Pounds per square inch. The pound per square inch or, more accurately, pound-force per square inch (symbol: lbf/in2; abbreviation: psi) is a unit of pressure or of stress based on avoirdupois units. It is the pressure resulting from a force of one pound-force applied to an area of one square inch:
small for gesÂ·taÂ·tionÂ·al age. Infant whose birth weight is below the tenth percentile for gestational age. small for gestational age. SGA. 1. Term describing an infant whose birth weight is at or below the 10th percentile, as correlated with the number of weeks in utero on the intrauterine growth chart.
The pathogenesis, epidemiology, risk factors, complications, and management of infants born LGA will be reviewed here. DEFINITION. In general, LGA is defined as a birth weight (BW) greater than the 90 th percentile for age. However, it has been suggested that the definition be restricted to infants with BW greater than the 97 th percentile (2 standard deviations above the mean), as this more accurately describes infants who are at greatest risk for perinatal morbidity and mortality .