Obstetric abdominal examination and fetal assessment

• An obstetric abdominal examination is the repeated, hands-on assessment of a pregnant woman's abdomen, combined with maternal observations, that answers four questions at every antenatal visit: how is the mother, where is the baby, how is it growing and how is the pregnancy progressing.
• It is low-tech, takes only a few minutes, costs little and is performed from mid-pregnancy onward; it is paired with, not replaced by, ultrasonography when findings are doubtful or growth is not progressing as expected.
• Most of the examination is taught as a sequence that can be remembered as observations first, then inspection, measurement, palpation and auscultation; the hardest part is keeping the mother comfortable and making every finding unambiguous in the record.
• Key numbers recur: measure blood pressure and test urine for protein at every routine face-to-face visit; measure symphysis-fundal height after 24+0 weeks (NICE) or from the first prenatal visit (AAFP from 20 weeks); offer abdominal palpation after 36+0 weeks to check presentation; a normal fetal heart rate is 110 to 160 beats per minute; a fetus is macrosomic when estimated weight reaches 4000 g or more.
• A fresh finding should always be tested for consistency: lie, presentation and engagement are conclusions from palpation, confirmed by ultrasonography when they will change management.

By the end of this page you should be able to:

1. Prepare and explain a systematic antenatal abdominal examination to a pregnant woman, including consent, chaperone, hand hygiene, exposure and position.
2. Measure symphysis-fundal height correctly and explain how it is interpreted and when it triggers a scan.
3. Perform the four Leopold grips and state what each one answers.
4. Determine fetal lie, presentation, position and engagement in fifths, and auscultate the fetal heart.
5. Recognise signs of altered liquor volume, pre-eclampsia and other abnormalities on abdominal examination.
6. Present a set of findings at an antenatal visit in the standard order, verbally and in the notes, leading with the most important finding and stating the negatives that matter.
7. Avoid the common mistakes that make an antenatal examination unreliable or poorly documented.

This examination exists to keep pregnancy safe between visits. It is a screening tool used at every routine antenatal appointment in the second and third trimesters: it detects the maternal conditions that develop in pregnancy (hypertensive disorders, infection, poor nutrition), confirms that the baby is alive and growing, checks that it is presenting in a way that allows a planned vaginal birth, and reassures the woman that her care team is paying attention. It is performed in an antenatal clinic, day unit or maternity ward; the setting changes how much can be done, but the sequence and the documentation do not.

The World Health Organization places maternal and fetal assessment at the centre of routine antenatal care, and national guidance from the United Kingdom (NICE and the Royal College of Obstetricians and Gynaecologists) and the United States (ACOG, through standard obstetric texts and family-medicine guidance) agrees that a simple, repeatable bedside examination, plotted on a chart, is the backbone of that assessment. ^[5] This page covers the antenatal abdominal examination only. The related topic on obstetric examination and fetal heart rate monitoring covers the intrapartum examination, Bishop score, cardiotocography and fetal surveillance in labour; it should be read next, and its content is not repeated here.

Preparation is part of the examination, because a frightened, cold or exposed woman tenses her abdomen and hides everything you need to feel.

1. Explain and consent. Tell the woman what you will do and why, in plain words, and gain consent before touching her abdomen. Explain that you will need to press firmly but that it should not be painful, and that she can ask you to stop. Shared decision making is expected at every step. ^[1]
2. Chaperone. Offer a chaperone for every examination, in line with local policy; many women prefer one even for abdominal palpation, and its presence should be recorded.
3. Hand hygiene and infection control. Clean your hands and don gloves before palpation; clean and warm the equipment. Dispose of tape-measure covers and wipes as local protocol requires.
4. Exposure. Expose from the xiphisternum to the pubic symphysis, lifting (not removing) clothing and using a drape for dignity. A partially exposed abdomen forces you to guess at the fundal height and makes Leopold manoeuvres impossible.
5. Position. Lie the woman supine with a slight left lateral tilt, or on her left side, to avoid aortocaval compression. Empty the bladder first, both for comfort and because a full bladder tilts the uterus and mimics a high head. Keep her warm and supported with pillows.
6. Equipment. A validated blood-pressure device (validated in pregnancy), a urine dipstick, a flexible tape measure, a handheld Doppler or Pinard stethoscope, a watch, gloves, lubricating gel and, where indicated, a chaperone and an interpreter.
7. Baseline observations. Record maternal pulse, blood pressure, temperature where indicated, weight and urine results, and note gestational age from the best dating available. Start with the history in that visit: reduced fetal movements, contractions, bleeding, headache, visual disturbance, epigastric pain, ankle or hand swelling and changes in fetal movement pattern.

Work from head to toe in the same order at every visit, so that no element is forgotten and so that your documentation has a standard shape.

