preferred_name: transrectal sonogram of prostate: specific antigen (PSA) density (___ ng/mL)
preferred_name_lc: transrectal sonogram of prostate: specific antigen (psa) density (___ ng/ml)
label: transrectal sonogram of prostate: specific antigen (PSA) density (___ ng/mL)
label_lc: transrectal sonogram of prostate: specific antigen (psa) density (___ ng/ml)