First trimester is up to -

Appeared in: UPPSC 2023

Explanation

Pregnancy is divided into three stages called trimesters, each lasting approximately 12 to 14 weeks.
The first trimester is the period from the first day of the last menstrual period (LMP) through the end of the 12th week.
This initial phase is a critical period of organogenesis, where all major organs and body systems of the fetus are formed.
Due to the rapid development, the fetus is most vulnerable to teratogens (substances that can cause birth defects) during this time.

Option A: 8 weeks marks the end of the embryonic period and the beginning of the fetal period, but it is still within the first trimester, not its endpoint.
Option C: 10 weeks is a point within the first trimester, but it does not represent the completion of this stage.
Option D: While some definitions divide the 40 weeks of pregnancy into three equal parts of about 13-14 weeks, the most common clinical convention marks the end of the first trimester at 12 weeks. 14 weeks is generally considered the start of the second trimester.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Definition and duration of the first trimester of pregnancy as background academic context rather than a clinical decision trigger.
Understanding the trimesters is fundamental for nurses to provide appropriate antenatal care, education, and support.
During the first trimester, nursing care focuses on confirming the pregnancy, calculating the due date, and educating the patient on crucial lifestyle changes, such as folic acid supplementation to prevent neural tube defects and avoiding teratogens (alcohol, certain medications, etc.) during the critical period of organogenesis.
Nurses also manage common first-trimester discomforts like nausea and vomiting and screen for potential complications.

How to Approach the Question

This is a factual recall question that tests your knowledge of standard obstetrical definitions.
Identify the key term in the question: 'First trimester'.
Recall the standard duration of the first trimester in weeks.
Evaluate the given options against this standard definition.
Eliminate options that represent points within the trimester (8 and 10 weeks) or the start of the next trimester (14 weeks).
Select the option that corresponds to the most widely accepted endpoint of the first trimester, which is 12 weeks.

Concept Tested & Keywords

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E6 Obstetrics Williams p. 72-94

Practise the full UPPSC 2023

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