From: Influence of sample collection tube method, anticoagulant-containing plasma versus serum, on influenza virus hemagglutination inhibition titer and microneutralization titer serological assays
SST Titer
Type A, H1N1
Type A, H3N2
Type B
< 40
3
1
12
40 - < 80
6
5
11
80 - < 160
7
4
160 - < 320
9
320 - < 640
0
640 - < 1280
1280