The prostate exam

Abstract

Objective: To help students, residents, and general practitioners to improve the technique, skills, and reproducibility of their prostate examination.
Methods: We developed a comprehensive guideline outlining prostate anatomy, indications, patient preparation, positioning, technique, findings, and limitations of this ancient art of urological evaluation.
Results: The prostate exam was the first diagnostic test used for prostate cancer screening and other urological conditions. Although several alternative procedures have been developed in the past century, the prostate exam is still an important part of genital–pelvic evaluation because of its simplicity, cost and time effectiveness, and relatively minimal patient discomfort experienced.
Conclusion: With an aging population and increasing incidence of prostate diseases, it is imperative that healthcare professionals possess the knowledge, skills, and attitudes to make the prostate exam a routine part of a complete physical examination.

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Health Education Journal
71(2) 239 –250
© The Author(s) 2011
Reprints and permission: sagepub.
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DOI: 10.1177/0017896911398234
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Article
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e
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398234
HEJXXX10.1177/0017896911398234Romero et al.Health Education Journal
Corresponding author:
Frederico R Romero, 653 Emiliano Perneta St apartment 41, Curitiba, PR, Brazil 80420-080
Email: frederico.romero@gmail.com
The prostate exam
Frederico R Romero
a,b,c,d
, Antonio W Romero
b
,
Thadeu Brenny Filho
a,c
, David Kulysz
c
, Fernando
C Oliveira Jr
d
and Renato Tambara Filho
a
a
Universidade Federal do Paraná, Brazil
b
Hospital Policlínica Cascavel, Brazil
c
Hospital São Vicente de Curitiba, Brazil
d
Instituto Curitiba de Saúde, Brazil
Abstract
Objective: To help students, residents, and general practitioners to improve the technique, skills, and
reproducibility of their prostate examination.
Methods: We developed a comprehensive guideline outlining prostate anatomy, indications, patient
preparation, positioning, technique, findings, and limitations of this ancient art of urological evaluation.
Results: The prostate exam was the first diagnostic test used for prostate cancer screening and other
urological conditions. Although several alternative procedures have been developed in the past century, the
prostate exam is still an important part of genital–pelvic evaluation because of its simplicity, cost and time
effectiveness, and relatively minimal patient discomfort experienced.
Conclusion: With an aging population and increasing incidence of prostate diseases, it is imperative that
healthcare professionals possess the knowledge, skills, and attitudes to make the prostate exam a routine
part of a complete physical examination.
Keywords
benign prostatic hyperplasia, diagnosis, differential, digital rectal examination, prostatic neoplasms,
rectal palpation
Introduction
The prostate exam, called a digital rectal exam (DRE), or rectal examination in recent medical
literature, has been used for centuries under the Latin term palpatio per anum or examination per
rectum. Legend has it that Petroncellus of Salerno used the DRE to diagnose cancer in the 11th
century, although it is not clear whether the cancer was rectal or prostatic;
1
and it was the only
available diagnostic test for prostate cancer before 1920.
2
Since then, diagnostic procedures have

