PAG

PAG is an acronym that can refer to several different things, depending on the field. There is no single universal meaning. In technical and biological literature, PAG most commonly denotes either polyalkylene glycol oils used as lubricants in refrigerant systems or pregnancy-associated glycoproteins used as biomarkers in veterinary reproduction.

Polyalkylene glycol oils (PAG oils) are synthetic, glycol-based lubricants used primarily in air conditioning and refrigeration equipment. They provide lubrication for compressors and may be used with specific refrigerants. The choice of PAG grade and viscosity depends on the system, and compatibility with metals, seals, and the refrigerant type is an important design consideration. PAG oils can be hygroscopic and should be stored and handled to prevent moisture uptake.

Pregnancy-associated glycoproteins (PAGs) are a family of proteins produced by the placental tissue of many ruminant species. In veterinary practice, PAGs can be measured in maternal blood or milk to detect pregnancy and monitor gestational progression. PAG concentration profiles can be species-specific and are used in herd management to estimate early pregnancy status and fetal well-being.

Other uses of the acronym PAG exist in various organizations and concepts, and the intended meaning depends on context. When encountering PAG in text, the surrounding subject matter usually clarifies whether it refers to a chemical lubricant, a veterinary biomarker, or another term.