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Mean Platelet Volume (MPV)

The average size of your platelets, the small blood cells that help your blood clot.

AI-verified against cited sources. Awaiting expert reviewAlso called MPV, VPMLOINC 32623-1

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What it is

Mean platelet volume (MPV) is the average size of your platelets, measured in femtoliters (fL). Platelets are tiny cell fragments that help your blood clot. Newer platelets tend to be larger, so MPV gives a rough sense of how quickly your bone marrow is making them. The blood-count machine measures it as part of a routine complete blood count (CBC).

Why it matters

MPV adds context when your platelet count is low or high. A low count with larger platelets points to a different set of causes than a low count with smaller platelets. On its own, MPV is rarely used to make decisions. Researchers have linked it to many conditions, but no firm cutoffs exist. Ranges also differ between instruments, so a change over time at the same lab tells you more than a single number.

If it’s low

A low MPV means your platelets are smaller than average on your lab's instrument. Smaller platelets tend to be older, so MPV can be low when the bone marrow is making fewer platelets. Often it reflects normal variation or the instrument used.

Common causes

  • Normal variation, or differences between lab instruments
  • Sample type or timing, since platelets measure smaller in citrate tubes and when tested soon after the draw
  • Lower platelet production, as in bone marrow failure conditions such as aplastic anemia
  • Flares of some inflammatory conditions, such as ulcerative colitis or lupus, in some studies

What can help

  • Ask your clinician how your MPV fits with your platelet count and other blood counts
  • If you track MPV over time, use the same lab each time

If it’s high

A high MPV means your platelets are larger than average on your lab's instrument. Larger platelets tend to be younger, so MPV can rise when the body is replacing platelets quickly. Often it reflects normal variation or how the sample was handled. A clinician can read it together with your platelet count.

Common causes

  • Normal variation, or differences between lab instruments
  • A sample that sat for a couple of hours before testing, because platelets swell in the EDTA tube
  • Conditions where platelets are cleared faster than usual and the marrow replaces them, such as immune thrombocytopenia
  • Smoking, diabetes, heart and blood vessel disease, and long-term inflammatory conditions, which have been linked to higher MPV in studies (MPV alone cannot tell whether you have any of them)
  • Rare inherited conditions that cause large platelets, such as MYH9-related disease and Bernard-Soulier syndrome

What can help

  • Ask your clinician how your MPV fits with your platelet count
  • Ask whether the sample could have affected the result and whether a repeat test makes sense
  • If you track MPV over time, use the same lab each time

Usual ranges

What labs print as the reference range, by who was tested. Ranges differ a little between labs, so the range on your own report is the one your result is judged against.

For adults: 7.2–12.3 fL. Source: Oregon Health & Science University Lab Services, ARUP Laboratories, Parkview Health Laboratory, MHCC Laboratory, Mediators of Inflammation, Scandinavian Journal of Clinical and Laboratory Investigation, Hematology, Transfusion and Cell Therapy, Laboratory Hematology.

See MPV by age and sex, with the U.S. survey numbers where they exist.

How common is your level?

NHANES describes the US civilian, non-institutionalized population, not a 'healthy' reference group. People with disease, on medication, fasting or not (except fasting-subsample markers), smokers and so on are all included. A percentile says where a value sits among Americans of that sex and age, not whether it is normal.

How MPV varies with age in the U.S.Shaded: middle 90% and middle 50% of people. Line: the median. fL. Point at any age, or focus the chart and use the arrow keys, to read both sexes in words.

Use the left and right arrow keys to read each age. Shift moves five years.

Reference data derived from CDC/NCHS National Health and Nutrition Examination Survey (NHANES), cycles 2015-2016, 2017-March 2020 (pre-pandemic), August 2021-August 2023. Analysis by bloodtesttracker.com; not endorsed by CDC, NCHS or HHS.

Explore MPV by age and sex: every percentile as a table, with a download.

What can affect your result

  • Instrument and method: analyzers that use electrical impedance and those that use laser light give different results
  • Time from draw to test: platelets swell in an EDTA tube for about two hours after the draw
  • Tube type: blood in citrate gives smaller platelets than blood in EDTA
  • Sample temperature: chilled samples can read higher
  • Platelet count: MPV tends to run higher when the count is lower
  • Smoking, diabetes and inflammation have been linked to higher MPV
  • Age and sex: small differences at most. One Danish study found none, and a UK study found a slight difference between men and women
  • Platelets swell in the EDTA tube for about two hours after the draw, so a sample that waits longer reads higher.
  • Blood collected in a citrate tube gives smaller platelets than blood in an EDTA tube.
  • Chilled samples can read higher. Warming a sample back to body temperature reverses this.
  • Analyzers that use electrical impedance and those that use laser light give different results, so ranges do not carry over between labs.
  • On some analyzers, small red cell fragments or cell debris can be counted as platelets and pull MPV down.

Days to a couple of weeks. Platelets circulate for about 8 to 12 days, and MPV follows how fast the bone marrow is making new ones.

