Hi David, - There really is no such thing as a detectable PSA of “0” in PSA readings, although the term “zero” is often carelessly used when reporting such results.
PSA results are ALWAYS limited by the reliability threshold of the assay (test) material used to measure its presence in the bloodstream. Such threshold limitations vary, due to the KNOWN sensitivity level of the manufacturer’s specific assay material used. So, TECHNICALLY, there cannot be such thing as a biological “0” result.
Depending on the tests known sensitivity level, results that are below reliable ng/ml level (0.1, 0.01 or 0.001 as examples) are clearly identified by placing a “LESS THAN” icon designation (<), immediately preceding the stated numerical result. EXAMPLE: <0.1 ng/ml means that any reading obtained was either below the tests reliability level. Therefore, when the term “zero” is used, it normally refers to the “clinical” definition of the term, which is USUALLY any finding below 0.1 ng/ml on the Standard PSA test,.
Unfortunately, in some verbal communications the “LESS THAN’ designation (<) is sometimes missed or ignored by the communicator, which erroneously distorts its meaning and significance. Incidentally, you mistakenly used the (>) icon in your Post, which is the designation for "greater than" rather than "less than"
This is why I always recommend that patients obtain a printed copy of such laboratory results, for their records. I hope this helps! -
[email protected] (aka) az4peaks