by Thomas Zembowicz 

How to assess probability that a tumor is melanoma given positive or negative result of an ancillary test. A companion to Dermpedia Lecture: Conditional Probability For Dermatopathologists. 

Calculator:

Sources:

Toph Tucker, Sensitivity and Specificity (sketch)

Wayne W. LaMorte, MD, PhD, MPH (Boston Universtiy School of Public Health), "The Role of Probability: Bayes Theorem"