The average duration to give birth to a full-term baby is -

Appeared in: Raj. CHO - 2023

Explanation

The average duration of a human pregnancy is conventionally calculated as 280 days or 40 weeks.
This calculation starts from the first day of the woman's last menstrual period (LMP), which is the standard practice in obstetrics.
A delivery around 280 days is considered a 'full-term' birth.
The actual gestational period from fertilization is approximately 266 days, as conception usually occurs about two weeks after the LMP begins.

Option A: 250 days corresponds to approximately 35-36 weeks of gestation, which is classified as 'late preterm', not full-term.
Option C: 200 days corresponds to approximately 28-29 weeks of gestation. This is considered 'very preterm'.
Option D: 150 days corresponds to approximately 21-22 weeks of gestation. This is 'extremely preterm' and is at the very edge of viability with a low chance of survival.

Visual 1: Infographic. A timeline of pregnancy from 0 to 40 weeks, showing the trimesters and clearly marking the ranges for preterm, early term, full term, late term, and post-term.
Visual 2: Diagram. An illustration of Nägele's rule using a calendar, visually demonstrating how to subtract 3 months and add 7 days from an example LMP to find the EDD.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Duration of human pregnancy and calculation of the estimated due date as background academic context rather than a clinical decision trigger.
Accurately determining the gestational age and Estimated Date of Delivery (EDD) is fundamental in prenatal care. It guides the timing of various screenings, monitors fetal growth, and informs decisions regarding interventions for preterm or post-term pregnancies.
Nurses use the EDD to educate expectant parents about fetal development milestones, prepare them for childbirth, and plan for postpartum care.
What if? If a woman has irregular menstrual cycles or cannot recall her LMP, a first-trimester ultrasound is the most accurate method to determine the gestational age and establish the EDD.

How to Approach the Question

This is a factual recall question testing a fundamental concept in obstetrics.
Identify the keywords in the question: 'average duration' and 'full-term baby'.
Recall the standard definition of a full-term pregnancy's length as calculated in clinical practice.
The standard duration is 40 weeks, which translates to 280 days (40 weeks x 7 days/week).
Select the option that matches this value.
Mentally review the other options to confirm they represent preterm durations, reinforcing your choice.

Concept Tested & Keywords

Concept Tested: Duration of human pregnancy and calculation of the estimated due date.
Stem keywords: average duration, full-term baby, give birth
Lead-in keywords: BEST, MOST RELEVANT CLUE

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Practise the full Raj. CHO - 2023

Attempt every question from this paper in a timed mock, then review the full solution for each one.