Escherichia coli enteritis laboratory findings: Difference between revisions
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==Overview== | ==Overview== | ||
Diagnostic laboratory findings for ''E. coli enteritis'' usually include either [[stool culture]], [[ELISA]], or [[polymerase chain reaction]] (PCR). Other laboratory findings in ''E. coli'' enteritis are usually non-specific and may include increased [[white blood cell]] count and elevated | Diagnostic laboratory findings for ''E. coli enteritis'' usually include either [[stool culture]], [[ELISA]], or [[polymerase chain reaction]] (PCR). Other laboratory findings in ''E. coli'' enteritis are usually non-specific and may include increased [[white blood cell]] count and elevated inflammatory markers. Laboratory findings suggestive of [[dehydration]] may include relative [[polycythemia]], [[metabolic alkalosis]], elevated [[BUN]] and serum [[creatinine]] (suggestive of pre-renal acute kidney injury). When hospitalized, patients should also be monitored for laboratory findings that may suggest development of [[hemolytic uremic syndrome]], such as [[hemolytic anemia]], elevated serum [[creatinine]], and [[thrombocytopenia]]. | ||
==Laboratory Findings== | ==Laboratory Findings== | ||
===Non-Diagnostic Laboratory Findings=== | ===Diagnostic Laboratory Findings=== | ||
*'''Stool cultures''' | |||
:Usually considered a reliable diagnostic test with good sensitivity since ''E. coli'' organisms typically shed continuously | |||
:*Diagnosis of ''E. coli'' O157:H7 usually requires sorbitol-MacConkey agar | |||
*'''Serotyping''' | |||
:*ELISA detects Shiga-like toxins 1 and 2 in stools | |||
:*ELISA may detect anti-LPS IgM antibodies against some ''E. coli'' strains | |||
*'''Polymerase chain reaction (PCR)''' | |||
:*Detection of E. coli pathogens and Shiga-like toxin===Non-Diagnostic Laboratory Findings=== | |||
*Lab findings of ''E. coli enteritis'' are usually related to the degree of dehydration. Lab findings include: | *Lab findings of ''E. coli enteritis'' are usually related to the degree of dehydration. Lab findings include: | ||
:*[[WBC]] count may be normal or elevated | :*[[WBC]] count may be normal or elevated | ||
| Line 14: | Line 22: | ||
:*Elevated creatinine is suggestive of pre-renal [[acute kidney injury]] in severe dehydration or onset of hemolytic uremic syndrome | :*Elevated creatinine is suggestive of pre-renal [[acute kidney injury]] in severe dehydration or onset of hemolytic uremic syndrome | ||
*To learn more about laboratory findings associated with hemolytic uremic syndrome (such as prolonged PT and PTT, hemolytic anemia, and thrombocytopenia) click [[Hemolytic-uremic syndrome laboratory findings|'''here''']]. | *To learn more about laboratory findings associated with hemolytic uremic syndrome (such as prolonged PT and PTT, hemolytic anemia, and thrombocytopenia) click [[Hemolytic-uremic syndrome laboratory findings|'''here''']]. | ||
==References== | ==References== | ||
{{Reflist|2}} | {{Reflist|2}} | ||
Revision as of 20:44, 9 December 2015
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Escherichia coli enteritis Microchapters |
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Differentiating Escherichia coli enteritis from other Diseases |
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Diagnosis |
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Treatment |
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Escherichia coli enteritis laboratory findings On the Web |
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American Roentgen Ray Society Images of Escherichia coli enteritis laboratory findings |
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Risk calculators and risk factors for Escherichia coli enteritis laboratory findings |
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
Overview
Diagnostic laboratory findings for E. coli enteritis usually include either stool culture, ELISA, or polymerase chain reaction (PCR). Other laboratory findings in E. coli enteritis are usually non-specific and may include increased white blood cell count and elevated inflammatory markers. Laboratory findings suggestive of dehydration may include relative polycythemia, metabolic alkalosis, elevated BUN and serum creatinine (suggestive of pre-renal acute kidney injury). When hospitalized, patients should also be monitored for laboratory findings that may suggest development of hemolytic uremic syndrome, such as hemolytic anemia, elevated serum creatinine, and thrombocytopenia.
Laboratory Findings
Diagnostic Laboratory Findings
- Stool cultures
- Usually considered a reliable diagnostic test with good sensitivity since E. coli organisms typically shed continuously
- Diagnosis of E. coli O157:H7 usually requires sorbitol-MacConkey agar
- Serotyping
- ELISA detects Shiga-like toxins 1 and 2 in stools
- ELISA may detect anti-LPS IgM antibodies against some E. coli strains
- Polymerase chain reaction (PCR)
- Detection of E. coli pathogens and Shiga-like toxin===Non-Diagnostic Laboratory Findings===
- Lab findings of E. coli enteritis are usually related to the degree of dehydration. Lab findings include:
- WBC count may be normal or elevated
- Elevated concentration of inflammatory markers (e.g. CRP or ESR)
- Chloride-sensitive metabolic alkalosis and electrolyte derangement (commonly hypokalemia)
- Relative polycythemia in cases of dehydration or hemolytic anemia in cases of hemolytic uremic syndrome
- Elevated concentration of BUN
- Elevated creatinine is suggestive of pre-renal acute kidney injury in severe dehydration or onset of hemolytic uremic syndrome
- To learn more about laboratory findings associated with hemolytic uremic syndrome (such as prolonged PT and PTT, hemolytic anemia, and thrombocytopenia) click here.