The height of a uterus is midway between the symphysis pubis and umbilicus at which week of gestation?

AIIMS Bhopal NO - 2018 (Shift-1st)

Obstetrics & Gynaecology

Easy

Appeared in: AIIMS Bhopal NO - 2018 (Shift-1st)

Explanation

During pregnancy, the uterus expands out of the pelvic cavity at a predictable rate.
Fundal height measurement is a key component of antenatal assessment to monitor fetal growth and estimate gestational age.
At 16 weeks of gestation, the fundus of the uterus is located approximately halfway between the symphysis pubis (the joint of the pubic bones) and the umbilicus (navel).
This landmark is a standard reference point used by healthcare providers during prenatal check-ups.

Option A: At 8 weeks, the uterus is still a pelvic organ and has not grown large enough to be palpated abdominally above the symphysis pubis.
Option B: At 28 weeks, the fundal height is significantly higher, typically located about 6-8 cm (or three fingerbreadths) above the umbilicus, nearing the midpoint between the umbilicus and the xiphoid process.
Option D: At 12 weeks of gestation, the fundus of the uterus is just palpable at the level of the symphysis pubis as it begins to rise out of the pelvis.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Fundal Height Assessment during Pregnancy as background academic context rather than a clinical decision trigger.
Measuring fundal height is a non-invasive, cost-effective method to screen for fetal growth abnormalities, such as intrauterine growth restriction (IUGR) or macrosomia (large for gestational age).
A fundal height that is significantly smaller or larger than expected for the gestational age warrants further investigation, often with an ultrasound, to assess fetal well-being and amniotic fluid volume.
What if? If a patient at 16 weeks has a fundal height at the level of the umbilicus, it could suggest an incorrect gestational age, multiple gestation (twins), or other conditions like hydatidiform mole or polyhydramnios, requiring further evaluation.

How to Approach the Question

First, identify the key anatomical landmarks mentioned in the question: symphysis pubis and umbilicus.
The question asks for the gestational age when the uterine fundus is 'midway' between these two points.
Recall the standard progression of fundal height during pregnancy. The uterus starts in the pelvis and grows upwards.
At 12 weeks, the fundus is at the symphysis pubis. At 20-22 weeks, it reaches the umbilicus.
Logically, the midpoint between these two landmarks would be reached at a gestational age between 12 and 20 weeks.
Evaluate the options provided. 16 weeks falls directly in this range and is the standard milestone for this specific fundal height location. The other options (8, 12, and 28 weeks) represent different, distinct locations.

Concept Tested & Keywords

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E6 Midwifery Obstetrics and Gynecology Nursing Sandeep Kaur pp. 15-23, 50-60