Antenatal care: dating: 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: dating

Sample item

Which ultrasound measurement is most accurate for establishing gestational age in the first trimester?

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

The answer and the reasoning

A. Crown-rump length

Crown-rump length measured in the first trimester gives the most accurate ultrasound estimate of gestational age. Later biometric measures have wider biological variation.

Option by option

  • A. Crown-rump length (correct)

    Correct. First-trimester crown-rump length is the best dating measure.

  • B. Amniotic fluid index

    Amniotic fluid index assesses fluid volume, not pregnancy dating.

  • C. Abdominal circumference

    Abdominal circumference is used later for fetal growth assessment.

  • D. Femur length only

    Femur length contributes to later biometry but is less accurate for early dating.

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.

More OBG questions

Questions about this OBG question

What is the answer to this OBG question?

The best answer is A, Crown-rump length. Crown-rump length measured in the first trimester gives the most accurate ultrasound estimate of gestational age.

Why is "Amniotic fluid index" not the answer?

Amniotic fluid index assesses fluid volume, not pregnancy dating.

Why is "Abdominal circumference" not the answer?

Abdominal circumference is used later for fetal growth assessment.

Why is "Femur length only" not the answer?

Femur length contributes to later biometry but is less accurate for early dating.

What concept does this question test?

It tests Antenatal care: dating in OBG. Later biometric measures have wider biological variation.

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: dating?

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.