Polycythemia: Test Your Understanding
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Polycythemia means:
a
Your white blood cell count is high
.
b
Your hemoglobin or hematocrit is higher than the laboratory’s reference range
Correct — Polycythemia is diagnosed based on hemoglobin/hematocrit, not just RBC count
c
You have too many platelets
d
Your red blood cell count is high even when hemoglobin is normal
Which of the following is a common and reversible cause of polycythemia?
a
Polycythemia vera (PV)
b
Kidney tumors
c
Dehydration
Correct – Dehydration is one of the most common causes.
d
Genetic oxygen-sensing disorders
Which situation suggests relative polycythemia rather than true overproduction of red blood cells?
a
Living at high altitude
b
Sleep apnea
c
Dehydration or diuretic use
Correct – Relative polycythemia = low plasma volume, not true RBC overproduction.
d
JAK2 mutation
Which of the following is true about polycythemia vera (PV)?
a
It is the most common cause of polycythemia
b
It typically comes with other findings such as high platelets or white blood cells
c
It always causes severe symptoms
d
It requires no treatment
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