While total PSA looks at the concentration of the protein in the bloodstream, density accounts for the fact that a larger prostate naturally produces more PSA. 0 ng/mL or higher, the immediate clinical recommendation is often a prostate biopsy, and the pathology report frequently includes a PSA density calculation.
PSA 9 Targeted Biopsy Strategy: Optimizing Detection and Clinical Decision-Making
Furthermore, the test is less reliable in men with a very small prostate, as minor fluctuations in PSA can dramatically skew the ratio. When a PSA test returns a result of 4.
The calculation is straightforward: the serum PSA value is divided by the estimated volume of the prostate, which is typically determined using transrectal ultrasound or, more commonly today, magnetic resonance imaging (MRI). This threshold is particularly useful for men with a moderately enlarged prostate, known as benign prostatic hyperplasia (BPH), where the PSA might be slightly elevated due to the size of the gland rather than cancer.
PSA 9 Targeted Biopsy Strategy: Optimizing Detection with PSA Density
To calculate this, a physician needs two data points: the PSA result from a blood test and the prostate volume from an imaging study. 0 ng/mL and an MRI estimates his prostate volume to be 40 mL, the density would be 0.
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