When to talk to a clinician

MPV on its own is seldom a reason for urgent care. Contact a clinician soon if you notice unusual bruising, bleeding gums, frequent nosebleeds or tiny red or purple dots on your skin, especially if your platelet count was flagged low. Call 911 or your local emergency number for heavy bleeding that will not stop, a sudden severe headache or confusion.

Questions you could ask

  • Does my MPV matter in light of my other results?
  • Has my MPV changed compared with my past results at this lab?
  • How does my MPV fit with my platelet count?
  • Could the way the sample was handled explain this result?
  • How does my MPV fit with my platelet count and other blood counts?
  • Should we recheck it at the same lab?

Questions people ask

Why does the MPV range on my report differ from another lab's?

MPV depends on the instrument and method, so labs set their own ranges. Adult ranges printed by US labs run from about 7 to 12.6 fL. A Danish population study on one Sysmex analyzer found 9.6–13.1 fL. Use the range printed on your own report.

Can MPV tell me my risk of a heart attack or a clot?

Studies link higher MPV with heart and blood vessel disease in groups of people. There is no agreed cutoff, and MPV cannot predict one person's risk. Clinicians do not use it alone to make these decisions.

Why did my MPV change between tests?

A different lab, instrument or tube type can change MPV. So can the time between the blood draw and the test. A small change that comes with a steady platelet count is often explained by these factors. Ask your clinician if you are unsure.

Is MPV the same as my platelet count?

No. Your platelet count is how many platelets you have. MPV is their average size.

Show the science and sources

Units

  • 1 fL = 1 fL
  • 1 fL = 1 µm³

Is a change real?

MPV naturally varies about 2.02% from test to test in the same healthy person. Between two results from the same lab, a change of roughly 6% or more is unlikely to be day-to-day noise or lab variation (95% reference change value). Source: Systematic review and meta-analysis of within-subject and between-subject biological variation estimates of 20 haematological parameters (Coskun A et al., EFLM WG-BV).

For clinicians and researchers

MPV is the mean of the platelet volume distribution, reported in fL. Analyzers estimate it by electrical impedance or by optical (laser scatter) methods, and results differ by method and manufacturer. There is no universal calibrator, so each laboratory should establish its own interval. Platelets swell in K2-EDTA for roughly the first 120 minutes (about 60 minutes in citrate), and citrate samples read smaller than EDTA samples (about 7.0 vs 8.0 fL in one study). Cooling a sample raises MPV and rewarming to 37 °C reverses it. On impedance counters, small red cell fragments or debris can be counted as platelets. MPV is inversely related to platelet count in many datasets, though not in all. Larger platelets are generally younger and more reactive, so MPV tracks marrow output. All platelet indices were higher in immune thrombocytopenia than in aplastic anemia, where production is low (Kaito 2005). Inherited macrothrombocytopenias such as MYH9-related disease and Bernard-Soulier syndrome have larger platelets than ITP, and an MPV above 12.4 fL separated the groups in one study of samples tested within 2 hours (Noris 2009). Higher MPV has been reported in cardiovascular disease, stroke, diabetes, chronic kidney failure, intestinal and rheumatoid disease and some cancers, and lower MPV during flares of some inflammatory diseases. Effect sizes vary, cutoffs are not standardized, and MPV is not a diagnostic test for any of these (Korniluk 2019). Population studies on Sysmex analyzers give higher intervals than most US labs (9.6–13.1 fL on an XE-5000; 9.1–13.0 fL in men and 9.2–12.8 fL in women on an XN-10), which shows why intervals must be set per instrument.

LOINC 32623-1 (primary), 28542-9. Specimen: whole-blood.

Sources

  1. CBC with Differential: reference ranges (OHSU Lab Services test directory), Oregon Health & Science University Lab Services
  2. CBC with Platelet Count and Automated Differential (ARUP test 0040003), reference intervals effective March 1, 2021, ARUP Laboratories (2021)
  3. Complete Blood Count with Differential (Parkview Laboratory test directory), Parkview Health Laboratory
  4. Complete Blood Count (CBC) with Automated Differential (MHCC Laboratory test catalog), MHCC Laboratory
  5. Mean Platelet Volume (MPV): New Perspectives for an Old Marker in the Course and Prognosis of Inflammatory Conditions, Mediators of Inflammation (2019)
  6. Reference intervals for mean platelet volume and immature platelet fraction determined on a Sysmex XE-5000 hematology analyzer, Scandinavian Journal of Clinical and Laboratory Investigation (2016)
  7. Sex-divided reference intervals for mean platelet volume, platelet large cell ratio and plateletcrit using the Sysmex XN-10 automated haematology analyzer in a UK population, Hematology, Transfusion and Cell Therapy (2019)
  8. Do we need time adjusted mean platelet volume measurements?, Laboratory Hematology (2010)
  9. Platelet size deviation width, platelet large cell ratio, and mean platelet volume have sufficient sensitivity and specificity in the diagnosis of immune thrombocytopenia, British Journal of Haematology (2005)
  10. Platelet size distinguishes between inherited macrothrombocytopenias and immune thrombocytopenia, Journal of Thrombosis and Haemostasis (2009)

AI-verified against cited sources. Awaiting expert review. Last reviewed 2026-10-03. How we build and check these pages.

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