Had 3 lab tests for alpha 1 antitrypsin serum level,first result was 1.35g/lit, next 1.29g/lit and last test 1.23g/lit,do i need a1at phenotype test?

Minimal risk of emph: The range for alpha 1 antitrypsin (A1AT) is < 80 mg/dL, or 0.8 g/L. You are above that threshhold, so the diagnosis can't be confirmed by this test. The heterozygous PI*MZ mutations causes levels 0.8 to 1.9 g/L but carries only minimal risk of emphysema. http://www.merckmanuals.com/professional/pulmonary-disorders/chronic-obstructive-pulmonary-disease-and-related-disorders/alpha-1-antitrypsin-def