PSA 50 Percent or Greater than Nadir

**Semantic type:** Laboratory or Test Result

**Definition:** A finding indicating that the blood concentration of prostate specific antigen in a subject's sample has increased by 50 percent or more over the lowest value recorded for a sample from that subject.

**Synonyms:** - PSA 50% or Greater than Nadir - PSA Fifty Percent or Greater than Nadir - PSA Greater than or Equal to 50 Percent Above Nadir