Antenatal care: multiple pregnancy: 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: multiple pregnancy

Sample item

Why do monochorionic twin pregnancies require closer ultrasound surveillance than dichorionic twins?

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

The answer and the reasoning

D. Shared placental vascular connections can cause twin-to-twin transfusion syndrome

Monochorionic twins share a placenta and may have intertwin vascular anastomoses, predisposing to twin-to-twin transfusion syndrome and selective growth restriction. Chorionicity should be determined early.

Option by option

  • A. They have separate placentas by definition

    Separate placentas define dichorionic rather than monochorionic twins.

  • B. They cannot develop growth discordance

    Growth discordance can occur and needs surveillance.

  • C. They always deliver after 42 weeks

    Twin pregnancies are generally delivered earlier rather than after 42 weeks.

  • D. Shared placental vascular connections can cause twin-to-twin transfusion syndrome (correct)

    Correct. Shared vascular circulation creates unique monochorionic complications.

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, Shared placental vascular connections can cause twin-to-twin transfusion syndrome. Monochorionic twins share a placenta and may have intertwin vascular anastomoses, predisposing to twin-to-twin transfusion syndrome and selective growth restriction.

Why is "They have separate placentas by definition" not the answer?

Separate placentas define dichorionic rather than monochorionic twins.

Why is "They cannot develop growth discordance" not the answer?

Growth discordance can occur and needs surveillance.

Why is "They always deliver after 42 weeks" not the answer?

Twin pregnancies are generally delivered earlier rather than after 42 weeks.

What concept does this question test?

It tests Antenatal care: multiple pregnancy in OBG. Chorionicity should be determined early.

How hard is this question?

We tag it as an application question: it asks you to use a fact on a patient or a finding. 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: multiple pregnancy?

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.