The hormone necessary to identify a positive pregnancy test is?

IGNOU PB Bsc Nsg Entrance-2017

Obstetrics & Gynaecology

Easy

Appeared in: IGNOU PB Bsc Nsg Entrance-2017

Explanation

Human Chorionic Gonadotropin (hCG) is a hormone produced almost exclusively by the placental syncytiotrophoblast cells after implantation.
Because it is unique to pregnancy and its levels rise rapidly and predictably in early gestation, it serves as the definitive marker for pregnancy confirmation.
Both over-the-counter urine tests and clinical blood tests are designed to detect the presence of hCG or its beta (β) subunit.
The primary function of hCG is to signal the corpus luteum to continue producing progesterone, which prevents menstruation and maintains the uterine lining for the developing embryo.

Option A: Progesterone is essential for maintaining the endometrium during pregnancy, but it is also present in the luteal phase of the menstrual cycle in non-pregnant women, making it a non-specific marker for pregnancy testing.
Option B: Estrogen levels rise throughout pregnancy and are vital for fetal development and maternal physiological changes, but they are not the primary hormone measured to diagnose pregnancy.
Option D: Growth hormone is involved in regulating metabolism and physical growth and has no direct role in the confirmation of pregnancy.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Hormonal basis of pregnancy testing as background academic context rather than a clinical decision trigger.
Nurses play a key role in educating patients about the correct timing and procedure for home pregnancy tests to ensure accuracy and avoid false negatives.
Understanding hCG levels is critical in clinical practice for monitoring the viability of an early pregnancy. Abnormally low, plateauing, or rapidly falling hCG levels can indicate a failing pregnancy, a miscarriage, or an ectopic pregnancy, requiring further investigation.
What if? If a patient's hCG levels are abnormally high for the gestational age, it could suggest a multiple gestation (e.g., twins) or a molar pregnancy (gestational trophoblastic disease), which requires immediate and specialized medical attention.

How to Approach the Question

First, identify the core of the question, which is asking for the specific hormone used in pregnancy tests.
Recall the key hormones involved in the menstrual cycle and pregnancy: estrogen, progesterone, LH, FSH, and hCG.
Differentiate their primary roles. Estrogen and progesterone are crucial for the cycle and maintaining pregnancy but are not unique to it.
Remember that Human Chorionic Gonadotropin (hCG) is produced by the developing placenta after implantation.
Conclude that because hCG is only produced in significant amounts during pregnancy, it is the definitive marker used for pregnancy tests.
Eliminate the other options based on their primary functions.

Concept Tested & Keywords

QbOzpQZwBgrU_O46O6jJYq

E6 Gynecology Williams p. 350-421

E6 Physiology Guyton 4SAE Part 3 p. 58-60

E6 Obstetrics Williams p. 6