240 Health Education Journal 71(2)
increased in number, complexity, and expense, including prostatic acid phosphatase, carcinoem-
bryonic antigen, prostate specific antigen (PSA), human kallikrein 2, prostate specific membrane
antigen, transrectal ultrasound, isotope studies, and magnetic resonance imaging.
2
Although sev-
eral of these procedures were expected to replace DRE, to this day DRE stands as an important part
of genital–pelvic examination for the diagnosis of benign and malignant prostate diseases because
of its simplicity, limited invasiveness that is well tolerated, and time and cost efficiency.
An effective DRE requires a meticulous, thorough, and skillful examination technique that is
usually acquired only after a fairly long learning curve.
3
Although DRE is an essential part of any
complete physical examination, and a particularly important element of urological study, it has
only fair reproducibility in the hands of experienced examiners.
4
More practice and greater experi-
ence certainly contribute to exam expertise,
4
but sharing knowledge through lectures,
3
books, and
articles is a helpful and effective method for improving skills and accelerating experience.
5
For this
reason, we developed a detailed guideline reviewing prostate anatomy, exam indications, patient
preparation, patient positioning, technique, range of findings, and limitations of DRE to assist in
the teaching of medical students, residents, and general practitioners.
Anatomy
The prostate is a compound tubuloalveolar exocrine gland of the male reproductive system weigh-
ing an average of 20 to 30 grams and measuring 4 × 3 × 2cm.
6
The function of the prostate gland
is to store and secrete a slightly alkaline fluid, milky or white in appearance, that helps carry and
nourish sperm and constitutes about 25 per cent to 30 per cent of the volume of semen.
It is located in the pelvic cavity, below the lower part of the symphysis pubis, above the superior
fascia of the urogenital diaphragm, surrounding a segment of the urethra just below the urinary
bladder (prostatic urethra), and anterior to the rectum,
6
through which it may be reliably examined;
the posterior surface of the prostate is distant about 4cm from the anal verge, and only the
Denonvillier’s fascia and some loose connective tissue separate it from the examiner’s finger.
For purposes of description, the prostate can be divided into surfaces: base, apex, anterior,
posterior, and lateral surfaces; lobes: anterior (isthmus), median, posterior, and lateral lobes; or
zones: peripheral, central, transition, and anterior fibromuscular (or stroma) zones (Figure 1).
6
Indications
DRE should be performed on every male after age 40 and in men of any age who present for
urologic evaluation.
4
Specific indications are as follows:
Prostate cancer screening
Given the uncertainty about the benefits of population-based screening, several medical agencies
and organizations around the world support informed decision making about prostate cancer screen-
ing, providing individual patients with current information about the benefits and risks of screening –
including overdiagnosis and overtreatment – so that each man can make his own decision.
For those well-informed men who wish to be tested for prostate cancer, it is recommended that
screening with DRE and serum PSA determination should be offered annually beginning at age 45
to men who have at least a 10-year life expectancy. African American men and/or those with one
or more first degree relatives (father or brothers) diagnosed with prostate cancer before age 65
should begin screening at age 40.

Romero et al. 241
Lower urinary tract symptoms
DRE is important in the differential diagnosis of lower urinary tract symptoms. It may provide
clues toward the diagnosis of benign prostatic hyperplasia (BPH), prostate cancer, prostatitis, and
neurogenic disease. When programming surgical treatment for BPH, DRE may indicate what type
of surgical therapy is warranted (open or endoscopic treatment) based upon prostate size.
4
Staging of prostate cancer
The tumor, node, metastasis (TNM) staging system for prostate cancer is summarized in Figure 2.
7
Unknown primary neoplasm with signs of metastatic disease
Although prostate cancer rarely presents as unknown primary carcinoma, patients with blastic
skeletal metastases, suspicious DRE, and/or elevated PSA should be investigated for prostate
cancer.
8
Figure 1. Anatomy of the prostate gland. Anatomical zones of the prostate: anterior fibromuscular zone
(red); transition zone (light blue); central zone (yellow); peripheral zone (dark blue) – note that most of the
peripheral zone is available for examination through the rectum.

242 Health Education Journal 71(2)
Urethral injury after pelvic fracture
When urethral disruption is suspected, DRE is mandatory, as it may reveal a ‘high-riding’ prostate,
or blood in the stool in the presence of associated rectal injury.
4
Active surveillance for prostate cancer
Monitoring prostate cancer post-radical prostatectomy
Figure 2. Clinical staging of prostate cancer. T1c: Tumour identified by prostate needle biopsy due to
elevation in PSA only. The tumour is clinically inapparent, neither palpable by DER nor visible by imaging;
T2: Tumour confined within prostate; T2a:Tumour involves one-half of one lobe of the prostate or less;
T2b:Tumour involves more than one-half of one lobe of the prostate, but not both lobes; T2c: Tumour
involves both lobes of the prostate; T3: Tumour extends through the prostatic capsule: T3a: Extracapsular
extension (unilateral or bilateral) including microscopic bladder neck involvement; T3b: Tumour invades
seminal vesicle(s); T4: Tumour is fixed or invades adjacent structures other than seminal vesicles: external
sphincter, rectum, levator muscles, and/or pelvic wall.

