Identify the formula which is used for the estimation of the fetal weight?

AIIMS Raipur - 2017 (Shift-3)

Obstetrics & Gynaecology

Medium

Appeared in: AIIMS Raipur - 2017 (Shift-3)

Explanation

'All of these' because Johnson's, Shepard's, and Hadlock's are all recognized and utilized formulas for estimating fetal weight.
Johnson's formula provides a clinical estimate based on symphysis-fundal height, making it useful for bedside assessments or in low-resource settings.
Shepard's and Hadlock's formulas are based on sonographic (ultrasound) measurements of fetal biometry, such as biparietal diameter (BPD), abdominal circumference (AC), and femur length (FL).
Hadlock's formula is often preferred for its accuracy as it typically incorporates more biometric parameters than Shepard's formula.

Option A: This option is incomplete. While Johnson's formula is a valid method for estimating fetal weight, it is not the only one. Shepard's and Hadlock's formulas are also widely used.
Option B: This option is incomplete. Shepard's formula is a correct method, but Johnson's and Hadlock's are also valid formulas for fetal weight estimation.
Option C: This option is incomplete. Hadlock's formula is a common and accurate method, but it is not the only one. Johnson's and Shepard's formulas are also used.

Visual 1: Diagram - An illustration showing how to measure the symphysis-fundal height on a pregnant woman, which is the basis for Johnson's formula.
Visual 2: Infographic - A diagram of a fetus with labels pointing to the Biparietal Diameter (BPD), Abdominal Circumference (AC), and Femur Length (FL), the key measurements for Shepard's and Hadlock's formulas.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Formulas for Fetal Weight Estimation as background academic context rather than a clinical decision trigger.
Estimating fetal weight is crucial for managing pregnancy and planning for delivery. It helps in identifying fetuses that may be macrosomic (abnormally large) or have intrauterine growth restriction (IUGR).
Knowledge of the estimated fetal weight can influence decisions regarding the mode of delivery (vaginal vs. cesarean section) to prevent complications like shoulder dystocia.
What if? - If a pregnant woman presents in active labor in a remote clinic without ultrasound facilities, the nurse or doctor would rely on Johnson's formula (using a simple measuring tape for fundal height) to get a quick estimate of the fetal weight to anticipate potential delivery complications.

How to Approach the Question

First, identify the core of the question, which is about methods for 'estimation of fetal weight'.
Next, examine the options provided: Johnson's formula, Shepard's formula, and Hadlock's formula.
Recognize that in clinical practice, there are often multiple ways to measure or estimate a value. All three names are associated with obstetrics.
Consider the possibility that all three options are correct methods. If so, look for an 'All of the above' or 'All of these' option.
Since options A, B, and C are all valid formulas, the most comprehensive and correct answer is D, 'All of these'.

Concept Tested & Keywords

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