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.
My plan is to have articles on SGA (this one), AGA (a new article) and LGA (currently at alternative name macrosomia). These will then also be linked to birth weight (basically a parent article) and gestational age. Low birth weight means less than 2500g at term (ie 40 weeks) and is the same as SGA. SGA is a more official name than low birth weight and, while the common use argument may have some truth to it here, for sake of consistency I think the three articles should follow the same naming scheme.