Romero et al. 243
Contraindications
Unwilling patient
The rejection rate to DRE during prostate cancer screening was 8.2 per cent in one study.
9
Reasons
for refusing DRE include absence of urological complaints, misconception that DRE adds nothing
further to PSA testing especially if PSA is very low, lack of family history for prostate cancer, no
previous history of DRE, anticipated pain and discomfort, fear of finding a cancer, and social and
cultural beliefs.
9
Patients unwilling to undergo DRE should be scheduled for return visits and
offered DRE in future consultations.
Latex allergy (use latex-free gloves)
Recent anal surgery or trauma
Recent myocardial infarction or intracranial hemorrhage
Severe rectal pain
Patient positioning
The most commonly advised positions for DRE are illustrated in Figure 3. Preferences vary indi-
vidually according to each physician and their patients. In Brazil, more than half of urologists
prefer examining their patients in the modified lithotomy position.
10
In the United States (US),
DRE is more often performed in the standing-up position, while patients in the United Kingdom
(UK) are usually examined in the left lateral position.
11
Frank et al compared the preference of
patients between the standing position and the left-lateral position and found better patient accep-
tance with the standing up position.
12
Furlan et al reported that more than half of their patients
preferred the modified lithotomy position.
13
Despite preferences and potential advantages of each position, there is little evidence to suggest
that positioning of the patient makes much difference in the diagnostic yield of DRE.
11
In some
patients, however, especially in the presence of obesity, an exaggerated flexion of knees/hips may
be necessary to allow for complete palpation of the prostate. In bedridden or very sick patients,
DRE may be performed satisfactorily in dorsal decubitus, with the knee close to the examiner
flexed and abducted; or in the lateral (Sims’) position, with the upper knee flexed toward the
patient’s abdomen/chest.
14
Patient instructions
Administering an effective DRE requires the integration of interpersonal, psychomotor, and
cognitive skills involving adequate patient–physician rapport and communication, clear patient
orientation and instruction about each part of the examination, and feedback to the patient
regarding the findings of the examination.
3,5
It is important to make the patient feel comfortable by performing DRE in a warm and reserved
exam room with a toilet available if necessary, asking patient consent and informing previously
how he will be positioned, and how the examination will occur. The patient should be informed
what to expect, and the steps of examination should be explained to him while they are being
performed.
3,9

244 Health Education Journal 71(2)
Patients should empty their bladder before DRE because, if it does not relieve the discomfort,
15
a distended bladder may falsely indicate prostate enlargement,
14
especially when performing
bimanual examination.
16
After positioning, the patient is asked to breathe out slowly to relax the rectal sphincter muscle
and is informed that a lubricated gloved finger will be introduced through his rectum to determine
any irregularities on the prostate gland. He should be advised that mild to moderate discomfort
may occur and that the urge to urinate is not unusual.
15
The findings of examination are described to the patient, avoiding medical terms or language
that he may not understand. This helps minimize physical and emotional discomfort, and allays
patient anxiety. The patient should be advised before withdrawing the examining finger, and the
colour of any fecal matter on the glove is documented.
3
After the exam, tissue for removing jelly is offered, and the patient is asked if he wants to use
the toilet before discussing the findings of the examination.
3
Examination technique
Before performing DRE, the buttocks are gently spread apart and the sacrococcygeal and perianal
areas are inspected for pathology such as melanoma, condilomas, anal fissures or fistulae, external
hemorrhoids, anal prolapse, anal eczema, and bacterial or mycotic infection.
3,11,14
Figure 3. Patient positioning. (1) Left-lateral position: patient on his left-side with legs flexed toward the
abdomen/chest; (2) Modified lithotomy position: patient lies on the back with his knees flexed, and hips
flexed and abducted (variant of the lithotomy – or Loyd-Davis – position); (3) Standing-up position: patient
standing up with heels slightly apart, toes turned in, and body leaning over the examining table on the
elbows (variant of the standing elbow-knee position); (4) Kneeling while resting on the table with the hands
(or elbows) (variant of the exaggerated knee-chest position).

