Definition Distance between the most lateral aspects of the alae nasi.
Landmarks Measure from the lateral-most aspect of one ala nasi to the lateral-most aspect of the ala nasi (Fig. 7.72).
Instruments Spreading calipers are the most accurate instruments, although a transparent calibrated ruler or tape-measure can be substituted.
Position The patient should be reclining, with the vertical.
Remarks Values for nasal width from birth to age 16 years are shown in Fig. 7.73. There is tremendous variation both within and between ethnic groups in the interalar distance. Nasal width, like most facial widths, continues to increase with age, mainly due to soft tissue changes.
Pitfalls The nostrils should be held in the position of rest when this measurement is taken.
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