What was the difference between the estimated versus actual forced vital capacity? when might it be useful to use the estimated numbers instead of measurements?

Actual forced vital capacity exact measurement derived from Spirometry while estimating forced vital capacity. Estimated forced vital capacity is done to predict the forced vital capacity before the test is done.

Explanation: Estimated numbers are used when a patient has done measurement within a year.

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answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]