Prid = Presence or identity: Prid stands for “Presence or identity”, is used for assays that detect whether or not an analyte of a particular kind is present, and if it is, to identify the specific analyte.
time
Pt = Point in time: To identify measures at a point in time. This is a synonym for “spot” or “random” as applied to urine measurements.
system
Amnio fld = Amniotic fluid
scale
Nar = Narrative: Text narrative, such as the description of a microscopic part of a surgical papule test.