1 : based on an inherent sense of right and wrong natural justice. 2a : being in accordance with or determined by nature natural impulsesb : having or constituting a classification based on features existing in nature.
Assessor's parcel number. An assessor's parcel number, or APN, is a number assigned to parcels of real property by the tax assessor of a particular jurisdiction for purposes of identification and record-keeping.
APN, abbreviation for advanced practice nurse. To assist in diagnosing and monitoring congestive heart failure (CHF) and to differentiate CHF from other causes of dyspnea. Plasma (1 mL) collected in a chilled, lavender-top tube. Specimen should be transported tightly capped and in an ice slurry. (Method: Radioimmunoassay). Atrial natriuretic peptide or atrial natriuretic factor (ANF) is a hormone secreted from cells in the right atrium of the heart when right atrial pressure increases. The release of this cardiac peptide is stimulated by increases in the stretch of the atrial wall caused by an increase in blood pressure or blood volume. ANF receptors are also stimulated by elevated sodium levels.