Ortho served two primary industries in the medical field: clinical laboratories, by producing platforms and assays that test for a variety of diseases, conditions, and substances; and immunohematology, by providing the means to ensure blood transfusion recipients receive appropriate and compatible blood.

1944: Philip Levine, in the field of hematology, joins Ortho Products to continue his research into the mechanics of the Rh system in human blood.

[citation needed] 2001: Ortho becomes the first diagnostic company to receive US FDA approval for automated random access hepatitis tests.

[14] 2021: Quidel announced it would acquire Ortho Clinical Diagnostics Holdings for $6 billion in cash and stock, increasing the range of COVID-19 antigen and antibody tests the business is able to offer.

[15] Ortho produces in-vitro diagnostics equipment and associated assays and reagents, serving the clinical laboratories and immunohematology sectors of the medical field.