Re: What % of bowel adenocarcinomas secrete CEA?


<doyleb3@xxxxxxxxxxx> wrote in message
news:1137406658.878126.206210@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>I found some stats myself from
> http://www.wjgnet.com/1007-9327/11/645.asp
>
> "In the diagnosis of colorectal adenocarcinoma, CEA demonstrated a
> sensitivity of 56%, a specificity of 95%, a positive predictive value
> of 94%, a negative predictive value of 50% and an accuracy of 76.8%"
>
> I am not sure exactly what these percentages mean - can someone explain?
>

Sensirivity = probability of positive test amongst patients with disease
specificity = probabbility of negative test amongst patients without disease
positive predictive value = probability that the patient has the disease
when restricted to those patients who test positive
negative predictive value = probability that the patient will not have the
disease when restricted to all patients who test negative


.

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