2.2 Leopold Maneuvers, Fetal Heart Auscultation & Antepartum Surveillance
Key Takeaways
- A reactive non-stress test at 32 weeks or later requires two or more accelerations of at least 15 bpm lasting at least 15 seconds within 20 minutes; before 32 weeks the criterion is 10 bpm for 10 seconds.
- A biophysical profile of 8 out of 10 with oligohydramnios is non-reassuring and generally indicates delivery at 36 to 37 weeks or later, despite the apparently high score.
- A biophysical profile of 0 to 4 out of 10 indicates acute fetal asphyxia and warrants immediate delivery regardless of gestational age.
- A positive contraction stress test shows late decelerations with at least 50 percent of contractions, even when contraction frequency is fewer than three in 10 minutes.
- Handheld Doppler detects fetal heart tones by 10 to 12 weeks, while a fetoscope or Pinard stethoscope requires 18 to 20 weeks; the maternal radial pulse must be palpated simultaneously to avoid counting maternal tachycardia.
Leopold Maneuvers
Leopold maneuvers are a systematic, four-step abdominal palpation technique utilized to determine fetal lie, presentation, position, and engagement, typically performed reliably after 28 weeks gestation.
Leopold Maneuvers Flowchart
├── 1st Maneuver (Fundal Grip) ──> Palpate fundus: Head (firm/round/ballottable) vs. Breech (soft/irregular)
├── 2nd Maneuver (Lateral Grip) ──> Palpate sides: Fetal Back (smooth/firm spine) vs. Extremities (nodular)
├── 3rd Maneuver (Pawlik's Grip) ──> Grasp lower pole above symphysis: Identifies presenting part & mobility
└── 4th Maneuver (Pelvic Grip) ──> Face patient's feet: Assesses cephalic prominence & degree of head flexion
- First Maneuver (Fundal Grip): The examiner faces the patient and palpates the upper uterine fundus. Distinguishes between the cephalic pole (round, firm, hard, highly mobile and ballottable) and the breech pole (larger, softer, nodular, and non-ballottable).
- Second Maneuver (Umbilical / Lateral Grip): The examiner places palmar surfaces of both hands on either side of the maternal abdomen. One side reveals a smooth, firm, continuous convex resistance (the fetal back), while the opposite side reveals multiple small, irregular, nodular angularities (the fetal limbs and small parts). Clinical Pearl: Auscultate fetal heart tones directly over the convex curvature of the fetal back.
- Third Maneuver (Pawlik's Grip): The examiner uses the thumb and fingers of one hand to grasp the lower abdomen immediately above the symphysis pubis. Identifies what occupies the lower uterine pole and confirms whether the presenting part is unengaged (mobile) or engaged in the maternal pelvis.
- Fourth Maneuver (Facing Feet / Deep Pelvic Grip): The examiner turns to face the patient's feet and slides the fingers of both hands downward along the lower uterine segment into the pelvic inlet. Determines the location of the cephalic prominence: if the cephalic prominence is on the side opposite the fetal back, the head is well-flexed (vertex presentation).
Fetal Heart Rate Auscultation & Fetal Kick Counts
FHT Auscultation Modalities
- Handheld Doppler Ultrasound: Readily auscultates fetal heart tones by 10 to 12 weeks gestation.
- DeLee Fetoscope / Pinard Stethoscope: Relies on acoustic bone conduction (true acoustic sound rather than frequency-shifted ultrasound); detects FHTs by 18 to 20 weeks gestation.
- Normal Baseline Fetal Heart Rate: 110 to 160 beats per minute (bpm).
- Midwifery Safety Practice: Always palpate the maternal radial pulse concurrently during FHT auscultation to ensure the clinician is not inadvertently counting maternal tachycardia or uterine artery souffle.
Fetal Movement Surveillance (Kick Counts)
Fetal movement reflects an intact central nervous system and metabolic stability. Subjective perception of movement (quickening) typically begins at 18–20 weeks in primigravidas and 16–18 weeks in multiparas.
- Cardiff "Count to 10" Protocol: The patient lies on her left side in a quiet environment, ideally after a meal, and counts distinct fetal movements (kicks, rolls, swishes). The patient should feel at least 10 discrete fetal movements within a 2-hour window.
- Management of Decreased Fetal Movement (DFM): If the patient does not perceive 10 movements within 2 hours, or reports a profound qualitative reduction, she must be evaluated immediately in a clinical setting with a Non-Stress Test (NST) and an ultrasound assessment of amniotic fluid volume.
