens across relevant competencies in the official five-subject PNLE TOS, not as a separate official test subject. The 2025 Enhanced TOS assigns weights to broad competency areas rather than a guaranteed microtopic count. Use the 23-question set to diagnose and strengthen decisions while recognizing that exact microtopic distribution varies by exam form.

Key concepts

Sodium and neurologic safety
Recognize: Hyponatremia can present with headache, confusion, or seizures, while hypernatremia can produce thirst, neurologic irritability, and altered mental status. The trend and the client’s neurologic findings add meaning to the result.
Decide: Prioritize neurologic assessment, seizure or fall precautions when indicated, ordered therapy, and reassessment. Escalate a new neurologic change promptly.
Avoid: Treating the number alone or correcting sodium rapidly without the prescribed plan and monitoring.
Potassium and cardiac risk
Recognize: Hypokalemia may cause weakness and dysrhythmia risk; hyperkalemia can produce cardiac and neuromuscular changes. Medication history, recent losses, replacement, and cardiac findings help establish urgency.
Decide: Assess circulation and cardiac status, obtain ordered ECG or monitoring, verify the prescribed route and administration safeguards, and escalate concerning findings.
Avoid: Giving potassium from an unverified order, treating severe hyperkalemia as a diet-teaching problem first, or assuming a single result explains the whole risk.
Calcium and neuromuscular irritability
Recognize: Facial twitching during Chvostek testing is a cue for neuromuscular irritability associated with low calcium, but a sign must be interpreted with the complete assessment. Tingling, cramps, or spasms can increase concern.
Decide: Assess airway, muscle activity, neurologic status, and cardiac status as indicated, then carry out prescribed calcium management and monitoring.
Avoid: Calling the sign a definitive diagnosis or delaying escalation when muscle spasm or airway compromise is developing.
Magnesium as a coexisting imbalance
Recognize: Low magnesium may accompany or sustain hypokalemia and may contribute to neuromuscular irritability and dysrhythmia risk. Persistent hypokalemia despite replacement is a cue to review magnesium and other ongoing losses.
Decide: Review the full electrolyte pattern, medication and loss history, ordered replacement, and response to treatment. Monitor for cardiac or neuromuscular deterioration.
Avoid: Repeating potassium replacement without investigating a coexisting magnesium problem or ignoring the prescribed monitoring plan.
Phosphate and functional weakness
Recognize: Severe hypophosphatemia can present with marked muscle weakness. Interpret phosphate findings alongside nutrition, clinical condition, associated electrolyte changes, and the direction of the trend.
Decide: Assess mobility, respiratory effort, swallowing, or functional ability as relevant to the presentation. Report significant deterioration and administer prescribed management safely.
Avoid: Assuming weakness is only fatigue or choosing replacement based on a laboratory result without assessment and an order.
Priority, cause, and response
Recognize: Electrolyte questions may combine a laboratory result with losses, burns, medications, diet, or a treatment that changes serum distribution. The most urgent cue may be neurologic decline, cardiac instability, or rapidly worsening weakness.
Decide: Use airway, breathing, circulation, neurologic status, focused history, trend review, and reassessment to sequence actions. Teach diet or medication precautions after immediate instability is addressed.
Avoid: Jumping to education or a replacement action before confirming the priority assessment, order, contraindication, and expected response.

What to expect on the PNLE

The inventory supports questions that begin with a clinical cue, laboratory result, medication context, treatment response, or teaching statement. Representative forms include interpreting facial twitching, identifying weakness linked to phosphate imbalance, recognizing refractory hypokalemia with low magnesium, choosing a priority assessment in hyperkalemia, evaluating dietary potassium knowledge, and judging neurologic change after sodium correction.

The live difficulty distribution is 5 easy, 10 medium, and 8 hard. Its Bloom distribution is 6 remembering, 1 understanding, 9 applying, 4 analyzing, and 3 evaluating.

Remembering: Retrieve characteristic manifestations and safety associations for each electrolyte.
Applying: Select the first nursing action when a client presents with a named imbalance and clinical cue.
Analyzing: Combine the laboratory result with symptoms, trends, medications, losses, or coexisting electrolyte findings.
Evaluating: Judge whether an intervention, response, or teaching statement is safe and appropriate.

Exact topic distribution varies by exam form. Treat this inventory as a practice map for decision skills, not as a prediction of how many sodium, potassium, calcium, magnesium, or phosphate questions will appear. Keep each item within the canonical scope and identify whether the central task is recognition, prioritization, safe action, or evaluation.

Study tips

Start with diagnostic practice. Work through the 23 questions before reviewing notes. Mark each answer as confident, guessed, or incorrect, then record the cue that led to your decision and the cue you overlooked.
Use focused retrieval by electrolyte. Study sodium, potassium, calcium, magnesium, and phosphate in separate short sessions. For each one, retrieve the major clinical cues, priority risk, first assessment, safe nursing action, and monitoring point without looking at your notes.
Make a comparison grid.
Self-made comparison grid:
Electrolyte | Key cue | Immediate risk | First assessment | Ordered action or teaching | Safety check
Sodium | neurologic change | seizure or altered status | neurologic assessment | prescribed correction and reassessment | avoid rapid correction
Potassium | weakness or cardiac change | dysrhythmia | cardiac assessment | verify order and monitoring | review magnesium and medications
Calcium | twitching or spasms | neuromuscular deterioration | airway and muscle status | prescribed management | interpret signs in context
Magnesium | persistent hypokalemia | cardiac or neuromuscular risk | full electrolyte review | ordered replacement | reassess response
Phosphate | marked weakness | functional decline | mobility and respiratory effort | prescribed management | assess before replacing
Review rationales and errors. For every missed or guessed item, write why the correct action is safer, which distractor was attractive, and whether the problem involved recognition, priority setting, treatment safety, or response evaluation.
Retry with spacing. Revisit missed questions after a gap, then explain the answer aloud using the clinical cue and decision rule. Change the retry order so recall is based on the problem, not on memorized answer positions.
Finish with mixed timed practice. Combine all five electrolytes in one set and practice moving from cue recognition to priority assessment, prescribed action, and reassessment. Keep acid-base interpretation and renal replacement therapy outside this topic set.