Romero et al. 245
The fingertip of the examiner is positioned at the entrance of the anus for a few seconds, apply-
ing gentle pressure against the anal sphincter reflex contraction. After the sphincter relaxes, when
the patient is breathing out slowly, the examiner finger is slowly inserted all the way into the rec-
tum with a slight rotation movement, and the entire circumference of the rectum is examined for
any areas of irregularity in the rectal mucosa (internal hemorrhoids, rectal fistulae, polyps or car-
cinoma), and then pulled back to feel the prostate in the anterior rectal wall. Estimation of anal
sphincter tone is of great importance. A flaccid or spastic anal sphincter suggests similar changes
in the urinary sphincter and may be a clue to the diagnosis of neurogenic disease.
4,11
The patient
can be steadied by the examiner’s free hand,
17
which can also provide gentle counter pressure when
necessary. The fingertip is positioned in the longitudinal groove (median sulcus) between the two
lobes of the prostate and moved gently over one lobe before the other, mediolaterally and antero-
posteriorly, to determine the shape and size of the prostate, consistency, symmetry, nodularity,
sensitivity, and mobility.
17
Findings
Shape and size
The normal configuration of the prostate is somewhat conical, and is usually described as having a
chestnut, pear or heart shape, with an approximate weight of 20 to 30 grams. As the prostate grows
larger, it tends to assume an elliptical configuration,
18
but it can show very different enlargement
shapes caused by different patterns of lengthening along the three-dimensional prostate.
2
Even
prostates with the same size can show different enlargement shapes because of their different pro-
liferation characteristics,
2
resulting sometimes in asymmetric growth and intravesical projections.
The surface of the prostate is easily evaluated through DRE to determine the shape, whether
rounded or flat, the depth of the lateral sulci, changes in the median sulcus and median notch, the
accessibility of its upper limits to the tip of the examining finger, and the degree of its encroach-
ment into the rectum, all of which also indicate relative changes in prostate size (Figure 4).
4
Determination of prostate gland size and shape is important for BPH management since it influ-
ences the likelihood of having moderate to severe urinary symptoms, the risk of complications
such as urinary retention, and the response to 5-alpha-reductase inhibitors. It is also helpful in
surgical planning prior to transurethral or retropubic prostatectomy, brachytherapy, and radical
prostatectomy.
18,19
DRE is well known to underestimate large prostates and overestimate small glands.
19
Prostate
size may be inaccurately assessed through DRE when prostate lobe protrusion occurs preferen-
tially into the bladder or anteriorly toward the prevesical space. The size of prostate lobes on DRE
is not a criterion as to the size of their protrusion into the bladder. When only the median lobe is
enlarged, prostate assessment through DRE may be normal.
16
These shortcomings may occasion-
ally be overcome by alterations in the position of the patient and by making the examination
bimanual.
16
Transrectal ultrasound has been used as the criterion standard adopted for comparisons
of prostate size estimation.
18,19
Although DRE can only approximately determine prostate shape
and size, the degree of prostatic enlargement is of more practical interest than the precise estimate
of prostate volume.
19
Consistency
The consistency of the prostate may be elastic, hard, boggy, soft or fluctuant. The consistency of a
normal prostate or an enlarged benign prostate is elastic or rubbery, similar to the consistency of
the thenar eminence of a hand closed in a tight fist with the thumb folded into the palm (Figure 5).

