A 40-year-old female with progressive left flank pain, no mass or fever. What is the next best step?

INI-CET EXAM -2026

Medical Surgical Nursing

Medium

Appeared in: INI-CET EXAM -2026

Explanation

The patient's symptoms are classic for renal colic, where a kidney stone is the most likely cause.
The standard diagnostic algorithm prioritizes a stepwise approach, starting with safer, non-invasive methods.
Ultrasound is the ideal initial test as it is radiation-free and can effectively screen for hydronephrosis, a key sign of urinary obstruction from a stone.
If the ultrasound is non-diagnostic or more detail is required, a Non-Contrast CT (NCCT) is performed. NCCT is the gold standard for identifying the size, location, and density of kidney stones.
This sequence (Ultrasound followed by NCCT) provides a comprehensive evaluation while adhering to the principle of ALARA (As Low As Reasonably Achievable) for radiation exposure.

Option A: This sequence is illogical for the initial workup of suspected kidney stones. Contrast-enhanced CT (CECT) can obscure stones, and MRI is not a first-line imaging tool for this condition.
Option B: Using contrast is inappropriate as the initial step when a kidney stone is the primary suspicion. The intravenous contrast material is excreted by the kidneys and can make the ureters appear dense, potentially masking the presence of a stone.
Option D: While NCCT is the correct definitive test, planning to immediately follow it with a contrast CT is not the standard initial approach. The contrast portion is only added if the NCCT reveals a finding that requires further characterization, such as an indeterminate renal mass.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Diagnostic imaging for acute flank pain and suspected urolithiasis as background academic context rather than a clinical decision trigger.
A nurse's primary role in caring for a patient with suspected renal colic is pain management. The pain can be excruciating, and prompt administration of prescribed analgesics (often NSAIDs or opioids) is critical.
Nurses are responsible for preparing the patient for imaging studies, which includes providing information and ensuring any necessary pre-procedure requirements (like fasting, if contrast is anticipated later) are met.
A key nursing intervention is to strain all the patient's urine. Recovering a passed stone is essential for laboratory analysis to determine its composition, which guides future prevention strategies.

How to Approach the Question

First, analyze the patient's clinical presentation: a 40-year-old female with progressive flank pain but no fever or mass. This classic picture strongly suggests renal colic from a kidney stone.
Next, understand the question: it asks for the 'next best step,' implying a need to choose the most appropriate diagnostic sequence.
Recall the principles of medical imaging: start with the least invasive, safest, and most cost-effective test that can provide useful information.
Evaluate the imaging modalities in the options: Ultrasound (no radiation, good for screening), Non-Contrast CT (gold standard for stones, but has radiation), and Contrast-Enhanced CT (for masses/infection, can hide stones).
Compare the sequences. An approach starting with ultrasound is safer than one starting with CT. Following an inconclusive ultrasound with a non-contrast CT is the most logical and standard pathway.
Eliminate options that use contrast initially (A, B) as it can obscure stones. Eliminate the option that unnecessarily plans for a contrast study from the start (D), as the more judicious approach is to start with ultrasound (C).

Concept Tested & Keywords

Concept Tested: Diagnostic imaging for acute flank pain and suspected urolithiasis.
Stem keywords: 40-year-old female, progressive left flank pain, no mass, no fever, next best step
Lead-in keywords: best step
Clinical cues: The combination of flank pain without fever strongly points towards a non-infectious cause like a kidney stone rather than pyelonephritis.

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E6 Medicine Davidson Principles Practice 24e p. 409-411

E6 Gynecology Williams p. 272-333