Management of Ascitic Fluid with High Mononuclear Cells

Diagnostic Criteria

A high count of mononuclear cells in ascitic fluid with a polymorphonuclear neutrophil (PMN) count <250 cells/mm³ does not require empirical antibiotic treatment and should direct evaluation towards non-bacterial causes, primarily tuberculous peritonitis or peritoneal carcinomatosis 1, 2
The diagnosis of spontaneous bacterial peritonitis (SBP) requires a PMN count ≥250 cells/mm³, regardless of cellular predominance 3, 4, 1

If PMN count is <250 cells/mm³ with lymphocytic predominance, proceed to diagnostic evaluation for non-bacterial causes 1, 2
Adenosine deaminase (ADA) levels >27 U/L in ascitic fluid have high sensitivity for tuberculous peritonitis in cirrhotic patients 2
Protein and lactate dehydrogenase (LDH) levels in ascitic fluid can help differentiate between tuberculous peritonitis and other causes 2
Serum-ascites albumin gradient (SAAG) ≤1.1 g/dL suggests tuberculous peritonitis or peritoneal carcinomatosis rather than portal hypertension alone 2

Cefotaxime 2g IV every 8 hours for 5 days is recommended as first-line treatment for SBP 4, 1, 5
Albumin IV: 1.5 g/kg at diagnosis, followed by 1.0 g/kg on day 3, reduces mortality from 29% to 10% 3, 1, 5

Empirical antibiotic treatment should be considered in patients with PMN count <250 cells/mm³ who develop signs or symptoms of infection, or have bacterascites with symptoms 4, 1
Patients with encephalopathy or spontaneous bacterial peritonitis (SBP) should receive broad-spectrum antibiotics, such as meropenem + daptomycin, due to high prevalence of multi-drug resistant organisms 5