The NIH-CPSI Score Explained: What Your Number Means
The NIH Chronic Prostatitis Symptom Index, or NIH-CPSI, is a short questionnaire about your symptoms over the past week. It was developed in 1999 by Mark Litwin and colleagues for the US National Institutes of Health, and it's the standard measure used in CP/CPPS research and by many urologists. It has nine questions and takes a few minutes.
What it asks
- Pain or discomfort (questions 1 to 4): where you've had pain (the perineum, testicles, tip of the penis, or the pubic or bladder area), whether you've had pain when urinating or during or after ejaculation, how often, and how bad it's been on average.
- Urination (questions 5 and 6): how often you've felt your bladder hasn't fully emptied, and how often you've needed to go again within two hours.
- Impact and quality of life (questions 7 to 9): how much your symptoms have stopped you doing things, how much you've thought about them, and how you'd feel if they stayed as they are for the rest of your life.
How it's scored
The answers add up to three subscores and a total. Higher always means worse.
| Part | Range |
|---|---|
| Pain | 0 to 21 |
| Urinary symptoms | 0 to 10 |
| Quality of life impact | 0 to 12 |
| Total | 0 to 43 |
A common way to group the total is 0 to 14 as mild, 15 to 29 as moderate and 30 to 43 as severe. These bands are a rough guide used in some studies, not a diagnosis, and the same total can hide very different mixes of pain and urinary symptoms. That's why the three parts are worth looking at separately.
What counts as a real change
Symptoms go up and down, so a point or two either way usually means very little. Research on the questionnaire (Propert and colleagues, 2006) found that a drop of about 6 points in the total lines up with people saying they feel meaningfully better, and many treatment trials use a 6 point drop as the sign that something worked. A change smaller than that is worth watching, but not worth reading too much into on its own.
How often to take it
The questions cover the past week, so taking it every day mostly measures day to day noise. Every two to four weeks is enough to see a trend. Taking it just before starting a new treatment, and again a few weeks in, is especially useful because it gives you a clear before and after. Try to take it at a similar point each time, and make a note if that week was unusual, for example because of a flare or an illness.
Why it's worth tracking
- It turns "I think it's a bit better?" into a number that you and your doctor can compare over time.
- It shows which part is changing. Pain might improve while urinary symptoms don't, which can point towards a different next step.
- Urologists already know it. Bringing a few months of scores to an appointment saves time and gives a much clearer picture than memory alone.
If you're new to CP/CPPS, our guide to chronic prostatitis with no infection explains what the condition is and why antibiotics often don't help.
Take the NIH-CPSI and keep your scores in one place
Cypps includes the full NIH-CPSI, shows your pain, urinary and quality of life scores separately, reminds you when a retake is due, and keeps your history alongside your daily logs and flares.
Coming to the App Store soon.
This article is for general information and isn't a substitute for medical advice. Talk to a doctor about your own symptoms, tests and treatment.