Your urologist may measure your ‘PSA density’. This measures your PSA level in relation to the size of your prostate gland. Men with larger prostate glands have higher PSA levels. You will usually need to have a PSA density of less than 0.15 ng/ml/ml to have active surveillance. 5 You can work out your PSA density by dividing your PSA level by the volume of your prostate gland.
Prostate volume = 50ml
PSA level = 7 ng/ml
PSA density = 7 divided by 50 = 0.14.
In this example, the PSA density is less than 0.15, which means that active surveillance may be a suitable option. Your urologist can tell you the volume of your prostate gland and can help to explain more about PSA density.