Which of the following is tested in urine for the diagnosis of pregnancy?

Appeared in: IGNOU PB. Bsc. Nsg. Entrance-2025

Explanation

Human Chorionic Gonadotropin (hCG) is the primary hormone detected in urine and blood to confirm pregnancy.
It is produced by the syncytiotrophoblast cells of the developing placenta shortly after implantation.
The concentration of hCG doubles approximately every two days during the first trimester, making it a sensitive and early marker for pregnancy.
The beta (β) subunit of hCG is unique, allowing for specific detection in pregnancy tests without cross-reacting with other hormones.

Option A: Progesterone is vital for maintaining the endometrial lining and sustaining pregnancy, but its levels do not rise as rapidly or as uniquely as hCG in early gestation, making it an unsuitable marker for standard urine pregnancy tests.
Option B: Estrogen levels rise throughout pregnancy to support fetal development and prepare the body for lactation. However, it is not used as the primary diagnostic marker in early pregnancy tests.
Option D: Human Placental Lactogen (HPL) is secreted by the placenta, but its levels become significant only in the later stages of pregnancy. Its primary role is in maternal metabolism, not in signaling pregnancy in the early days.

Clinical Relevance

Nursing practice connection: Use the key finding related to Hormonal basis of pregnancy tests to guide bedside assessment, documentation, and the next nursing action.
Nurses play a key role in educating patients about the correct use of home pregnancy tests, including the importance of timing and using the first-morning urine for accuracy.
Understanding the hormonal basis of pregnancy is crucial for interpreting test results and counseling patients about potential false-positive or false-negative outcomes.
What if? If a patient has a positive urine test but sonography shows an empty uterus, the nurse should be aware that this could indicate a very early pregnancy, a complete abortion, or an ectopic pregnancy, necessitating serial hCG blood tests for clarification.

How to Approach the Question

Identify the core of the question: it asks for the specific hormone used in a urine test to diagnose pregnancy.
Recall the basic endocrinology of early pregnancy.
Think about which hormone is produced very early and uniquely by placental tissue after implantation.
hCG (Human Chorionic Gonadotropin) is known as the 'pregnancy hormone' for this reason.
Evaluate the other options: Progesterone and Estrogen are pregnancy-related but not the primary diagnostic markers. HPL is produced much later.
Select the option corresponding to hCG.

Concept Tested & Keywords

QhD34DFnoHz6RE6O6eiS2z

E6 Biochemistry U Satyanarayana— Part 2 (pp 421-820 of 840) p. 73-75

E6 Obstetrics Williams p. 6

Practise the full IGNOU PB. Bsc. Nsg. Entrance-2025

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