Amniotic fluid index is measured by

RUHS, Jaipur, M.Sc Nursing Entrance Exam-2024

Obstetrics & Gynaecology

Easy

Appeared in: RUHS, Jaipur, M.Sc Nursing Entrance Exam-2024

Explanation

The Amniotic Fluid Index (AFI) is a quantitative estimate of amniotic fluid volume, a critical component of fetal assessment.
Ultrasonography is the standard, non-invasive diagnostic tool used to perform this measurement.
The technique involves dividing the uterus into four quadrants and summing the deepest vertical fluid pocket measurements from each quadrant to calculate the index.
Normal AFI values typically range from 5 to 24 cm, with values outside this range indicating potential fetal or maternal complications.

Option A: Measuring abdominal girth provides a general sense of uterine growth but is not a precise or reliable method for quantifying the specific volume of amniotic fluid.
Option C: The Leopold maneuver is a physical palpation technique used to determine the fetus's lie, presentation, and position within the uterus. It does not involve measuring fluid.
Option D: Ballottement is a palpation technique that confirms the presence of a floating fetus within the amniotic fluid. It is a qualitative assessment, not a quantitative measurement of fluid volume.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Measurement of Amniotic Fluid Index (AFI) as background academic context rather than a clinical decision trigger.
Monitoring AFI is a crucial part of antenatal surveillance, especially in high-risk pregnancies, as it helps in the early detection of oligohydramnios (low fluid) and polyhydramnios (excess fluid).
Abnormal AFI values are associated with increased perinatal morbidity and mortality and may prompt further investigations (like a detailed anomaly scan) or interventions (like induction of labor).
Oligohydramnios can be a sign of placental insufficiency, fetal growth restriction, or renal anomalies, while polyhydramnios can be linked to maternal diabetes, fetal gastrointestinal obstruction, or certain genetic syndromes.

How to Approach the Question

First, identify the key term in the question: 'Amniotic fluid index (AFI)'. The word 'index' suggests a specific, calculated measurement rather than a general observation.
Next, analyze the given options. Categorize them into types of procedures.
Recognize that 'Abdominal girth', 'Leopold maneuver', and 'Ballottement' are all physical examination techniques performed by hand (palpation) or with a simple measuring tape.
Recall or deduce that 'Ultrasonography' is an imaging technique that allows for precise visualization and measurement of internal structures, including the amniotic fluid.
Conclude that only ultrasonography provides the quantitative data needed to calculate an 'index'. Therefore, it is the correct method for measuring the AFI.

Concept Tested & Keywords

QtzCTjcrm4uZ5OIpppVACu

E6 Obstetrics Williams pp. 49-70, 50-70