Antenatal care: twin-to-twin transfusion: practice question

A OBG 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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OBG · Antenatal care: twin-to-twin transfusion

Sample item

In monochorionic diamniotic twins, one twin has oligohydramnios with an empty bladder while the co-twin has polyhydramnios and a distended bladder. What syndrome is likely?

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

The answer and the reasoning

D. Twin-to-twin transfusion syndrome

Twin-to-twin transfusion syndrome results from unbalanced placental vascular connections, creating a hypovolemic donor twin and hypervolemic recipient twin. It requires urgent fetal-medicine assessment.

Option by option

  • A. Twin reversed arterial perfusion sequence

    TRAP sequence involves an acardiac twin perfused by the pump twin.

  • B. Fetal hydrops from Rh disease only

    Rh disease can cause hydrops but not this donor-recipient fluid sequence.

  • C. Placenta previa

    Placenta previa concerns placental location over the cervix.

  • D. Twin-to-twin transfusion syndrome (correct)

    Correct. Oligohydramnios-polyhydramnios sequence is characteristic TTTS.

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 OBG question

What is the answer to this OBG question?

The best answer is D, Twin-to-twin transfusion syndrome. Twin-to-twin transfusion syndrome results from unbalanced placental vascular connections, creating a hypovolemic donor twin and hypervolemic recipient twin.

Why is "Twin reversed arterial perfusion sequence" not the answer?

TRAP sequence involves an acardiac twin perfused by the pump twin.

Why is "Fetal hydrops from Rh disease only" not the answer?

Rh disease can cause hydrops but not this donor-recipient fluid sequence.

Why is "Placenta previa" not the answer?

Placenta previa concerns placental location over the cervix.

What concept does this question test?

It tests Antenatal care: twin-to-twin transfusion in OBG. It requires urgent fetal-medicine assessment.

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 Antenatal care: twin-to-twin transfusion?

Learn management algorithms as steps: PPH, eclampsia, ectopic pregnancy. Then use the flashcards and the other OBG 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.