The document outlines the procedures and preparations for conducting a vaginal examination during labor, emphasizing the importance of proper technique and hygiene. Key components include assessing the cervix, presenting part, and pelvis size, as well as identifying the state of membranes and monitoring fetal distress. Detailed descriptions of various presentations and positions of the fetus, along with guidelines for assessment, are provided to ensure effective management during labor.

1. 3B
Skills workshop:
Vaginal
examination in
labour
4. A suitable instrument for rupturing the
Objectives membranes.
5. An antiseptic vaginal cream or sterile
lubricant.
When you have completed this skills
An ordinary surgical glove can be used and
workshop you should be able to:
the woman does not need to be swabbed if the
• Perform a complete vaginal examination membranes have not ruptured yet and are not
during labour. going to be ruptured during the examination.
• Assess the state of the cervix.
• Assess the presenting part. B. Preparation of the woman for
• Assess the size of the pelvis. a sterile vaginal examination
1. Explain to the woman what examination is
to be done, and why it is going to be done.
PREPARATION FOR A 2. The woman needs to know that it will
be an uncomfortable examination, and
VAGINAL EXAMINATION sometimes even a little painful.
IN LABOUR 3. The woman should lie on her back, with her
legs flexed and knees apart. Do not expose
the woman until you are ready to examine
A. Equipment that should be available her. It is sometimes necessary to examine
for a sterile vaginal examination the woman in the lithotomy position.
4. The woman’s vulva and perineum are
A vaginal examination in labour is a sterile
swabbed with tap water. This is done by
procedure if the membranes have ruptured
first swabbing the labia majora and groin
or are going to be ruptured during the
on both sides and then swabbing the
examination. Therefore, a sterile tray is
introitus while keeping the labia majora
needed. The basic necessities are:
apart with your thumb and forefinger.
1. Swabs.
2. Tap water for swabbing.
3. Sterile gloves.

2. SK ILLS WORKSHOP : VAGINAL EXAMINATION IN LABOUR 55
C. Preparation needed by the examiner • Presentation or prolapse of the
umbilical cord.
1. The person to do the vaginal examination
3. A speculum examination, NOT a digital
must have either scrubbed or thoroughly
examination, must be done if it is thought
washed his/her hands.
that the woman has preterm or prelabour
2. Sterile gloves must be worn.
rupture of the membranes.
3. The examiner must think about the
findings, and their significance for the
woman and the management of her labour. THE CERVIX
PROCEDURE OF When you examine the cervix you should
observe:
EXAMINATION
1. Length.
2. Dilatation.
A vaginal examination in labour is a
systematic examination, and the following
should be assessed: E. Measuring cervical length
1. Vulva and vagina. The cervix becomes progressively shorter
2. Cervix. in early labour. The length of the cervix is
3. Membranes. measured by assessing the length of the
4. Liquor. endocervical canal. This is the distance
5. Presenting part. between the internal os and the external os
6. Pelvis. on digital examination. The endocervical
canal of an uneffaced cervix is approximately
Always examine the abdominal before 3 cm long, but when the cervix is fully effaced
performing a vaginal examination in labour. there will be no endocervical canal, only a
ring of thin cervix. The length of the cervix is
An abdominal examination should always be measured in centimetres. In the past the term
‘cervical effacement’ was used and this was
done before a vaginal examination.
measured as a percentage.
F. Dilatation
THE VULVA AND VAGINA
Dilatation must be assessed in centimetres,
and is best measured by comparing the
D. Important aspects of the degree of separation of the fingers on vaginal
examination of the vulva and vagina examination, with the set of circles in the
labour ward. In assessing the dilatation of the
This examination is particularly important cervix, it is easy to make two mistakes:
when the woman is first admitted:
1. If the cervix is very thin, it may be difficult
1. When you examine the vulva you should to feel, and the woman may be said to be
look for ulceration, condylomata, varices fully dilated, when in fact she is not.
and any perineal scarring or rigidity. 2. When feeling the rim of the cervix, it
2. When you examine the vagina, the is easy to stretch it, or pass the fingers
presence or absence of the following through the cervix and feel the rim with
features should be noted: the side of the fingers. Both of these
• A vaginal discharge. methods cause the recording of dilatation
• A full rectum. to be more than it really is. The correct
• A vaginal stricture or septum.