1. Maternal observations first. Measure and record blood pressure at every routine face-to-face antenatal appointment, using a device validated for use in pregnancy. ^[1] Offer a urine dipstick test for proteinuria at every routine face-to-face antenatal appointment. ^[1] Record weight when growth is being monitored. Ask about symptoms first: headache, visual disturbance, epigastric or right upper quadrant pain, reduced fetal movements, vaginal bleeding, liquor loss and contractions.
2. Inspect. Stand at the woman's right side and expose the abdomen from xiphisternum to pubic symphysis. Inspect the skin for striae, pigmentation, scars, herniae and the shape of the uterus: is it symmetrical, unusually large, lopsided, or taut?
3. Measure symphysis-fundal height. Place the woman supine with a slight left tilt. Find the upper border of the pubic symphysis with the side of one hand; place a centimetre tape at that point and run it in the midline over the abdomen to the highest point of the fundus, keeping the tape in contact with the skin and identifying the top of the fundus with the other hand. Read to the nearest centimetre. Plot the result on a standard growth chart at the visit. ^[1]
4. Determine the lie. Ballot the fundus gently with the fingertips to distinguish a hard, smooth, rounded head (which will dip and rebound) from a softer, irregular breech. In a longitudinal lie the fetal long axis matches the maternal long axis; in a transverse lie the head and breech lie to the woman's flanks; an oblique lie sits between the two.
5. Leopold manoeuvres. Perform the four grips in order, with the woman supine and the bladder empty:
   • Fundal grip (first). Cup both hands around the fundus to decide whether the head or the breech lies uppermost. This establishes the lie and the upper pole of the fetus.
   • Lateral or umbilical grip (second). Move the hands to the sides of the uterus and palpate for the fetal back (a firm, smooth, continuous resistance) and the small parts (knobbly, irregular projections). This tells you where the fetal spine lies and where to place the Doppler or Pinard.
   • Pawlik grip (third). Grasp the lower uterus just above the pubic symphysis to confirm the presenting part and to feel whether it is engaged in the pelvis.
   • Pelvic grip (fourth). Turn to face the woman's feet, place both hands on the lower abdomen and press towards the pelvic inlet to assess descent, engagement and, in a cephalic presentation, the degree of flexion of the head. Four classical manoeuvres are used to palpate the gravid uterus systematically. ^[4]
6. Presentation and engagement. From the grips, decide which part of the fetus is nearest the pelvic inlet: cephalic (head), breech (buttocks, feet or both) or shoulder. Estimate engagement of a cephalic head by how much of it is palpable above the pelvic brim, expressed in fifths: five-fifths palpable means the whole head is above the brim and unengaged; zero-fifths palpable means the head has descended and is no longer felt above the brim, that is, it is engaged. Each fifth step corresponds to the head passing through the pelvic brim towards station zero at the ischial spines. ^[8]
7. Position. If the presentation is cephalic, use the back and the small parts to decide where the occiput points: left or right, anterior, transverse or posterior (for example left occipito-anterior, right occipito-posterior). In breech presentations, note whether the sacrum is anterior, transverse or posterior.
8. Liquor assessment. Palpate the uterus for the amount of fluid around the fetus. Note whether the fetus is easy or difficult to feel, whether the head can be ballot and whether the uterus is tense or slack.
9. Oedema and reflexes. Press a fingertip into the skin over the shins, ankles and dorsum of the hands and look for pitting. In a woman with raised blood pressure or proteinuria, check deep tendon reflexes at the knees and ankles (and clonus) as part of assessing pre-eclampsia severity.
10. Auscultate the fetal heart. Use the lateral grip to find the fetal back; place the Doppler or Pinard over that point; count the heart rate for a full minute. Differentiate the fetal heart from the maternal pulse by palpating the woman's wrist or abdomen while listening, because the two pulses can be confused, especially when the fetus lies anteriorly. A normal fetal heart rate is 110 to 160 beats per minute. ^[6] Record a single rate, and note any acceleration or deceleration you hear. If no heartbeat is found, offer urgent real-time ultrasonography to check viability.

The table lists the principal findings gathered at an antenatal abdominal examination, how to elicit each and what it means. Many are screening findings, not diagnoses; they tell you what to confirm with ultrasonography, blood tests or further assessment.

A presentation should make the next clinician's job easy. Lead with the gestation and the most important finding, follow the fixed order below, state the negatives that matter, and finish with a summary and a short differential where something is abnormal.

Order of a spoken case. Use this sequence: gestation and parity; the woman's general state and symptoms; blood pressure and urine; abdominal inspection and fundal height; lie, presentation, engagement and liquor; fetal heart rate; then the summary and plan.

