Abdominal and GI imaging: Whitaker test: practice question

A Radiology question in the style of the NEET PG paper. Answer it first, then read why the right option is right and why each of the others is wrong.

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Radiology · Abdominal and GI imaging: Whitaker test

Sample item

An adult has persistent hydronephrosis on ultrasound and an equivocal diuretic renogram. Which test directly measures the pressure gradient across the pelviureteric junction to confirm obstruction?

Original practice item, not a recalled exam question. Nothing here is recorded.

The answer and the reasoning

D. Whitaker test

The Whitaker test perfuses contrast antegradely through a nephrostomy at a fixed rate while measuring pressure in the renal pelvis and bladder, and a gradient above a set level confirms obstruction. A cystourethrogram shows reflux, and urography and retrograde pyelography show anatomy but not pressure.

Option by option

  • A. Micturating cystourethrogram

    A micturating cystourethrogram demonstrates reflux and urethral anatomy.

  • B. Intravenous urogram

    Urography shows anatomy and drainage but does not measure pressure.

  • C. Retrograde pyelography

    Retrograde pyelography shows the collecting system outline, not pressure.

  • D. Whitaker test (correct)

    Correct. The Whitaker test measures the pressure gradient across the junction.

Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.

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Questions about this Radiology question

What is the answer to this Radiology question?

The best answer is D, Whitaker test. The Whitaker test perfuses contrast antegradely through a nephrostomy at a fixed rate while measuring pressure in the renal pelvis and bladder, and a gradient above a set level confirms obstruction.

Why is "Micturating cystourethrogram" not the answer?

A micturating cystourethrogram demonstrates reflux and urethral anatomy.

Why is "Intravenous urogram" not the answer?

Urography shows anatomy and drainage but does not measure pressure.

Why is "Retrograde pyelography" not the answer?

Retrograde pyelography shows the collecting system outline, not pressure.

What concept does this question test?

It tests Abdominal and GI imaging: Whitaker test in Radiology. A cystourethrogram shows reflux, and urography and retrograde pyelography show anatomy but not pressure.

How hard is this question?

We tag it as a multi-step question: it asks you to combine more than one idea. The tag is our own editorial judgement, not an official difficulty rating, so read the reason for every option, not only the answer.

How should I study Abdominal and GI imaging: Whitaker test?

Learn signs with the image, and the disease they point to. Then use the flashcards and the other Radiology questions on this site to test what stuck.

Is this a real NEET PG question?

No. It is an original practice item (editorial status: sample, version 1). NextPrep does not publish recalled or leaked questions, and independent faculty review of this item has not been completed yet, so confirm important facts in a standard textbook.