3. 56 INTRAPAR TUM CARE
Correct Incorrect
Figure 3B-1: The correct method of measuring cervical dilatation
method is to place the tips of the fingers on cord may prolapse. However, it is better
the edges of the cervix. for the cord to prolapse while the
hand of the examiner is in the vagina,
when it can be detected immediately,
THE MEMBRANES than to have the cord prolapse with
AND LIQUOR spontaneous rupture of the membranes
while the woman is unattended.
• HIV positive patients should not have
G. Assessment of the membranes their membranes ruptured unless there
is poor progress of labour.
Rupture of the membranes may be obvious if
2. What is the condition of the liquor when
there is liquor draining. However, one should
the membranes rupture?
always feel for the presence of membranes
overlying the presenting part. If the presenting The presence of meconium may change the
part is high, it is usually quite easy to feel management of the patient as it indicates that
intact membranes. It may be difficult to feel fetal distress has been and may still be present.
them if the presenting part is well applied to
the cervix. In this case, one should wait for a
contraction, when some liquor often comes THE PRESENTING PART
in front of the presenting part, allowing the
membranes to be felt. Sometimes the umbilical An abdominal examination must have
cord can be felt in front of the presenting part been done before the vaginal examination
(a cord presentation). to determine the lie of the fetus and the
If the membranes are intact, the following two presenting part. If the presenting part is the
questions should be asked: fetal head, the number of fifths palpable above
the pelvic brim must first be determined.
1. Should the membranes be ruptured?
• In most instances, if the woman is When palpating the presenting part on
in the active phase of labour, the vaginal examination, there are four important
membranes should be ruptured. questions that you must ask yourself:
• When the presenting part is high, there
is always the danger that the umbilical

4. SK ILLS WORKSHOP : VAGINAL EXAMINATION IN LABOUR 57
1. What is the presenting part, e.g. head, part is the head. However, on vaginal
breech or shoulder? examination:
2. If the head is presenting, what is the • Instead of a firm skull, something soft
presentation, e.g. vertex, brow or face is felt.
presentation? • The gum margins distinguish the
3. What is the position of the presenting part mouth from the anus.
in relation to the mother’s pelvis? • The cheek bones and the mouth form a
4. If the presentation is vertex, is moulding triangle.
present? • The orbital ridges above the eyes can
be felt.
H. Assessing the presenting part • The ears may be felt.
3. Features of a brow presentation. The
The presenting part is usually the head but presenting part is high. The anterior
may be the breech, the arm, or the shoulder. fontanelle felt is on one side of the pelvis,
1. Features of an occiput presentation. The the root of the nose on the other side, and
Figure 3B-2: Features of an occiput presentation Figure 3B-4: Features of a brow presentation
posterior fontanelle is normally felt. It is the orbital ridges may be felt laterally.
a small triangular space. In contrast, the If the presenting part is not the head, it could
anterior fontanelle is diamond shaped. If the be either a breech or a shoulder.
head is well flexed, the anterior fontanelle
will not be felt. If the anterior fontanelle can 4. Features of a breech presentation. On
be easily felt, the head is deflexed. abdominal examination the presenting
2. Features of a face presentation. On part is the breech (soft and triangular). On
abdominal examination the presenting vaginal examination:
Figure 3B-3: Features of a face presentation Figure 3B-5: Features of a breech presentation

5. 58 INTRAPAR TUM CARE
Left occipito-anterior (LOA) Right occipito-posterior (ROP)
Left mento-anterior (LMA) Left sacro-posterior (LSP)
Figure 3B-6: Examples of the position of the presenting part with the patient lying on her back
• Instead of a firm skull, something soft I. Determining the position
is felt. of the presenting part
• The anus does not have gum margins.
Position means the relationship of a fixed
• The anus and the ischial tuberosities
point on the presenting part (i.e. the point of
form a straight line.
reference or the denominator) to the mother’s
5. Features of a shoulder presentation. On
pelvis. The position is determined on vaginal
abdominal examination the lie will
examination.
be transverse or oblique. Features of
a shoulder presentation on vaginal The point of reference (or denominator) is:
examination will be quite easy if the arm
1. In a vertex presentation the point of
has prolapsed. The shoulder is not always
reference is the posterior fontanelle (i.e. the
that easy to identify, unless the arm can be
occiput).
felt. The presenting part is usually high.
2. In a face presentation the point of reference
is the chin (i.e. the mentum).

