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Abdominal Examination in Pregnancy
Sources: Textbook of Family Medicine 9e (Rakel), Park's Textbook of Preventive and Social Medicine, Creasy & Resnik's Maternal-Fetal Medicine
Position & Preparation
- Patient lies in dorsal recumbent position (semi-recumbent, 15-30° tilt to avoid aortocaval compression after 20 weeks)
- Bladder should be emptied before examination
- Expose abdomen from xiphisternum to pubic symphysis
- Warm hands before palpation
I. INSPECTION
Look for:
| Finding | Significance |
|---|
| Shape & size of uterus | Consistency with gestational age |
| Linea nigra | Dark vertical midline pigmentation - normal in pregnancy |
| Striae gravidarum | Stretch marks - pink/purple (new), silvery (old) |
| Umbilicus | Becomes flat/everted as pregnancy advances |
| Fetal movements | Visible rippling after ~28 weeks |
| Scars | Previous LSCS, laparotomy |
| Skin | Jaundice, spider angiomata |
| Shape | Transverse/longitudinal lie visible with large fetus |
II. MEASUREMENT OF FUNDAL HEIGHT
Fundal height correlates directly with gestational age from ~16 weeks onward.
Fundal Height at Various Gestational Ages:
| Weeks | Fundal Level |
|---|
| 12 weeks | Just palpable above pubic symphysis |
| 16 weeks | Between symphysis and umbilicus |
| 20 weeks | At the level of the umbilicus |
| 24 weeks | Midway between umbilicus and xiphisternum |
| 28 weeks | 3-4 fingers above umbilicus |
| 32 weeks | Midway between umbilicus and xiphisternum (upper) |
| 36 weeks | At the level of xiphisternum |
| 40 weeks | Drops slightly (lightening) - at 32-week level |
From Park's Textbook - Uterine fundal height at various stages:
Symphysis-Fundal Height (SFH) Measurement (after 20 weeks):
From Textbook of Family Medicine 9e - Fundal growth at various weeks of gestation:
- Measure from upper border of pubic symphysis to the top of the uterine fundus with a tape measure
- SFH (cm) = gestational age in weeks ± 2 cm (after 20 weeks)
- Causes of large-for-dates: multiple gestation, polyhydramnios, macrosomia, fibroids, incorrect dates
- Causes of small-for-dates: IUGR, oligohydramnios, incorrect dates, fetal demise, transverse lie
III. PALPATION - Leopold's Maneuvers
Performed from 30 weeks onward to determine fetal lie, presentation, position, and engagement.
The 4 Leopold's Maneuvers:
Maneuver 1 - Fundal Grip (What is in the fundus?)
- Face the patient's head
- Cup both hands around the fundus
- Feel which fetal pole is at the fundus
- Breech (buttocks) = soft, irregular, not ballottable
- Head = hard, round, ballottable
Maneuver 2 - Lateral/Umbilical Grip (Where is the back?)
- Hands slide down laterally from fundus
- One hand stabilizes; other palpates the opposite side
- Back = smooth, firm, continuous resistance
- Limbs = irregular nodular, small parts
Maneuver 3 - Pawlik's Grip / First Pelvic Grip (What is the presenting part?)
- Examiner faces patient's head
- Thumb and fingers of one hand grasp the presenting part just above the pubic symphysis
- Head = hard, round, ballottable (if not engaged)
- Buttocks = soft, irregular
Maneuver 4 - Second Pelvic Grip (Degree of engagement/flexion)
- Examiner turns to face the patient's feet
- Both hands placed on the lower uterus, fingers pointing toward the pelvis
- Fingers walk down toward pelvic brim
- Cephalic prominence = the brow side (if on same side as back = deflexed/extended; if on opposite side = well-flexed, normal)
- Determines degree of descent into pelvis
IV. AUSCULTATION
Fetal Heart Sounds (FHS):
| Method | Audible from |
|---|
| Pinard fetoscope / Fetal stethoscope | 20-24 weeks |
| Sonicaid / Doppler | 10-12 weeks |
Normal FHR: 120-160 beats per minute
Where to Auscultate:
- FHS are heard best through the fetal back
- Cephalic presentation, LOA (Left Occiput Anterior): Left lower quadrant
- Cephalic presentation, ROA: Right lower quadrant
- Breech presentation: At or above the umbilicus
- After 28 weeks, location changes with fetal position
V. SPECIAL TESTS ON PALPATION
| Test | How Done | Finding |
|---|
| Ballottement | Tap lower pole of uterus with fingers | Free-floating head taps back = unengaged |
| Engagement | 4th maneuver - pawlik grip | Head not movable above brim = engaged (0/5 palpable) |
| Uterine tone | General palpation | Relaxed vs hypertonic (as in abruption) |
| Tenderness | Gentle palpation | Tenderness over fibroids, abruption, appendix |
VI. Summary of What Abdominal Exam Tells You
Inspection → Skin changes, shape, size, fetal movement, scars
Measurement → Gestational age, growth discrepancy
Palpation → Lie, presentation, position, engagement
Auscultation → FHR (rate, rhythm), fetal wellbeing
Quick Reference: Lie, Presentation, Position
| Term | Definition |
|---|
| Lie | Relationship of fetal long axis to uterine long axis (longitudinal/transverse/oblique) |
| Presentation | Part of fetus in the lower uterine segment (cephalic/breech/shoulder) |
| Position | Relationship of denominator to maternal pelvis (LOA, ROA, LOP, etc.) |
| Station | Level of presenting part relative to ischial spines (-3 to +3) |
| Engagement | Widest diameter of presenting part has passed the pelvic brim |
Sources: Textbook of Family Medicine 9e (Rakel), Park's Preventive & Social Medicine 25e, Creasy & Resnik's Maternal-Fetal Medicine 8e