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Neck circumference reflects upper-body fat and is a recognised screening marker for obstructive sleep apnoea as well as metabolic risk. The usual thresholds are 40 cm for men and 35 cm for women, and clinical scoring adds about 4 cm when BMI exceeds 30. A 41 cm neck sits above the male threshold.
Thresholds
40 cm for men, 35 cm for women
Adjusted neck circumference
add about 4 cm when BMI is 30 or above
These figures are population-average estimates, not a medical assessment or diagnosis. Body composition equations carry errors of several percentage points, and healthy ranges vary with age, ethnicity, muscularity and medical history. Discuss weight or body composition goals with a qualified clinician or dietitian.
Because fat deposited around the pharynx narrows the airway, making collapse during sleep more likely.
Muscular necks raise the measurement without the airway narrowing, so the marker is less useful for trained athletes.