A male patient has a probable diagnosis of polycythemia vera. The nurse reviews the patient's lab work for which of the following diagnostic indicator?
a) Leukocyte count of 11,500/mm3
b) Erythrocyte count of 6.5 m/?L
c) Platelet value of 350,000/mm3
d) Hematocrit of 60%
Answer: Hematocrit of 60%