In some examples, a print head includes a plurality of nozzles, a test result register to store a drive bubble detect (DBD) test result for a first nozzle of the plurality of nozzles, and a result-ready register to store a status indication set to a predetermined value provided responsive to storing of the DBD test result in the test result register, where the test result register and the result-ready register are accessible by a control unit outside the print head to evaluate a nozzle condition based on the DBD test result in the test result register.