246 Health Education Journal 71(2)
A hard consistency is the same of the consistency of the knuckle of the thumb (Figure 5), and it
may be present as a discrete nodule, focal induration, or a diffusely hard prostate. A boggy consis-
tency is similar to that of the thenar eminence when the fist is closed but relaxed. It may be palpable
on BPH depending on the proportion of hypertrophied – glandular versus stromal – elements;
when it is congested due to sexual abstinence or chronic inflammation with drainage deficiency; in
acute prostatitis, when it is also exquisitely tender to touch and warm; and in prostatic sarcoma.
14
A localized soft or fluctuant region may represent a prostatic or perirectal abscess, for which surgi-
cal drainage is required.
4,14
Symmetry
The halves of the prostate should be symmetric in both size and consistency.
20
While carcinomas
arising in the transitional zone of the prostate often manifest as ‘incidental’ prostate cancers at
transurethral or retropubic prostatectomy,
11,21
subtle findings such as asymmetry between prostate
Figure 4. Determination of prostate size. (A) Normal prostate, Grade I (approximately 20g): Flat or
slightly rounded surface, median sulcus usually unnoticed or shallow, superficial depth of lateral sulci,
with approximately one fingertip length anteroposteriorly, and one fingertip mediolaterally; (B) Grade I/
II prostate (approximately 30g): Surface of the prostate between Grade I, and Grade II; (C) Grade II
(approximately 40g): Bilobar rounded surface, well-delimitated median sulcus, superficial/intermediary
depth of lateral sulci, with approximately two fingertips of length anteroposteriorly, and one/one and a half
fingertip mediolaterally (above), or one fingertip length anteroposteriorly, and two fingertips mediolaterally
(below); (D) Grade II/III (approximately 50g): Rounded surface, partial obliteration of the median sulcus,
intermediary depth of lateral sulci, with approximately the same length of a Grade II prostate (above),
or an asymmetric surface with one lobe Grade II, and the other lobe Grade III (below); (E) Grade III
(approximately 60g): Rounded surface, complete obliteration of the median sulcus, intermediary/deep
depth of lateral sulci, with two fingertips anteroposteriorly, and two fingertips mediolaterally; (F) Grade IV
(approximately 80g or greater): Rounded surface, complete obliteration of the median sulcus, deep depth of
lateral sulci, with no accessibility of the upper limits of the prostate to the tip of the examining finger.

Romero et al. 247
lobes may also be suggestive of the presence of prostate cancer. For this reason, some consider
prostate asymmetry as though it were a nodule, and an independent indication for prostate biopsy.
22
On the other hand, Hansen Jr. et al reported that an asymmetric prostate showed no increased risk
of prostate cancer when compared with a normal DRE, concluding that observation without biopsy
is safe in these patients. In the presence of elevated PSA, an asymmetric prostate would have inter-
mediate cancer detection rates between those for a normal and a suspicious DRE.
23
Nodularity
Prostate surface should be evaluated for smoothness, irregularity or nodulation. A normal prostate
or an enlarged benign prostate surface should be smooth and regular. Prostate cancer usually pres-
ents as a stony hard nodule that is palpable on the periphery of the gland. The majority of prostate
cancers arise from within the peripheral zone of the prostate, which comprises the posterior surface
of the gland including the apical, lateral, posterolateral and anterolateral portions of the prostate. It
is fortuitous that this part of the gland is accessible and hence is more likely to be palpable by DRE
(Figure 1).
11,24
Although an abnormal DRE may suggest the presence of prostate cancer, cancer can only be
confirmed by the pathologic examination of prostate tissue (transrectal ultrasound-guided prostate
biopsy).
11,21
Mean positive predictive value for DRE (i.e. the proportion of men with a positive
DRE who actually have prostate cancer) is approximately 34 per cent. This means that when a
Figure 5. Prostate consistency.

