Most of the automated blood analysers used today, automatically generate the results in electronic format, and many of them are interfaced to the computer.
When samples are processed in multiple analysers and equipments, the results are verified and validated as part of the internal quality control process. After verification they are consolidated and the results are fed into the Lab Information system (LIS). From here the reports gets printed and usually get signed off by the Senior pathologist, who performs one more round of scrutiny before sign off. Sometimes if the figures look too abnormal, which pre-empts some serious investigation, the lab would call the referring doctor directly and discuss the issue. For some tests, results are available within hours, for some by the end of the day. Some tests could take 48-72 hours to get the results. Some tests could take much longer. It depends upon the complexity of the test, processing frequency in the lab and other factors.