Article

Against Diagnosis

Memorial Sloan-Kettering Cancer Center, New York, New York 10021, USA.
Annals of internal medicine (Impact Factor: 17.81). 08/2008; 149(3):200-3. DOI: 10.7326/0003-4819-149-3-200808050-00010
Source: PubMed

ABSTRACT

The act of diagnosis requires that patients be placed in a binary category of either having or not having a certain disease. Accordingly, the diseases of particular concern for industrialized countries--such as type 2 diabetes, obesity, or depression--require that a somewhat arbitrary cut-point be chosen on a continuous scale of measurement (for example, a fasting glucose level >6.9 mmol/L [>125 mg/dL] for type 2 diabetes). These cut-points do not adequately reflect disease biology, may inappropriately treat patients on either side of the cut-point as 2 homogenous risk groups, fail to incorporate other risk factors, and are invariable to patient preference. This article discusses risk prediction as an alternative to diagnosis: Patient risk factors (blood pressure, age) are combined into a single statistical model (risk for a cardiovascular event within 10 years) and the results are used in shared decision making about possible treatments. The authors compare and contrast the diagnostic and risk prediction approaches and attempt to identify the types of medical problem to which each is best suited.

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