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Haematology and biochemistry may give evidence of dehydration, such as raised packed cell volume, total protein and urea/creatinine. A stress leukogram may also be seen. The duration of constipation may result in changes to blood electrolytes, and dehydration can lead to pre-renal azotaemia. Urinalysis should always be perfored to rule out lower urinary tract disease as a differential diagnosis and to check renal function in dehydrated animals.
 
Haematology and biochemistry may give evidence of dehydration, such as raised packed cell volume, total protein and urea/creatinine. A stress leukogram may also be seen. The duration of constipation may result in changes to blood electrolytes, and dehydration can lead to pre-renal azotaemia. Urinalysis should always be perfored to rule out lower urinary tract disease as a differential diagnosis and to check renal function in dehydrated animals.
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There are no laboratory tests specific for megacolon.
    
===Diagnostic Imaging===
 
===Diagnostic Imaging===
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