The primary hormone responsible for maintaining the pregnancy in the early stages is . - GMCH Nursing Officer-2025

GMCH Nursing Officer-2025

Obstetrics & Gynaecology

Easy

Appeared in: GMCH Nursing Officer-2025

Explanation

Progesterone is the primary hormone for maintaining pregnancy in the early stages.
It prepares the uterine lining (endometrium) for implantation by causing the development of decidual cells, which nourish the early embryo.
Progesterone decreases the contractility of the uterus, preventing contractions that could lead to a spontaneous abortion.
Initially produced by the corpus luteum, its production is later taken over by the placenta around the 8th to 12th week of gestation.

Option A: While estrogen is essential for pregnancy, its primary roles are proliferative, such as causing the enlargement of the uterus and breasts and relaxing pelvic ligaments. It does not have the primary role of maintaining the uterine lining and preventing contractions.
Option B: Human Chorionic Gonadotropin (hCG) is crucial, but its role is indirect. Its main function is to 'rescue' the corpus luteum, stimulating it to continue producing progesterone. It does not directly maintain the pregnancy itself.
Option D: Oxytocin has the opposite effect of what is needed to maintain an early pregnancy. It is a potent stimulator of uterine contractions and is primarily involved in labor and delivery.

Visual 1: Diagram: A graph showing the levels of hCG, progesterone, and estrogen during the first trimester. This visual would clearly illustrate how hCG peaks early to stimulate the corpus luteum, leading to a sustained high level of progesterone which is essential for maintaining the pregnancy, while estrogen levels also rise steadily.
Visual 2: Flowchart: A flowchart illustrating the hormonal cascade in early pregnancy: Hypothalamus (GnRH) -> Pituitary (LH) -> Ovary (Corpus Luteum formation) -> Implantation -> Trophoblast produces hCG -> hCG stimulates Corpus Luteum -> Corpus Luteum produces Progesterone -> Progesterone maintains the endometrium.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Hormonal regulation of early pregnancy as background academic context rather than a clinical decision trigger.
Progesterone Supplementation: In cases of recurrent pregnancy loss or certain infertility treatments, clinicians may prescribe progesterone supplements (e.g., vaginal suppositories, injections) to support the uterine lining and help maintain the pregnancy during the critical early weeks.
Luteal Phase Defect: A condition where the corpus luteum does not produce enough progesterone is known as a luteal phase defect. This can lead to early pregnancy loss because the uterine lining is not adequately prepared for the implanting embryo.
What if? If a patient has a history of recurrent miscarriages and blood tests show low progesterone levels in early pregnancy, a nurse should anticipate the provider ordering progesterone supplementation and educate the patient on its importance and proper administration.

How to Approach the Question

First, identify the key terms in the question: 'primary hormone,' 'maintaining pregnancy,' and 'early stages.'
The word 'primary' suggests you need to find the hormone with the most direct and essential role in maintenance.
The phrase 'maintaining pregnancy' points towards functions like supporting the uterine lining and preventing contractions.
'Early stages' focuses the timeframe on the first trimester, when the corpus luteum and then the placenta are critical.
Evaluate each option's role: Estrogen is for growth, hCG is a stimulator, and Oxytocin is for contractions (labor).
Recall that Progesterone directly prepares the endometrium and keeps the uterus quiescent (calm).

Concept Tested & Keywords

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