Purpose of the urine test during first antenatal exam?

NIMHANS Nursing Officer - 2019

Obstetrics & Gynaecology

Easy

Appeared in: NIMHANS Nursing Officer - 2019

Explanation

The initial antenatal urine test is a fundamental screening tool to detect sugar (glucose) and protein.
The presence of glucose in the urine (glycosuria) is a potential indicator of Gestational Diabetes Mellitus (GDM).
The presence of protein in the urine (proteinuria) is a key warning sign for preeclampsia and underlying renal disease.
Early detection of these conditions through urinalysis is critical for timely management and improving maternal and fetal outcomes.

Option B: Measuring urine volume is not a primary objective of a routine spot urine test during the first antenatal visit. It doesn't screen for the most common pregnancy-related complications like GDM or preeclampsia.
Option C: While specific gravity is a component of a complete urinalysis that assesses the kidney's concentrating ability, it is not the main purpose of the initial screening. The focus is on detecting specific pathological substances like glucose and protein.
Option D: Syphilis is diagnosed using serological (blood) tests, such as the Venereal Disease Research Laboratory (VDRL) or Rapid Plasma Reagin (RPR) test, not through a urine test.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Routine Antenatal Screening as background academic context rather than a clinical decision trigger.
Routine urinalysis for glucose and protein is a cornerstone of antenatal care, enabling early detection of GDM and preeclampsia, two of the most significant contributors to maternal and fetal morbidity.
A positive finding on a dipstick test (e.g., 1+ protein or 2+ glucose) is not a diagnosis but a trigger for further investigation, such as a 24-hour urine protein collection, blood pressure monitoring, or an oral glucose tolerance test (OGTT).
Nurses play a vital role in collecting urine specimens correctly, performing dipstick tests accurately, interpreting the results, and educating the patient about the significance of the findings and the need for follow-up.

How to Approach the Question

Identify the keywords in the question: "purpose," "urine test," and "first antenatal exam."
Recall the standard components of initial prenatal care and the rationale for each test.
Evaluate each option based on established obstetric screening protocols.
Option A (sugar & protein) directly relates to screening for gestational diabetes and preeclampsia, which are major concerns in pregnancy.
Options B (volume) and C (specific gravity) are related to general kidney function and hydration but are not the primary screening targets in this context.
Option D (syphilis) is incorrect because the screening method is a blood test, not a urine test.

Concept Tested & Keywords

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E6 Textbook of Biochemistry for medical StudentsDM Vasudevan Part 2 — Subpart A (pp 1-239 of 478) p. 55-57

E6 Pathology-Vandana Puri & Kavita Gaur Textbook of Pathology and Genetics p. 447-449