248 Health Education Journal 71(2)
patient has abnormal DRE findings, the chance of having cancer is roughly one out of three.
25
Differential diagnosis include peripheral-zone calcifications, which are a common feature of BPH
associated with chronic inflammation, especially granulomatous prostatitis;
11
midline prostatic
cysts, usually due to seminal vesicle/ejaculatory duct anomalies (remnants of the Müllerian duct
system); prostatic calculi; prostatic infarction; or a rectal wall phlebolith, polyp or tumour.
11
Nodules in the base of the prostate should be distinguished from a unilaterally distended seminal
vesicle.
Tenderness
Several medical conditions may produce tenderness during DRE including anal stenosis, fissure,
abscess and fistula, proctitis, prostatitis and prostatic abscess.
11,15
In the absence of organic disease,
tenderness and discomfort may result from poor lubrication, which causes unnecessary friction
between the gloved finger and the dry, sensitive rectal mucosa, and painful pulling of hair in the
perianal region
14
; anal sphincter reflex contraction; and pressure to the prostate, seminal vesicles
and bladder trigone, which are innervated by afferent branches of the visceral nervous system that
transmit sensations of pain to branches of both the parasympathetic and sympathetic divisions of
the autonomic nervous system.
15
Romero et al reported that 61 per cent of patients undergoing DRE for prostate cancer with no
clinical evidence of urinary tract infection or prostatitis complained of moderate to unbearable
pain.
15
Mobility
The prostate may be fixed in position by lateral adhesions following inflammatory/infectious
disease, trauma, surgery, radiotherapy and/or hormone therapy, extraglandular infiltration in the
presence of advanced prostate cancer, or it may be freely movable.
17
Limitations
The limitations of DRE have been described at length and are generally well recognized.
16
Until
1980, DRE was the most efficient test for the diagnosis of prostate cancer.
2
Since the introduc-
tion of PSA for clinical use in 1985–6, there has been an observed increase in detection rates of
prostate cancer and a higher proportion of early-stage disease at diagnosis compared with DRE-
based screening. In both screened and non-screened populations, DRE misses 23 per cent to 45
per cent of prostate cancers that are subsequently found with biopsies done for serum PSA eleva-
tions.
4
These results reflect to some extent the high subjectivity, interindividual variability, and
poor reproducibility of DRE;
4,11
the population studied (screening versus routine practice), since
one might expect better performance criteria for DRE in patients seeking consultation because
of lower urinary tract symptoms; and the stage of disease, because the certainty of diagnosis by
DRE increases directly in proportion with the staging of prostate cancer.
21
Further, Nagler et al
argued that DRE is a significant barrier to participation in prostate cancer screening and it may
decrease prostate cancer detection rates by excluding nearly one quarter of potential partici-
pants.
26
In prostate cancer staging, DRE can both overestimate and underestimate the extent of
disease.
4
The majority of palpable cancers are not early cancers and many clinically-important
cancers are not palpable, especially those located in the transitional zone and anterior zone of the

Romero et al. 249
prostate. DRE, however, is most important to determine which tumours may be amenable to
excision.
Despite these limitations, it is still recommended that both DRE and PSA should be used during
prostate cancer screening because up to 25 per cent of men with prostate cancer have PSA levels
less than 4ng/ml.
4
DRE also detects more selectively high-grade (clinically significant) prostate
cancers, and an abnormal DRE improves positive predictive value of an elevated PSA.
27
Perspectives
Since the beginning of prostate cancer screening, healthcare providers have been searching for a
procedure to replace DRE as a diagnostic tool to avoid discomfort, embarrassment and masculinity-
related barriers.
28
While several procedures have failed to do so thus far, some have yet to prove
whether they have better sensitivity, specificity, accuracy and precision at acceptable costs, while
avoiding overdiagnosis and overtreatment of potentially indolent prostate cancers. Recent advances
in genomics, proteomics, and cellular and molecular biology may improve how urologists diag-
nose and treat prostate cancer in the near future.
Conclusions
With an aging population and increasing incidences of prostate ailments, it is imperative that
healthcare professionals possess the knowledge, skills, and attitudes to make DRE a routine part of
a complete physical examination. DRE is important in differential diagnosis of lower urinary tract
symptoms; it has important clinical and medico-legal implications in the suspicion of numerous
conditions; it may easily assess the degree of prostate enlargement; and, although not suitable as a
solitary screening tool, it increases both the chance of finding prostate cancer and detecting
clinically-significant disease.
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