What is treatment threshold?

• A. Treatment outcome probability
• B. Probability at which you start treatment
• C. Sensitivity of the test
• D. Specificity of the test

Answer: (B)

The treatment threshold is the probability of having the disease at which starting treatment becomes the preferred choice, given the balance of benefits, harms, and costs. It’s the decision point where the expected benefit of treatment outweighs the risks and downsides of treatment (and the alternative of waiting or testing further). This threshold can shift depending on how effective the treatment is, its side effects, and patient values.

For example, if a therapy has significant side effects, you’d want a higher chance of disease before treating. If a treatment is very safe, the threshold could be lower. Note that this concept is about when to treat, not about test sensitivity or specificity.