Antepartum Fetal Surveillance Modalities
Surveillance tools assess fetal autonomic tone and uteroplacental respiratory reserve in high-risk conditions (e.g., GDM, chronic hypertension, FGR, postdates, oligohydramnios).
1. Non-Stress Test (NST)
The NST evaluates fetal heart rate accelerations in response to autonomic stimulation during fetal movement.
| Gestational Age | Criteria for a Reactive (Normal) NST | Clinical Action if Non-Reactive at 40 Minutes |
|---|---|---|
| ≥32 0/7 weeks | ≥2 accelerations peaking at ≥15 bpm above baseline, each lasting ≥15 seconds from onset to return, within a 20-minute window (the 15x15 rule). | Apply Vibroacoustic Stimulation (VAS) for 1–3 seconds to awaken fetus; extend tracing to 40 minutes. If still non-reactive, proceed immediately to a Biophysical Profile (BPP) or Contraction Stress Test (CST). |
| <32 0/7 weeks | ≥2 accelerations peaking at ≥10 bpm above baseline, each lasting ≥10 seconds, within a 20-minute window (the 10x10 rule). | Same escalation pathway; accounts for neurological immaturity of autonomic innervation. |
2. Biophysical Profile (BPP)
The complete BPP combines the NST with dynamic real-time ultrasound assessment of four biophysical parameters over a continuous 30-minute observation period. Each parameter receives either 2 points (normal) or 0 points (abnormal).
Biophysical Profile (BPP) Parameters (Scored 0 or 2, Total out of 10)
├── 1. Non-Stress Test (NST) ──> Reactive: ≥2 accelerations (15x15) in 20-40 min (2 pts)
├── 2. Fetal Breathing Movements (FBM) ──> ≥1 episode of continuous rhythmic breathing ≥30 sec (2 pts)
├── 3. Gross Body Movement ──> ≥3 discrete body or limb movements in 30 min (2 pts)
├── 4. Fetal Tone ──> ≥1 episode of active extension with return to flexion / hand opening (2 pts)
└── 5. Amniotic Fluid Volume (AFV) ──> Single deepest vertical pocket (DVP) > 2 cm & ≥ 1 cm wide (2 pts)
Interpretation and Midwifery Management of BPP Scores
- 10/10 or 8/10 (with normal fluid): Reassuring of fetal well-being. Perinatal mortality within 1 week of a normal BPP is exceptionally low (<1 per 1,000).
- 8/10 with Abnormal Fluid (Oligohydramnios): Non-reassuring. Reflects chronic uteroplacental insufficiency; delivery is generally indicated if gestational age is ≥36–37 weeks, or intensive hospitalization and surveillance if preterm.
- 6/10 with Normal Fluid: Equivocal result. Possible fetal asphyxia. If at term (≥37 0/7 weeks), deliver. If preterm (<37 weeks), repeat BPP within 12 to 24 hours or perform a Contraction Stress Test.
- 6/10 with Oligohydramnios: High risk. Proceed to delivery if ≥32 weeks.
- 0 to 4/10: Strongly indicative of acute fetal asphyxia and severe acidemia. Immediate delivery is indicated regardless of gestational age.
3. Modified BPP (mBPP)
Combines a Non-Stress Test (acute marker) with the Amniotic Fluid Index (AFI, chronic marker). A normal mBPP requires a reactive NST and an AFI >5.0 cm (or single deepest pocket >2.0 cm). Oligohydramnios on mBPP mandates comprehensive evaluation.
4. Contraction Stress Test (CST)
Assesses fetal respiratory reserve by observing FHR patterns during uterine contractions (3 contractions lasting ≥40 seconds in 10 minutes, induced via oxytocin or nipple stimulation).
- Negative CST (Normal / Reassuring): No late or significant variable decelerations.
- Positive CST (Abnormal): Late decelerations occurring with ≥50% of contractions, even if contraction frequency is <3 in 10 minutes. Indicates uteroplacental insufficiency.
- Contraindications: Prior classical cesarean section, placenta previa, vasa previa, preterm premature rupture of membranes (PPROM), or high risk for preterm labor.
A 39-week primigravida undergoes antepartum fetal surveillance for decreased fetal movement. Real-time ultrasound and electronic monitoring reveal: reactive NST with 2 qualifying accelerations in 20 minutes (2 points); one 45-second episode of rhythmic fetal breathing (2 points); four discrete trunk movements (2 points); active limb extension with immediate flexion (2 points); and a maximum vertical pocket of amniotic fluid measuring 1.4 cm by 0.8 cm (0 points). The total BPP score is 8/10. What is the most appropriate midwifery management plan?