Q: At what level of WBC, Platelet and Hematocrit count, pseudohyperkalemia is expected
Answer: Pseudohyperkalemia is usually a laboratory artifact rather than a real biological abnormality.
Beside common causes of pseudohyperkalemia like hemolysis, excessive tourniquet time or a delay in the processing of the blood specimen, it can also occur in specimens from patients with abnormally high numbers of
- platelets (>500,000/mm³),
- leukocytes (> 70 000/mm³), or
- erythrocytes (hematocrit > 55%)