For what diagnostic purpose is a CBC primarily ordered?

A Complete Blood Count (CBC) is primarily ordered to identify infections and hematologic conditions. This comprehensive test analyzes various components of the blood, including red blood cells, white blood cells, hemoglobin, hematocrit, and platelets.

The white blood cell (WBC) count is particularly crucial in diagnosing infections and inflammatory responses, as it reflects the body’s immune response. An elevated WBC count can indicate an ongoing infection, while a low count may suggest an underlying health issue or the effects of medications. Additionally, the CBC helps in diagnosing various hematologic conditions, such as anemia, leukemia, and other blood disorders.

In contrast, assessing liver function, evaluating heart health, and measuring blood glucose levels are specific to other tests. Liver function tests focus on enzyme levels and bilirubin to assess liver health. Evaluating heart health generally involves tests such as lipid panels, ECGs, or echocardiograms. Blood glucose levels are measured using specific tests designed to diagnose diabetes and monitor blood sugar levels. Thus, the CBC's primary role is to provide a broad overview of the blood health, with a specific emphasis on detecting infections and hematological issues.