Ko’krak qafasi aylanasi - tinch holatda chuqur havo olganda, hamda chuqur havo chiqarganda o’lchanadi. Orqa tomonidan quyilgan metrli tasma tagida ko’krak suyagi burchaklari bilinib turishi old tomonidan esa ko’krak qafasining o’rta qismida bo’lishi kerak. O’lchash vaqtida qo’llar tushiriladi. Ko’krak qafasining tinch holatdagi ko’rsatgichi chuqur nafas chiqarilganidan 1-2 soatga ko’p bo’lishi kerak.
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