Peritonitis laboratory findings: Difference between revisions
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==Laboratory Findings== | ==Laboratory Findings== | ||
===Routine laboratory studies for peritonitis include:=== | ===Routine laboratory studies for peritonitis include:=== | ||
* | Laboratory tests, most importantly ascitic fluid analysis is required for confirmation of diagnosis of [[spontaneous bacterial peritonitis]]. | ||
*BUN, S.creatinine | * [[Complete blood count]] and [[Differential blood count (patient information)|differential count]] are tested to confirm infection. | ||
*BUN, S.creatinine to asses the renal function. | |||
*ABG analysis | *ABG analysis | ||
*S.glucose | *S.glucose | ||
*Blood culture | *Blood culture may be useful in sepsis | ||
*Serum electrolytes | *Serum electrolytes | ||
*Liver Function tests | *Liver Function tests are to be performed for the evaluation of [[cirrhosis]] | ||
*Coagulation profile | *Coagulation profile | ||
*Urine analysis | *Urine analysis and culture to rule out [[asymptomatic bacteriuria]] | ||
*Amylase and Lipase levels | *Amylase and Lipase levels to rule out pancreatitis as the cause of ascites | ||
===SBP=== | ===SBP=== | ||
*''' Early Diagnostic paracentesis''' (< 72hrs) is recommended to perform in all cirrhotic patients with ascites at the time of admission and/or in case of gastrointestinal (GI) bleeding, shock, signs of inflammation, hepatic encephalopathy, worsening of liver or renal function. Paracentesis reveals an ascitic fluid with, most commonly, a total white cell count of up to 500 cells/mcL with a high polymorphonuclear (PMN) cell count (250/mcL or more) and a protein concentration of 1 g/dL (10 g/L) or less, corresponding to decreased ascitic opsonic activity. | *''' Early Diagnostic paracentesis''' (< 72hrs) is recommended to perform in all cirrhotic patients with ascites at the time of admission and/or in case of gastrointestinal (GI) bleeding, shock, signs of inflammation, hepatic encephalopathy, worsening of liver or renal function. Paracentesis reveals an ascitic fluid with, most commonly, a total white cell count of up to 500 cells/mcL with a high polymorphonuclear (PMN) cell count (250/mcL or more) and a protein concentration of 1 g/dL (10 g/L) or less, corresponding to decreased ascitic opsonic activity. | ||
Revision as of 18:19, 12 January 2017
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Peritonitis Main Page |
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief: Shivani Chaparala M.B.B.S [2]
Overview
- Diagnosis requires paracentesis (needle drainage of the ascitic fluid). Ascites culture is negative in up to 60% of patients with clinical manifestations of spontaneous bacterial peritonitis (SBP), therefore, the diagnosis is based on the neutrophil count, which reaches its highest sensitivity with a cutoff neutrophil count of > 250/mm3.[1]
- A diagnosis of peritonitis is based primarily on clinical grounds, that is on the clinical manifestations described above; if they support a strong suspicion of peritonitis, no further investigation should delay surgery. Leukocytosis and acidosis may be present, but they are not specific findings. Plain abdominal X-rays may reveal dilated, oedematous intestines, although it is mainly useful to look for pneumoperitoneum (free air in the peritoneal cavity), which may also be visible on chest X-rays. If reasonable doubt still persists, an exploratory peritoneal lavage may be performed (e.g. in cause of trauma, in order to look for white blood cells, red blood cells, or bacteria).
Laboratory Findings
Routine laboratory studies for peritonitis include:
Laboratory tests, most importantly ascitic fluid analysis is required for confirmation of diagnosis of spontaneous bacterial peritonitis.
- Complete blood count and differential count are tested to confirm infection.
- BUN, S.creatinine to asses the renal function.
- ABG analysis
- S.glucose
- Blood culture may be useful in sepsis
- Serum electrolytes
- Liver Function tests are to be performed for the evaluation of cirrhosis
- Coagulation profile
- Urine analysis and culture to rule out asymptomatic bacteriuria
- Amylase and Lipase levels to rule out pancreatitis as the cause of ascites
SBP
- Early Diagnostic paracentesis (< 72hrs) is recommended to perform in all cirrhotic patients with ascites at the time of admission and/or in case of gastrointestinal (GI) bleeding, shock, signs of inflammation, hepatic encephalopathy, worsening of liver or renal function. Paracentesis reveals an ascitic fluid with, most commonly, a total white cell count of up to 500 cells/mcL with a high polymorphonuclear (PMN) cell count (250/mcL or more) and a protein concentration of 1 g/dL (10 g/L) or less, corresponding to decreased ascitic opsonic activity.
- Ascitic fluid analysis and culture: performed before initiating antibiotic therapy by bedside inoculation of ascites ≥ 10 mL into blood culture bottles.80-90% positive and provides the highest yield.
- Recently leukocyte esterase calibrated reagent strips (LERS) to assess the PMN cell count (cut-off of > 250 PMN/mcL) are promised to provide good screening results when the strip turns any hue of tan/brown at 3 min. High degree of sensitivity, but the sensitivity is too low for routine use.[2]
References
- ↑ European Association for the Study of the Liver (2010). "EASL clinical practice guidelines on the management of ascites, spontaneous bacterial peritonitis, and hepatorenal syndrome in cirrhosis". J Hepatol. 53 (3): 397–417. doi:10.1016/j.jhep.2010.05.004. PMID 20633946.
- ↑ Mendler MH, Agarwal A, Trimzi M, Madrigal E, Tsushima M, Joo E; et al. (2010). "A new highly sensitive point of care screen for spontaneous bacterial peritonitis using the leukocyte esterase method". J Hepatol. 53 (3): 477–83. doi:10.1016/j.jhep.2010.04.011. PMID 20646775.