The document presents multiple analyses of pleural fluid, indicating variations in appearance, protein levels, and cell types. Key findings include differences in serum protein and LDH ratios alongside consistent results for gram and zinc stains showing no organisms. The analyses suggest potential diagnostic information based on the characteristics of the pleural fluids sampled.

1. Pleural fluid analysis
• Appearance – Amber coloured
• Pleural fluid: Serum protein - >0.5
• Pleural fluid: Serum LDH - >0.6
• Cell type – P20 L80
• Gram stain – No organism
• ZN stain – No organism
• Others – glucose <1.4 mmol/L

2. Pleural fluid analysis
• Appearance – serous
• Pleural fluid: Serum protein - <0.5
• Pleural fluid: Serum LDH – <0.6
• Cell type – few serosal cells
• Gram stain – No organism
• ZN stain – No organism

3. Pleural fluid analysis
• Appearance – serous or blood stained
• Pleural fluid: Serum protein - >0.5
• Pleural fluid: Serum LDH – >0.6
• Cell type – No predominant cell
• Gram stain – No organism
• ZN stain – No organism
• Others – High amylase

4. Pleural fluid analysis
• Appearance – Amber coloured
• Pleural fluid: Serum protein - >0.5
• Pleural fluid: Serum LDH - >0.6
• Cell type – P70 L30
• Gram stain – No organism
• ZN stain – No organism