* Relation FEV1 To FEV3 Can Be Low

* Relation FEV1 to FEV3 can be low because of initially reduced . * FEV1-to-FVC and FEV3 - to-FVC can be normal or even increased. * FEF (25-75 %) often lower than due. Investigating the relation of the measured indicator to Due in lungs, it is possible to estimate gravity process in Lungs. VC (Vital capacity of a lung) Interpretation > = 81 % from the due Norm 66 - 80 % from due Minimum 51 - 65 % from due Average <= 50 % from the due Expressed TLC (the General capacity of a lung) > = 81 % from the due Norm 66 - 80 % from due Minimum 51 - 65 % from due Average <= 50 % from the due Expressed Where: the forced vital capacity of lungs (FVC) as consider some, is equivalent to vital capacity Lungs (VC). Murray J, Nadel J. Textbook of Respiratory Medicine, 2nd edition. W. B. Saunders Company. 1994. 871 pg One of variants of the short scheme of the differential diagnosis at a syndrome to superfluous lightness (emphysema) of lungs. The DIAGNOSIS: Possible signs EMPHYSEMAS *- usually the middle of a life, * progress slowly, * disease and smoking history.