What this test measures
IPF (Immature Platelet Fraction) measures the proportion of circulating platelets that are newly released from the bone marrow — analogous to reticulocyte count for red cells. Young platelets contain residual RNA that fluoresces under specific stains used by modern haematology analysers (Sysmex XN-series, Abbott Alinity).
A high IPF in a patient with thrombocytopenia indicates the bone marrow is responding actively — usually because platelets are being destroyed peripherally (immune thrombocytopenia ITP, DIC, dengue thrombocytopenia, thrombotic microangiopathies). A low IPF in thrombocytopenia indicates the marrow is failing to produce platelets — aplastic anaemia, marrow infiltration by leukaemia or metastasis, chemotherapy-induced cytopenia, or B12/folate deficiency.
Why it matters
In the Indian context where dengue fever is endemic and causes significant thrombocytopenia, IPF helps predict recovery — a rising IPF in a dengue patient with falling platelets is a reassuring sign that the marrow is responding and platelet count will rebound, often within 2–3 days. This helps avoid unnecessary platelet transfusions which carry their own risks.
IPF is also valuable in ITP (immune thrombocytopenia): a high IPF supports the diagnosis (immune destruction with active marrow compensation) and helps differentiate it from marrow failure. In oncology, IPF is used to predict platelet recovery after chemotherapy, guiding decisions about when to give the next chemotherapy cycle or platelet transfusion.
How to prepare
No fasting required. Disclose recent chemotherapy, current medications (anticoagulants, antiplatelet agents), recent fever or infection (dengue, malaria), and any history of platelet disorders.
Markers & reference ranges
Reference ranges below are typical adult values. Your lab's reported range may differ slightly based on the assay platform and patient demographics — always read your report against the range printed on it.
| Marker | Normal range | If low | If high |
|---|---|---|---|
| IPF (%) (%)[1][2] | 1.1 – 6.1% | Low IPF with low platelet count — marrow failure or marrow suppression. Causes: aplastic anaemia, leukaemia, marrow infiltration, chemotherapy, severe B12/folate deficiency, drug-induced marrow toxicity. | High IPF with low platelet count — increased peripheral platelet destruction with marrow compensation. Causes: ITP, dengue, DIC, TTP/HUS, sepsis, hypersplenism. Recovery from chemo also shows high IPF. |
IPF interpretation in low platelet counts
| Platelet count | IPF | Likely cause |
|---|---|---|
| Low | High (>10%) | Peripheral destruction — ITP, dengue, DIC, TTP — marrow responding |
| Low | Low (<3%) | Marrow failure — aplastic anaemia, leukaemia, chemotherapy, B12 deficiency |
| Normal | Normal | Healthy steady state |
| Recovering after chemo / dengue | Rising IPF | Marrow recovery — platelet count will rebound in 2–3 days |
Frequently asked questions
What is IPF?
IPF (Immature Platelet Fraction) measures the percentage of newly made platelets in your blood — a "reticulocyte" for platelets. It tells your doctor whether your bone marrow is making platelets actively or not.
Why is IPF useful in dengue?
Dengue causes platelet destruction in addition to mild marrow suppression. A rising IPF in a dengue patient with falling platelets predicts recovery within 2–3 days — often avoiding unnecessary platelet transfusion.
Do I need to fast?
No.
My IPF is high — should I be worried?
A high IPF on its own (with normal or near-normal platelets) is not concerning. It becomes meaningful when combined with low platelets: a high IPF suggests the marrow is responding to peripheral destruction (which has a more favourable prognosis than marrow failure).
When is IPF ordered?
When platelet count is low and the cause is unclear — to distinguish destruction (high IPF, e.g. ITP, dengue) from production failure (low IPF, e.g. aplastic anaemia, marrow infiltration).
Is IPF available everywhere?
IPF requires a modern haematology analyser (Sysmex XN or equivalent). Most large NABL labs in Mumbai, Thane, and other tier-1 cities offer it. Smaller labs may not.
Will IPF replace bone marrow biopsy?
No — IPF complements but does not replace bone marrow biopsy when marrow failure is strongly suspected. It helps decide whether biopsy is needed by identifying patients with destruction-based thrombocytopenia.
How is IPF reported?
As a percentage (e.g. IPF 12.5%) and often as an absolute count (×10⁹/L). Modern reports include both alongside the regular CBC parameters.
Related Hematology / Anemia tests
Tests commonly ordered alongside IPF (IMMATURE PLATELETS FRACTION), or that help interpret an unexpected result.
Sources & references
- NCBI StatPearls — Immature Platelet Fraction · accessed 2026-05-30T00:00:00.000Z
- American Society of Hematology — Thrombocytopenia · accessed 2026-05-30T00:00:00.000Z
- British Society for Haematology — Immune Thrombocytopenia Guidelines · accessed 2026-05-30T00:00:00.000Z
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