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Why do physicians use blood analysis to help detect disease?
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blood analysis
The physical and chemical properties of a sample of blood are examined during blood analysis. The examination of blood is important for the accurate diagnosis of disease.
Physicians use blood analysis to detect disease because blood circulates throughout the body, carrying essential nutrients and waste products that serve as indicators of overall health and specific physiological states. By measuring various constituents, clinicians can identify abnormalities that signal the presence of both blood-related disorders and systemic diseases.12
Diagnostic blood examinations generally fall into two categories:
- Cellular Analysis: Tests like the complete blood count quantify red blood cells, white blood cells, and platelets. Changes in the number, size, or appearance of these cells can indicate conditions such as anemia, infection, or cancer.132
- Biochemical and Plasma Analysis: Measuring substances in the plasma or serum—such as glucose, urea, enzymes, and hormones—helps diagnose non-blood diseases, including diabetes, kidney dysfunction, liver disorders, and heart disease.142
Furthermore, biomarkers found in the blood allow for the early detection of disease, monitoring of treatment efficacy, and assessment of health risks, making blood analysis an indispensable tool in modern medicine.45