Blood counting machines aspirate a very small amount of the specimen through narrow tubing followed by an aperture and a laser flow cell. Laser eye sensors count the number of cells passing through the aperature, and can identify them; this is flow cytometry.
In computing, Extract, Transform and Load (ETL) refers to a process in database usage and especially in data warehousing that performs: Data extraction â extracts data from homogeneous or heterogeneous data sources.
In computing, Extract, Transform and Load (ETL) refers to a process in database usage and especially in data warehousing that:1  Extracts data from homogeneous or heterogeneous data sources.s the load phase interacts with a database, the constraints defined in the database schema â as well as in triggers activated upon data load â apply (for example, uniqueness, referential integrity, mandatory fields), which also contribute to the overall data quality performance of the ETL process.