تست F/T PSA

This range is most applicable when PSA level is 4-10.
When total PSA is in the range of 4.0-10.0 ng/mL,
a free PSA /Total PSA ratio of <=0.10 indicates 49 to 65 % risk of prostate
cancer depending on age; and a free PSA / total PSA ratio of 
>0.25 indicates a 9 to 16% risk of prostate cancer depending on
age.