What is the upper limit for MPV measurement?

• A. Less than 10 mm
• B. Less than 12 mm
• C. Less than 15 mm
• D. Less than 13 mm

Answer: (D)

MPV shows the average size of platelets, a volume parameter. The upper limit of normal MPV is typically around 12–13 femtoliters, and many references use 13 fL as the cutoff. So, the option stating that MPV should be less than 13 (even though the prompt lists the unit as mm, which is a mismatch for volume) best reflects this commonly used upper bound. In practice, always compare to your lab’s reference range, since analyzer differences can shift the exact cutoff. Higher MPV can indicate increased platelet production or platelet activation, while lower values can reflect small platelets or measurement variation.