A tuberculin skin test should be read within 24 hrs ___ administration.

Rationale

A tuberculin skin test should be read within 24 hrs of administration.

The phrase "within 24 hrs of" accurately conveys the time frame required for interpreting the results of a tuberculin skin test, emphasizing a clear and specific relationship between the test's administration and its evaluation.

A (of) CORRECT

This choice correctly indicates the relationship between the time limit and the action of administering the test. "Of" is used to denote the period after the administration, making it the most appropriate preposition to complete the sentence.

B (since) YOUR ANSWER

Using "since" would imply a causal relationship or time from a past event, which does not fit in the context of reading the test result. It suggests that the reading is dependent on an event occurring or having occurred, rather than establishing a specific timeframe following the test administration.

C (as) YOUR ANSWER

The preposition "as" indicates a simultaneous action or condition, which is not suitable in this context. It does not effectively communicate the necessary timeframe for reading the test results after they have been administered.

D (from) YOUR ANSWER

Although "from" could suggest a starting point in time, it lacks the specificity of "of" in terms of indicating a time duration. It does not clearly convey that the reading should occur within a defined time period after the test is given.

Conclusion

The phrase "within 24 hrs of" is essential for conveying the time requirement for reading a tuberculin skin test after its administration. The other options fail to articulate the necessary relationship between the test's administration and the subsequent reading, which is crucial for accurate assessment and diagnosis.

A tuberculin skin test should be read within 24 hrs ___ administration.

A tuberculin skin test should be read within 24 hrs of administration.

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