How Pelvic Floor Progress Is Measured: Diaries, Pad Tests, Scores and Sensors

Progress in pelvic floor physiotherapy is measured in two different currencies, what the symptom does and what the muscle does, and the two are recorded with different tools that frequently disagree with each other. A bladder diary and a pad test count leakage. A symptom score puts a number on how bothered you are. A graded examination, a pressure sensor or an ultrasound describes the muscle itself. A course is judged on the first group. The second group is how the clinician decides what to change.

The number I was first shown was a muscle number, from a pressure sensor, and for six weeks it refused to move while my running quietly changed. I did not understand at the time that those were two different measurements answering two different questions. This page is the explanation I would have liked in week one, and it sits alongside what happens at a pelvic health physio assessment, which covers the appointment where the first measurement is taken.

What “progress” means, and why it is two things

Progress means the symptom is happening less, later or with less bother, and separately that the muscle is contracting better than it did. Those are not the same event, and the guideline structure treats them as distinct. NICE NG210 recommendation 1.6.18 asks for at least 1 review to assess progress during a supervised programme and 1 review at the end, and its supervised minimum for stress or mixed urinary incontinence is at least 3 months¹. A review assesses progress; it does not specify which currency, and a good one uses both.

The reason it matters is that the trials that justify the treatment were counted in symptoms. The Cochrane review of pelvic floor muscle training against no treatment, placebo, sham or another inactive control reported cure in 56% of women with stress urinary incontinence against 6% of controls, from 4 trials and 165 women, at high certainty, and cure or improvement in 74% against 11%, from 3 trials and 242 women². Nobody was cured of a low squeeze reading. They were cured of leaking. So when a reader asks whether it is working, the symptom measure is the one that answers the question, and the muscle measure is the one that explains the answer.

The diary: the count you can keep yourself

A bladder or bowel diary is the most repeatable symptom measure in the whole field, because it costs nothing and you can do it again in a month. Over three days it records what you drank and when, when you went, how much, and the exact moment any leak happened and what you were doing. At the assessment it converts “I leak when I run” into a count; at the review it converts “I think it is a bit better” into a comparison.

Counts are what the evidence is built on. The Cochrane review reported leakage episodes per 24 hours as one of its outcomes: 1.23 fewer episodes a day with training in stress urinary incontinence, with a 95% confidence interval of 1.78 to 0.68 fewer, from 7 trials and 432 women, graded moderate certainty; across all types of incontinence, 1.00 fewer, from 4 trials and 349 women². That is the same measurement a three day diary gives you, at your own kitchen table.

Two cautions belong here. A diary is only comparable to itself if it is kept the same way each time, including the days you would rather leave out. And the most useful column is often the one nobody tells you to add: not whether the leak happened but at what point in the activity it did. In my own course the first real change was that the leak arrived later in a run, weeks before it arrived less often, and a yes or no diary would have missed it entirely. Sixteen weeks of pelvic floor exercises is the week by week version of that.

The pad test: leakage by weight

A pad test measures leakage as a weight gain in grams, from a pad worn either for a fixed period or through a fixed set of activities such as coughing, jumping and walking. It is the objective outcome trials reach for when they want to remove self-report from the equation, and its threshold decides what “cured” means.

One review of the field states that there is Level 1, Grade A evidence for pelvic floor muscle training in stress urinary incontinence, with short-term cure rates assessed as less than 2 g of leakage on pad testing varying between 35% and 80%, and that supervised and more intensive training is more effective than unsupervised³. The spread from 35% to 80% is not sloppiness in the trials. It is what happens when the protocol, the population and the pad rule differ from one study to the next, and it is the reason this site writes every figure with its definition attached.

Clinic use varies a great deal. Some services use a pad test at assessment and review, many rely on the diary and a questionnaire instead, and neither approach is wrong provided the same tool comes out at both ends of the course. Whether your service uses one is a fair question for the first appointment, and it sits naturally with the ones in questions to ask at your first appointment.

The definition problem, with the clearest example in the field

Men after prostate surgery are where the measurement question is starkest, because “continent” has no fixed meaning there. A systematic review of 51 studies of robot-assisted radical prostatectomy found that at 12 months, 4% to 31% of men were incontinent, a mean of 16%, when the rule was no pad at all, and 8% to 11%, a mean of 9%, when a single safety pad counted as continent⁴. Same men, same operation, nearly double the incontinence rate from a change in the definition and nothing else.

