A blood test for an infection gives a clear result for a man who in fact has the infection. What type of error is this, and what is its main danger?
- The test said “no infection”, so the result is negative.
- He does have the infection, so the result is false.
- A person who is told he is healthy will not be given treatment.
Answer: A false negative; the infection is left untreated and may get worse or spread.