Coombs' test involves taking a blood sample which is checked for the presence of antibodies which may destroy red blood cells.
You can use the HP Print and Scan Doctor to test the status of the printer spooler, print queue, device manager, and device conflicts. 1  On the desktop, double-click the HP Print and Scan Doctor icon to open the tool. 2  Click Start on the Welcome screen. 3  Select your printer, and then click Next.  Click Fix Printing.
Load the documents into the HP printer or scanner, and then follow these steps to scan a document from the HP product using your mobile device: 1  Tap the Scan option. 2  Tap the grey text area âTouch here to selectâ to display a list of printers or scanners, and then tap to select an HP printer or scanner.