Neck Circumference
Neck circumference is a simple tape measure of the upper airway that helps screen for sleep apnoea and metabolic risk.
Plain English
Patient-Friendly Explanation
Neck circumference is the distance around the neck, measured just below the Adam's apple with a tape measure. A larger neck — roughly above 40 cm in men and 36 cm in women — suggests fat has built up around the upper airway. It is a quick, free screening clue for sleep apnoea and is also linked to higher metabolic risk.
Medical
Clinical Definition
Neck circumference is an anthropometric index of upper-body subcutaneous fat distribution that correlates with pharyngeal fat deposition and collapsibility of the upper airway. It is an independent predictor of obstructive sleep apnoea (OSA) — a neck above 40 cm in men and 36 cm in women is a validated screening criterion — and it also associates with the metabolic syndrome, insulin resistance and cardiovascular risk, in part through shared visceral adiposity. It is quick to measure, reproducible and useful when BMI alone underrepresents central fat burden.
Key Insight
Why It Matters
Your collar size can be as informative as your weight on the scale. If the neck is large and sleep is poor, we screen for sleep apnoea early — because treating it transforms energy, blood pressure and how well a weight-loss plan works.
Sources
Reviewed against standard medical references.
Medically reviewed by
Family Physician & Registered Acupuncturist, Accord Medical Clinic. MBBS (NUS), Graduate Diploma in Family Medicine (NUS), Graduate Diploma in Acupuncture (Singapore College of TCM).
Last reviewed: September 2026
This page is general health education, not medical advice. Whether any treatment is appropriate for you is a decision made in consultation after assessment.
