At present the analysis skills are improved. The ultrasensitive <span class="UNKNOWN_WORD">PSA</span> detects minimal changes and it is theoretically better that the standard <span class="UNKNOWN_WORD">PSA</span>. The standard <span class="UNKNOWN_WORD">PSA</span> is the still useful and the important thing it is not to confuse the units of measurement of one and another <span class="UNKNOWN_WORD">PSA</span> since they are not comparable. To consult with the laboratory the values of reference. There exist a few stage of extrapolation of a few and other types of <span class="UNKNOWN_WORD">PSA</span>.
