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Calculator: Adjusted cerebrospinal fluid white blood cell count in the presence of red blood cells


Calculator: Adjusted cerebrospinal fluid white blood cell count in the presence of red blood cells

 
Input
 
Measured WBCs in CSF   #/microL
WBCs in blood  
RBCs in CSF   #/microL
RBCs in blood  

 
Result
 
Important: Inputs must be complete to perform calculation.

 
 
Adjusted WBCs in CSF   #/microL
 
Decimal precision  

 
 

 
Notes
  • This formula should be used as a correction factor for the adjusted WBC count in the CSF in the presence of CSF RBCs.
  • In the equation, the amount being subtracted is the predicted CSF WBC count that would occur if all of the CSF WBCs were the result of blood contamination.
  • WBCs: white blood cells; CSF: cerebrospinal fluid; RBCs: red blood cells.

 
Equations used
 
Adjusted_WBCs_in_CSF = Measured_WBCs_in_CSF - ((WBCs_in_blood * RBCs_in_CSF) / (RBCs_in_blood * 1000000))

 

 
References
  1. Tunkel AR. Approach to the patient with central nervous system infection. In: Principles and Practice of Infectious Diseases, 7th ed, Mandell GL, Bennett JE, Dolin R (Eds), Churchill Livingstone Elsevier, Philadelphia 2010. Vol 1, p.1183.
  2. Bonadio WA. The cerebrospinal fluid: physiologic aspects and alterations associated with bacterial meningitis. Pediatr Infect Dis J 1992; 11:423.
Only digits 0 to 9 and a single decimal point (".") are acceptable as numeric inputs. Attempted input of other characters into a numeric field may lead to an incorrect result.

Information on this page may not appear correctly if printed.

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All information contained in and produced by the EBMcalc system is provided for educational purposes only. This information should not be used for the diagnosis or treatment of any health problem or disease. THIS INFORMATION IS NOT INTENDED TO REPLACE CLINICAL JUDGMENT OR GUIDE INDIVIDUAL PATIENT CARE IN ANY MANNER. Click here for full notice and disclaimer.

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