NBRC Normal Values TMC Practice Test

Which statement about the normal TLC percent predicted range is true?

80-120% 60-90% 100-140% 120-160%

Correct Answer:

80-120%

Explanation:

TLC percent predicted compares your measured total lung capacity to a normal value expected for someone of the same age, height, and sex. The range considered normal is 80-120% of that predicted value. Staying within this band means the lungs can hold a typical amount of air for the person’s body size. If TLC falls below 80% of predicted, it suggests a restrictive issue where the lungs or chest wall can’t hold as much air. If TLC rises above 120% of predicted, it indicates hyperinflation or air trapping, which is common with obstructive conditions like emphysema or chronic asthma. So, the statement that 80-120% of predicted is the normal TLC range aligns with standard reference values.

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