The key information is the < sign. It means that they can't measure anything below that. In chemical analysis, there is no such thing as a "0" result. There is a known value that CAN be measured (in this case 0.05), and there are readings that are "present but smaller than we can say for sure", so they report as a <.
This whole thing of ever changing low limits creates way more anxiety than it should...and no one ever explains them to the patient.
Age at Diagnosis: 56
RALP on 2/17/15, BJC St. Louis, Dr. Figenshau
58.5g, G3+4, 20%, 4 quadrants involved
PSA Non-Detect since April, 2015
My Story: www.healingwell.com/community/default.aspx?f=35&m=3300024