The activities of adendsirie deaminake (ADA)

serum angiotension converting enzyme (ACE;) lysozyme (LYZ)

laetie dehydrogenatee(LDB) in seran aad pleural were me astrred in 51 cases with tuber pl effusions and 42 cases; with maligant pteurai ef fusion. The results showed that the activihies of PAD A

PACE

PLYZ in tubenculous pleu raj the effsion were significatly higher than that of malignaat plufal effusion(P<t).OB-0.-01). The activity of PLDH in malignanb pleural effufusion; was higher than tubberculous pleural effusion bulnot significant . (P>0.5). The menoenzymatic seasitiyity of. PADA

PACE-.PLYZ. in diagnosis of tuberculous

pleur effusion

was 88%

74%

73.3% respectively. The polyen-zymatic sensitivity of two or three combination for differential diagnosis between tuberculous and malignant pleural effusion was 95% in PADA+PACE

100% in P’ADA+PACE + PLYZ.’ If the ratio of ehzyAatic activity in pleitral fluid to" serum among all’groups was calculated

the sensitivity of PAD:A+PLYZ ratio for different ntial dikgflosis of-these two kinds of pleural effusion was raised from 81% to 4.11%.