The data to encode is split in half and encoded as a split-level barcode, and this format is used if the width of the barcode is an issue. 1  The height of the top row of the GS1 DataBar Stacked barcode is 5 times the X dimension, and the height of the bottom row is 7 times the X dimension. 2  Fig.
Pitting resistance equivalent number (PREN) is a predictive measurement of the corrosion resistance of various types of stainless steel. In general: the higher PREN-value, the more corrosion resistant the steel. Steels with PREN-values above 32 are considered seawater (corrosion) resistant.
Therefore, when used in medical situations, specifically for medications, it means that the medication is to be used only when needed, rather than on a consistent basis. PRN means as needed.. It stands for pro re nata which translates to in the circumstances.. It is routinely used by physicians in prescribing instructions to mean as needed for..