In our previous piece, How UPC Bar Codes Work, we explained how a scanner reads a barcode’s black‑white pattern and translates it into numbers. UPC symbols—one of the earliest and most widespread barcode formats—appear on nearly every retail package today.
Barcodes have since become a cornerstone of countless industries. By linking a unique code to data such as product prices or employee records, businesses can retrieve information instantly, reducing manual entry errors and speeding operations. For example, shipping companies use barcodes on package labels to track each movement—recording city, transit status, and estimated arrival time—in real time.
While barcodes often seem like a convenience, their capacity to provide rapid, accurate information can be life‑saving. Below are key applications where barcodes play a critical safety role.
Hospital patients wear wristbands that carry a printed barcode in addition to their name and vital details. When clinicians need to access a patient’s chart, they simply scan the wristband with a handheld scanner. The scanner pulls up the electronic record on a connected computer, ensuring that the right medication or procedure is administered. Studies show that barcode‑enabled chart access reduces the risk of administering wrong or potentially lethal drugs (General Data Company, 2011).
The World Health Organization estimates that counterfeit drugs account for 10% of legal market sales worldwide (Kremen, 2009). To counter this, the Health Authority‑Abu Dhabi announced in 2011 a nationwide barcode system that tracks legitimate medicines and stops counterfeits from reaching consumers. Patients can verify authenticity by calling a phone number and entering the barcode from the package (Underwood, 2010). Many distributors now employ 2‑D barcodes to enforce the same safety net (Kremen, 2009).
Inside hospitals, medication bottles and IV bags are also barcode‑labelled. The goal is to match each drug precisely to the correct patient (Reinberg, 2010). However, a study of five hospitals revealed that nurses overlooked barcode alerts in over 4% of cases—equivalent to more than 10% of all prescriptions—raising the possibility of harmful dosage errors (Neale, 2008).
Many high‑security buildings employ barcode scanners on employee ID cards to control door entry. The scanner verifies the card’s code before unlocking the door, preventing unauthorized access to potentially dangerous areas and protecting personnel and the public.
Barcodes embed a Global Trade Item Number (GTIN), a unique identifier for each product or product group (GS1 US, 2011). Retailers can scan GTINs in warehouses or on store shelves to quickly locate recalled items before they reach consumers. For instance, in December 2010 Whole Foods Market recalled a milk‑free frozen dessert that may have contained milk. Using GTINs, the company identified 25 suspect pallets, traced their destinations, and alerted both stores and customers, preventing potential allergic reactions (Whole Foods, 2010).
By delivering accurate, instant information—whether for patient safety, product authenticity, or emergency response—barcodes have proven to be an indispensable tool in protecting lives.