That is not a men’s issue; it is a measurement issue that men’s data happens to show most plainly. The same logic runs through every figure on this site. A woman told that a quarter of women leak and a woman told that far fewer do may be hearing two answers to two different questions, one counting any leakage and one counting only moderate to severe, and neither is wrong. What the prostate example adds is the practical rule: before comparing your own result with anybody else’s, or with a figure from a website, ask what counted as dry. Men’s pelvic health after prostate surgery carries the full evidence picture for that group, including the null Cochrane result that the definition problem helps to explain.

The symptom score: putting a number on bother

A symptom score is a validated questionnaire that turns how much a symptom affects you into a number that can be repeated. Prolapse is the clearest example because the biggest trial was built on one. The POPPY trial randomised 447 women with newly diagnosed symptomatic stage 1, 2 or 3 prolapse across 25 centres, 225 to individualised pelvic floor muscle training and 222 to a lifestyle advice leaflet, and its primary outcome was the Pelvic Organ Prolapse Symptom Score, a scale from 0 to 28, at 12 months⁵.

The result was a mean fall of 3.77 points with training against 2.09 with the leaflet, an adjusted difference of 1.52 points with a 95% confidence interval of 0.46 to 2.59, with 66% of the women still in the trial at 12 months⁵. That is good evidence that the treatment moves symptoms in the right direction and modest evidence about how far, and the house line here is that it must never be read as “physiotherapy fixes prolapse”. What it does show is why the score exists. A change of a point and a half on a 28 point scale is invisible to memory and visible to a questionnaire, which is exactly the kind of change a four month course produces.

Notice that the prolapse trial did not measure progress by stage. NICE NG123 sets the supervised course for symptomatic POP-Q stage 1 or 2 prolapse at a minimum of 16 weeks and defines the population by stage, but the thing that is expected to improve is the symptom⁶. A stage that stays the same while the heaviness eases is a course that worked by the measure the guideline cares about.

The muscle measures: examination, sensor, ultrasound

The muscle itself is measured in one of three ways, and each answers the same narrow question: is the contraction stronger, longer, faster or better coordinated than it was at baseline. The first is a graded assessment by hand during an internal examination, in which the clinician feels the strength, the hold and the release and records them on a grading scale. The second is a pressure sensor, a perineometer, which reads the squeeze as a number on a handset. The third is ultrasound, which shows whether the muscle lifts and whether the movement is in the right direction at all.

None of these is a symptom. A perineometer reading is a statement about muscle, and the review already cited is explicit that training needs proper instruction and close follow-up to be effective, which is the muscle measures’ actual job: to check that the movement being practised is the movement prescribed³. This is also where the counterweight lives. A short, guarded, overactive pelvic floor can produce a low reading that looks like weakness, and strengthening it makes things worse; hypertonic pelvic floor and downtraining explains why the number cannot be interpreted without the examination that goes with it.

The first hand version of this, from my own course: at six weeks I watched the sensor reading fail to move while being certain I was doing something, and the same appointment established that I had run a club session in a way I could not have done in March. Muscle unchanged, symptom changed. At sixteen weeks the reading had moved and the diaries had moved further. Neither measurement was wrong at either point. They were describing different things at different speeds, and had I only been shown one of them I would have stopped in April.

What a review is for, and what it is not

A review is a second measurement compared with a written first one, followed by a decision about the programme. NICE NG210 requires at least one during the supervised programme and one at the end, and separately says to continue an exercise programme if it is beneficial, which is a judgement that can only be made against a baseline¹. NG123 puts the same requirement for stress and mixed urinary incontinence and adds that the programme should comprise at least 8 contractions performed 3 times per day, a dose carried forward unchanged from 2006 and not re-reviewed in 2019⁶.

A review is not a verdict on you, and it is not a strength test you can pass or fail. Its output is a changed prescription, a continued one, or a decision that the fair trial is complete. If you reach the end of a course and the starting measure was never repeated, the programme was not reviewed in the sense the guideline means, and asking for that measurement is a reasonable request rather than an awkward one.

What this page cannot tell you

It cannot tell you which measure your service uses, what your own numbers mean, or whether a reading that has not moved is a problem. A low reading can be weakness, guarding or technique error, and telling those apart is an examination, not a paragraph. What it can give you is the vocabulary to ask three questions at your first appointment: what is being measured, when it will be measured again, and which of the two currencies the answer will be in.