# SPM

# Screening

### Exam Yield

Probability of getting 1 Question from this chapter |
159% |

This Chapter is an** absolute delight to read and solve.**

**Logic and simple Mathematics** makes this chapter an easy source of upto 8 marks.

### Question Pattern

This chapter is interesting from the Exam perspective ðŸ‘ because, most of the questions involve awareness of the different definitions, and ability to correctly identify the numerator and denominator from a given scenario.

Once you identify the above, it’s a question of knowing the correct formula and applying simple mathematics.

Quite a few question scenarios from Receiver operator characteristic curve.

### Recent Questions

Questions on this chapter from recent NEET and AIIMS examinations have been about

- Multiphasic Screening
- Test in series vs Test in parallel
- Definition – Diagnostic Powers
- Definition – Predictive accuracy
- Specificity – Signifies?
- Sensitivity numerator?
- What does a positive result for a sensitive test mean?
- How prevalence affects the different parameters?
- Definition – Validity
- Definition – Reliability
- Receiver operator characteristic curve
- Natural history & its definitions
- Prospective vs Prescriptive Screening

### Suggested Revision

The following topics should be revised without fail

- Screening test -Ideal Characteristics
- Definition – Lead time
- Repeatability of screening test
- Formula for
- Sensitivity
- Specificity
- Positive predictive value
- Negative Predictive value

- False negative vs Sensitivity
- NPV vs Sensitivity
- PPV vs Specificity