Common mistakes to avoid

Anchoring on the laboratory value: Selecting an intervention solely because a result is high or low can miss the client’s actual priority. Correct this by pairing the result with symptoms, trend, medication history, ongoing losses, and cardiac or neurologic findings.
Missing the potassium-magnesium link: Repeating potassium replacement without reviewing magnesium can overlook a reason for persistent hypokalemia. When potassium remains low despite treatment, reassess the broader electrolyte pattern and follow the prescribed monitoring plan.
Correcting sodium too quickly: Treating a sodium result as a race can create a safety problem. Neurologic decline after rapid correction requires prompt reassessment and escalation, with further management guided by the prescribed correction and monitoring plan.
Putting teaching before instability: Offering dietary advice first in a client with cardiac, neurologic, or rapidly worsening muscular findings misorders priorities. Address airway, breathing, circulation, focused assessment, and urgent reporting before routine education.
Overreading a single bedside sign: A positive Chvostek response supports concern for neuromuscular irritability but does not establish the complete diagnosis by itself. Confirm the finding with the broader assessment and watch for spasms, worsening weakness, or airway concerns.
Misunderstanding medication-related electrolyte shifts: When insulin is used to move potassium into cells, a lower serum result does not by itself prove that the underlying problem is resolved. Reassess the ordered response and monitoring; when digoxin is present with low potassium or magnesium, treat the combination as a medication-safety concern.

Try a question

A real Electrolyte Disorders question from our bank. Give it a shot.

Medium

Tapping over a patient's facial nerve produces twitching around the mouth and eye. Which electrolyte disturbance is most associated with this finding?

A

Hypocalcemia

B

Hyperkalemia

C

Hypercalcemia

D

Hypernatremia

Rationale

Tapping over the patient's facial nerve—just anterior to the ear at the zygomatic arch—eliciting twitching of the facial muscles (notably around the mouth and eye) is known as Chvostek's sign. This is a classic clinical finding in hypocalcemia. Understanding this connection is essential for safe nursing assessment and prioritization in medical-surgical settings.

Sign	Associated Electrolyte Disturbance
Chvostek's sign	Hypocalcemia
Trousseau's sign	Hypocalcemia

Why Hypocalcemia Produces Chvostek’s Sign:

Calcium plays a key role in stabilizing neuronal membranes and regulating neuromuscular excitability. In hypocalcemia, there is decreased serum calcium, leading to increased excitability of peripheral nerves. Even mild stimulation of the facial nerve can then cause involuntary muscle contraction (twitching), making Chvostek’s sign a sensitive indicator of low calcium levels.
Additional symptoms of hypocalcemia: muscle cramps, paresthesias, tetany, and in severe cases, laryngospasm or seizures.
Common causes: thyroid/parathyroid surgery, vitamin D deficiency, chronic kidney disease, and acute pancreatitis.

Why the Other Choices Are Incorrect:

B. Hyperkalemia: This refers to elevated potassium levels. It primarily affects cardiac conduction, leading to ECG changes (peaked T waves, PR prolongation, QRS widening) and neuromuscular symptoms like generalized weakness—not facial nerve hyperexcitability or a positive Chvostek's sign.
C. Hypercalcemia: High calcium levels have the opposite effect—they decrease neuromuscular excitability. Instead of twitching, patients may show muscle weakness, lethargy, and decreased deep tendon reflexes. Hypercalcemia is never associated with a positive Chvostek's sign.
D. Hypernatremia: This is an elevated sodium level, often leading to neurological changes such as confusion or seizures due to dehydration and osmotic shifts—but not isolated facial twitching following nerve tapping.

Clinical Pearl: Remember "Cheek Chvostek = C for Calcium": Chvostek’s sign is a cheek tap that reveals CALCIUM deficiency (hypocalcemia).

Test-Taking Insight: This question targets the nurse’s ability to match specific physical signs to electrolyte imbalances. It requires recognition of clinical findings and correlation with underlying pathophysiology for accurate assessment and timely intervention.

Hinkle, Janice L., Cheever, Kerry H., & Overbaugh, Kristen J. (2022). Brunner & Suddarth's Textbook of Medical-Surgical Nursing (15th ed.). Wolters Kluwer. https://shop.lww.com/Brunner---Suddarth-s-Textbook-of-Medical-Surgical-Nursing/p/9781975161033

References and further reading

PRC Enhanced Table of Specifications for the Nurses Licensure Examination official
The current public competency and cognitive-level blueprint, effective from the November 2025 NLE onward.
Tangerine Prep PNLE Reviewer question bank
The live source for the published question count, question previews, rationales, and inventory distributions on this page.

How this page is built

The counts and distributions on this page come from Tangerine Prep's live published question bank. The source inventory was last updated on August 12, 2026.

The questions are original PNLE-style practice items, not recalled or leaked board questions. Topic scope follows Tangerine's pedagogical taxonomy and is mapped to the PRC 2025 Enhanced Table of Specifications, effective from the November 2025 NLE onward. Exact topic distribution varies by exam form.