The Case | Best not shaken or stirred! Chronic lymphocytic leukemia and hyperkalemia.

@article{Smalley2010TheC,
  title={The Case | Best not shaken or stirred! Chronic lymphocytic leukemia and hyperkalemia.},
  author={Rebecca M Smalley and Shelly Cook and Micah R. Chan},
  journal={Kidney international},
  year={2010},
  volume={77 2},
  pages={
          167-8
        }
}
A 79 year old male with chronic lymphocytic leukemia (CLL) presented to the emergency department with sepsis. Five days prior to presentation he was treated with cyclophosphamide, vincristine, rituximab and prednisone for progressive CLL, as noted on a bone marrow biopsy performed the previous week. (Figure 1) He was admitted to the intensive care unit (ICU) and empirically treated with cefepime, ciprofloxacin and vancomycin. Blood cultures revealed E. coli sensitive to cefepime, and the… 
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Pneumatic tube transport systems should be listed in the scientific literature as another potential cause of pseudohyperkalemia, especially in patients with high WBC and/or platelet counts, because regular treatments for hyperKalemia for this problem may cause patient harm.
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References

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Pseudohyperkalemia in extreme leukocytosis.
TLDR
A case of pseudohyperkalemia is observed in a patient with chronic lymphocytic leukemia which was unrelated to both of these mechanisms, and was instead related to a common mode of drawing blood, i.e. with vacuum tubes.
Pseudohyperkalemia due to pneumatic tube transport in a leukemic patient.
TLDR
This is the first description of pneumatic tube transport causing pseudohyperkalemia, and clinicians should be aware of this potential cause of false elevation of plasma potassium levels.
Pseudohyperkalemia--is serum or whole blood a better specimen type than plasma?