Which of the following investigation should be avoided during pregnancy?

RUHS, Jaipur, PB B.Sc Nursing Entrance-2023

Obstetrics & Gynaecology

Easy

Appeared in: RUHS, Jaipur, PB B.Sc Nursing Entrance-2023

Explanation

X-rays utilize ionizing radiation, which is known to be harmful to the developing fetus.
Exposure to ionizing radiation, especially during the first trimester (the period of organogenesis), can cause congenital malformations, growth restriction, and intellectual disability.
Radiation exposure in utero is also linked to an increased risk of childhood cancers, particularly leukemia.
The ALARA (As Low As Reasonably Achievable) principle guides clinical practice, meaning X-rays are avoided unless the maternal benefit significantly outweighs the fetal risk.

Option A: An ECG (Electrocardiogram) is a non-invasive test that records the electrical activity of the heart. It does not emit any radiation and is completely safe during pregnancy.
Option C: A 2D Echo (Echocardiogram) uses high-frequency sound waves (ultrasound), which is a form of non-ionizing radiation. It is considered safe and is frequently used for both maternal and fetal assessment during pregnancy.
Option D: A Hemogram (Complete Blood Count) is a routine blood test that involves drawing a sample of the mother's blood. It poses no radiation risk and is essential for monitoring maternal health (e.g., for anemia or infection) during pregnancy.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Safety of diagnostic investigations during pregnancy as background academic context rather than a clinical decision trigger.
Nurses play a crucial role in educating pregnant patients about the safety of prescribed tests, alleviating anxiety, and ensuring informed consent.
When a pregnant patient requires an X-ray, the nurse must ensure that appropriate lead shielding is used to cover the abdomen and pelvis to minimize fetal radiation exposure.
The nurse should be prepared to answer patient questions about why certain tests are ordered and why others are avoided, reinforcing the principles of fetal safety.

How to Approach the Question

First, identify the core of the question, which is about safety during pregnancy.
Next, analyze each option based on its underlying technology or mechanism.
Recall or deduce the potential effects of each investigation on a developing fetus. The key differentiator is often ionizing versus non-ionizing radiation.
ECG uses electrical signals, 2D Echo uses sound waves, and a Hemogram is a blood draw. None of these involve harmful radiation.
X-ray uses ionizing radiation, which is a known teratogen and carcinogen. Therefore, it is the investigation that should be avoided unless absolutely necessary.
Select the option that poses the most significant risk to the fetus.

Concept Tested & Keywords

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E6 Gynecology Williams p. 143-173

E6 Obstetrics Williams p. 6