PARAMETERS YIELD (N) PERCENTAGE
PLEURAL FLUID AFB SMEAR 03 03%
SPUTUM FOR AFB 09 09%
PLEURAL FLUID CULTURE 28 28%
PCR 74 74%
PLEURAL FLUID ADA >40 UNITS/LITER 85 85%
PLEURAL FLUID LYMPHOCYTES >50% 87 87%
LN RATIO 0.75 91 91%
PLEURAL FLUID CULTURE+PCR+ ADA+PLEURAL FLUID LYMPHOCYTE >50% +LN RATIO>0.75 98 98%
PLEURAL FLUID CULTURE+PCR+ ADA+LN RATIO+PLEURAL BIOPSY 100 100%
Table 4: Yield of various diagnostic procedures
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