Overview
Ascitic fluid examination is a diagnostic investigation performed to evaluate pathological accumulation of fluid in the peritoneal cavity. Ascites normally contains only a small amount of fluid, and excess accumulation indicates underlying systemic or local disease.
Ascitic fluid examination of ascitic fluid helps determine the cause of fluid accumulation and differentiate portal hypertension–related ascites from infective or malignant conditions. The serum–ascites albumin gradient is the most reliable parameter for classifying ascites and guiding further evaluation.
Symptoms
Patients with ascites commonly present with abdominal distension, discomfort, bloating, weight gain, and early satiety. Breathlessness may occur due to upward pressure on the diaphragm. Infected ascites may be associated with fever, abdominal pain, tenderness, or altered mental status. Malignant ascites can present with weight loss, anorexia, and persistent abdominal discomfort, while chronic liver disease–related ascites may coexist with jaundice, edema, and fatigue.
Causes
Ascites develops due to altered hydrostatic pressure, oncotic pressure, or increased capillary permeability. Portal hypertension from liver cirrhosis is the most common cause. Other causes include heart failure, nephrotic syndrome, and hypoproteinemia. Exudative ascites occurs due to infections such as tuberculosis or bacterial peritonitis and malignancies like ovarian, pancreatic, or gastrointestinal cancers. Pancreatitis, abdominal trauma, lymphatic obstruction, and bowel perforation are less common causes. Chemical and microscopic analysis of ascitic fluid helps identify the underlying pathology.
Risk Factors
Risk factors for ascites include chronic liver disease, alcohol abuse, viral hepatitis, congestive heart failure, chronic kidney disease, and malignancy. Immunocompromised states and poor nutritional status increase the risk of infective ascites. Patients with long-standing cirrhosis are particularly susceptible to spontaneous bacterial peritonitis. Abdominal surgeries, intra-abdominal infections, and pancreatic disease also increase the likelihood of ascitic fluid accumulation.
Prevention
Prevention of ascites focuses on early diagnosis and management of underlying diseases. Control of chronic liver disease, abstinence from alcohol, timely treatment of infections, and management of cardiac and renal disorders reduce ascites formation. Regular monitoring and early ascitic fluid analysis help detect complications such as infection or malignancy. Appropriate therapeutic interventions, including dietary modification, diuretics, and timely paracentesis, help prevent disease progression and improve patient outcomes.