6. SK ILLS WORKSHOP : VAGINAL EXAMINATION IN LABOUR 59
Figure 3B-7: Lateral view of the pelvis, showing the examining fingers just reaching the sacral promontory
Normal pelvis Abnormal pelvis
Figure 3B-8: The brim of the pelvis.
3. In a breech presentation the point of J. Determining the descent and
reference is the sacrum of the fetus. engagement of the head
For example, if the posterior fontanelle (i.e. the Descent and engagement of the head is
fetal occiput) in a vertex presentation points assessed on abdominal and not on vaginal
upwards (anterior) and towards the mother’s examination.
left side the position of the presenting part is
called a left occipito-anterior position.

7. 60 INTRAPAR TUM CARE
Symphysis pubis
Sacrum
Ischeal tuberosity
Coccyx – not palpable
Figure 3B-9: The pelvic outlet
MOULDING L. Grading the degree of moulding
The sagittal suture is palpated and the
Moulding is the overlapping of the fetal skull relationship or closeness of the two adjacent
bones at a suture which may occur during patietal bones assessed. The amount of
labour due to the head being compressed as it moulding recorded on the partogram should
passes through the pelvis of the mother. be the most severe degree found in any of the
sutures palpated.
K. The diagnosis of moulding The degree of moulding is assessed according
In a cephalic (head) presentation, moulding is to the following scale:
diagnosed by feeling overlapping of the sagittal 0 = Normal separation of the bones with open
suture of the skull on vaginal examination, sutures.
and assessing whether or not the overlap can
be reduced (corrected) by pressing gently with 1+ = Bones touching each other.
the examining finger. 2+ = Bones overlapping, but can be separated
The presence of caput succedaneum can also with gentle digital pressure.
be felt as a soft, boggy swelling, which may 3+ = Bones overlapping, but cannot be
make it difficult to identify the presenting part separated with gentle digital pressure.
of the fetal head clearly. With severe caput the
sutures may be impossible to feel. 3+ is regarded as severe moulding.
M. Assessing the pelvis
When assessing the pelvis on vaginal
examination, the size and shape of the pelvic

8. SK ILLS WORKSHOP : VAGINAL EXAMINATION IN LABOUR 61
inlet, the mid-pelvis and the pelvic outlet must they are 3 cm or longer) and the spines are
be determined. small and round.
2. A small pelvis: The ligaments allow less
1. To assess the size of the pelvic inlet, the
than two fingers long and the spines are
sacral promontory and the retropubic area
prominent and sharp.
are palpated.
2. To assess the size of the mid-pelvis, the Step 3. Retropubic area
curve of the sacrum, the sacrospinous
Put two examining fingers, with the palm
ligaments and the ischial spines are
of the hand facing upwards, behind the
palpated.
symphysis pubis and then move them laterally
3. To assess the size of the pelvic outlet, the
to both sides:
subpubic angle, intertuberous diameter
and mobility of the coccyx are determined. 1. An adequate pelvis: The retropubic area
is flat.
It is important to use a step-by-step method to
2. A small pelvis: The retropubic area is
assess the pelvis.
angulated.
Step 1. The sacrum
Step 4. The subpubic angle and intertuberous
Start with the sacral promontory and follow diameter
the curve of the sacrum down the midline.
To measure the subpubic angle, the examining
1. An adequate pelvis: The promontory fingers are turned so that the palm of the
cannot be easily palpated, the sacrum is hand faces upward, a third finger is held at the
well curved and the coccyx cannot be felt. entrance of the vagina (introitus) and the angle
2. A small pelvis: The promontory is easily under the pubis felt. The intertuberous diameter
palpated and prominent, the sacrum is is measured with the knuckles of a closed fist
straight and the coccyx is prominent and/ placed between the ischial tuberosities.
or fixed.
1. An adequate pelvis: The subpubic angle
Step 2. The ischial spines and sacrospinous allows three fingers (i.e. an angle of about
ligaments 90 degrees) and the intertuberous diameter
allows four knuckles.
Lateral to the midsacrum, the sacrospinous
2. A small pelvis: The subpubic angle allows
ligaments can be felt. If these ligaments are
only two fingers (i.e. an angle of about
followed laterally, the ischial spines can be
60 degrees) and the intertuberous diameter
palpated.
allows only three knuckles.
1. An adequate pelvis: Two fingers can be
placed on the sacrospinous ligaments (i.e.