Wording. Keep sentences short and factual, in the same order every time. A normal antenatal visit sounds like: "This is a 30-year-old woman at 32+4 weeks, para 1, who is well with no symptoms. Her blood pressure is 118/74 mmHg and her urine dipstick is negative for protein. The abdomen is soft and symmetrical; symphysis-fundal height is 32 cm, consistent with dates. The fetus is in a longitudinal lie, cephalic, left occipito-anterior, with three-fifths of the head palpable above the brim, and the liquor is clinically normal. The fetal heart is 142 beats per minute and regular. In summary, this is a reassuring routine antenatal assessment at 32 weeks; no concerns today." Abnormal presentations begin the same way but state the headline first: "The important finding today is that the fundal height measures 38 cm at 34 weeks, with clinical features of polyhydramnios."

Leading with the most important finding means that any abnormal result appears before the normal routine observations are finished: raised blood pressure first, then a small or large fundal height, then malpresentation, then reduced fetal movements.

Stating negatives that matter means recording that the woman has no headache, visual disturbance, epigastric pain or neurological symptoms in a hypertensive woman; no contractions or bleeding with a malpresentation; no reduced fetal movements when that risk exists; and no abdominal tenderness or hepatomegaly where relevant.

Ending with a summary and a differential means closing every case presentation with a one-sentence summary and, when something is abnormal, a short list of likely causes and what is needed to decide between them. For example, a large fundal height differential includes a large-for-dates fetus, polyhydramnios, a multiple pregnancy that was missed or a wrong date; a small fundal height differential includes a small-for-dates fetus, oligohydramnios, inaccurate gestational age or maternal factors.

Writing in the notes uses the same elements in the same order, abbreviated but complete: date, time, gestation, observer, maternal pulse and blood pressure, urine result, SFH and chart reference, lie, presentation, engagement in fifths, position, liquor, fetal heart rate and rhythm, oedema and reflexes where performed, summary, plan and signature. Every abnormal finding is followed by the action taken, not just the finding.

The following examples use invented patient details and are illustrative. They show a spoken line and a written note for the same woman.

Normal antenatal assessment at 32 weeks. (Illustrative.) Spoken: "Mrs Taylor, 30 years old, para one, is at 32+4 weeks and is well with no symptoms. Her blood pressure is 118/74 mmHg, pulse 76 per minute, and her urine dipstick is negative for protein. The abdomen is soft and symmetrical, with no scars. Symphysis-fundal height is 32 cm, consistent with dates and plotted on the growth chart. The fetus is in a longitudinal lie, cephalic, left occipito-anterior, with three-fifths of the head palpable above the pelvic brim. The liquor is clinically normal, fetal movements are felt normally, and the fetal heart is 142 beats per minute, regular. In summary this is a reassuring routine antenatal visit with no concerns identified today." Written note: "32+4 weeks, G2P1, booking blood pressure 118/74, pulse 76, urine protein negative. SFH 32 cm plotted. Lie longitudinal, presentation cephalic, L.O.A., 3/5 palpable. Liquor clinically normal. FH 142 regular. Summary: normal visit. Plan: routine antenatal care, next visit in 2 weeks."

Suspected breech with polyhydramnios at 38 weeks. (Illustrative.) Spoken: "The important finding today is that Mrs Khan, at 38+1 weeks, is clinically large for dates. Her blood pressure is 126/82 mmHg and urine dipstick is negative for protein, with no headache or visual symptoms. On abdominal examination the symphysis-fundal height is 41 cm; the fetus is in a longitudinal lie but the presenting part feels soft and irregular at the fundus, with a hard, rounded head palpable in the right upper quadrant, and only a small firm area is felt above the pelvic brim. The uterus is tense and the fetus is difficult to outline, with excess liquor suspected. The fetal heart is 148 beats per minute. In summary this is a suspected breech presentation with polyhydramnios at term; the likely explanations are a breech fetus with excess liquor or an undiagnosed multiple pregnancy, and an ultrasonography scan today will confirm presentation, liquor volume and fetal size; if breech is confirmed, options including external cephalic version and mode of delivery will be discussed." Written note as above, with "suspected breech, excess liquor; USS arranged; patient informed."

Small fundal height with reduced fetal movements at 34 weeks. (Illustrative.) Spoken: "Mrs Osei, para 0, at 34+0 weeks reports fewer fetal movements since yesterday. Her blood pressure is 132/88 mmHg, urine dipstick negative for protein, with no headache or visual disturbance. Symphysis-fundal height measures 30 cm, four centimetres less than expected, and on palpation the fetal parts are easily felt and the uterus is soft, with oligohydramnios suspected. The fetus is longitudinal, cephalic, left occipito-anterior, with five-fifths of the head palpable and no engagement. The fetal heart is 152 beats per minute. In summary this is a small-for-dates pregnancy with clinically low liquor and reduced movements; the two leading concerns are a small or growth-restricted fetus with oligohydramnios and inaccurate dating, and ultrasonography for growth, liquor and umbilical Doppler is needed today; in the meantime I will ask for a cardiotocograph and arrange clinician review." Written note records findings and actions.

