The normal ankle brachial pressure index (ABPI) is 1.0.A value of 0.8 suggests

. The normal value of Ankle Brachial Pressure index (ABPI) will be less than 0.3.one should check blood pressure in all the 4 limbs.ABPI is checked in supine position;systolic blood pressure in upper and lower limbs is checked and higher value of each extremities is taken;ABPI is calculated.Results->0.9 is normal ;.70-0.89 is mild disease; 0.50-0.69 is moderate;< 0.50 is severe. Refer page no 171 of SRB's manual of surgery 5 th edition.