• Not differentiating fetal from maternal pulse. Listening to the maternal heartbeat and calling it fetal is a serious error. Always palpate the woman's radial pulse while listening, and if there is any doubt use the Doppler position or scan.
• Performing Leopold manoeuvres with a full bladder or a tense abdomen. Either makes every grip unreliable. Ask the woman to empty her bladder and to relax the abdomen before you start.
• Taking one measurement, one visit. Symphysis-fundal height is a screening trend, not a single value. Plot every measurement on a chart and act on a trend that crosses centiles or on a clear discrepancy with dates.
• Calling presentation from one grip. All four grips are needed to decide lie, presentation and engagement; the pelvic grip alone is the least reliable part of the sequence.
• Over-trusting palpation for breech. Abdominal palpation is good but not diagnostic for malpresentation, especially with obesity, polyhydramnios or an anterior placenta. Suspected non-cephalic presentation after 36 weeks must be confirmed with ultrasonography. ^[1][3]
• Forgetting blood pressure and urine. Recording an examination without blood pressure or urine protein is incomplete and unsafe; both are required at every routine face-to-face visit. ^[1]
• Recording vague terms. "Head down" and "normal growth" cannot be audited. Use the standard words (cephalic, breech, transverse; engagement in fifths; SFH in centimetres plotted) so that the next clinician knows exactly what you found.
• Ignoring maternal symptoms. A raised fundal height matters far less than a woman with a headache and epigastric pain. Always take the symptom history before the tape measure.
• Not stating the negatives. A presentation that lists only positive findings forces the listener to fill in the gaps. Record "no headache, no visual disturbance, no epigastric pain" explicitly.
• Assuming engagement means spontaneous onset of labour. A head that is engaged before labour is a reassuring sign, particularly in a nulliparous woman, but it is neither a promise of labour nor a guarantee of vaginal birth.
• Using clinical weight estimates alone. Leopold-based estimates of fetal weight overestimate birth weight in 58.2 percent of patients and underestimate in 41.2 percent, so corroborate any weight estimate that changes management with ultrasonography. ^[4]

• An obstetric abdominal examination combines maternal observations with inspection, symphysis-fundal height, Leopold manoeuvres, presentation, engagement, liquor assessment and fetal heart auscultation at every antenatal visit.
• Measure and record blood pressure with a device validated in pregnancy and offer urine dipstick for protein at every routine face-to-face antenatal appointment; 140/90 mmHg or higher is hypertension and 160/110 mmHg or higher is severe hypertension. ^[1][2]
• Offer symphysis-fundal height measurement at each appointment after 24+0 weeks (NICE) and from the first prenatal visit onward (AAFP recommends from 20 weeks); plot it on a growth chart and refer a concerning trend for ultrasonography. ^[1][3]
• Offer abdominal palpation after 36+0 weeks to detect possible breech presentation, and confirm any suspected non-cephalic presentation with ultrasonography. ^[1][3]
• Leopold manoeuvres are four systematic grips: fundal, lateral or umbilical, Pawlik and pelvic. They assess lie, back position, presentation and engagement. ^[4]
• Breech occurs in 3 to 4 percent of deliveries and is the commonest malpresentation. ^[4]
• A normal fetal heart rate is 110 to 160 beats per minute; differentiate it from the maternal pulse at every assessment. ^[6]
• Express engagement in fifths palpable above the pelvic brim; zero-fifths means engaged. Mid-cavity or pelvic station is defined relative to the ischial spines (station zero at engagement, 5 cm below positive, 5 cm above negative). ^[8]
• Polyhydramnios makes the uterus large and tense and the fetus hard to feel; oligohydramnios makes it small and soft and the fetus easy to feel. Confirm both with ultrasonography.
• Maternal symptoms (headache, visual disturbance, epigastric pain) and signs (raised blood pressure, proteinuria, hyperreflexia) outweigh any single abdominal finding; pre-eclampsia is a syndrome, not a blood pressure number alone. ^[2]
• Leopold-based estimates of fetal weight overestimate in 58.2 percent and underestimate in 41.2 percent of patients, so corroborate with ultrasonography. ^[4]
• Present findings in the standard order (gestation, observations, inspection and fundal height, lie, presentation, engagement, liquor, fetal heart), lead with the most important finding, state the negatives that matter and finish with a summary and a differential.