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Platelet Fraction (platelet + fraction)

Distribution by Scientific Domains
Medical Sciences100%

Kinds of Platelet Fraction

  • immature platelet fraction
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    Selected Abstracts

    Aberrant increase in the immature platelet fraction in patients with myelodysplastic syndrome: a marker of karyotypic abnormalities associated with poor prognosis

    EUROPEAN JOURNAL OF HAEMATOLOGY, Issue 1 2009
    Naomi Sugimori
    Abstract Objectives:, Some patients with myelodysplastic syndrome (MDS) show a marked increase in the percentage of immature platelet fraction (IPF%) despite the absence of severe thrombocytopenia. To determine the significance of such an unbalanced increase in the IPF%, we investigated the IPF% and other laboratory findings of 51 patients recently diagnosed with MDS. Method:, Subjects consisted of 80 healthy males, 90 healthy females, and 51 patients with MDS and 20 patients with idiopathic thrombocytopenic purpura (ITP). The IPF and IPF% were determined using a Sysmex XE-2100 system loaded with IPF Master software (XE IPF Master, Sysmex). Platelet counts were measured simultaneously. Results:, IPF% and platelet counts of these patients ranged from 1.1% to 25.1% (median, 5.3%) and from 6 to 260 × 109/L (median, 71 × 109/L), respectively. Twelve patients showed platelet counts more than 50 × 109/L with 10% or more IPF%. All of the 12 patients had chromosome abnormalities including monosomy 7 and complex abnormalities involving 7 or 5q. In the other 39 patients who did not show the aberrant IPF% increase, chromosomal abnormalities were seen only in seven patients and none of them had chromosome 7 abnormalities. The IPF% of two patients increased to more than 10% in association with the appearance of monosomy 7. Conclusions:, These findings suggest that a high IPF% in MDS patient may be a marker for karyotypic abnormalities with a poor prognosis, including chromosome 7 abnormalities. [source]

    Quality counts: new parameters in blood cell counting

    INTERNATIONAL JOURNAL OF LABORATORY HEMATOLOGY, Issue 3 2009
    C. BRIGGS
    Summary Recently several parameters have been introduced to the complete blood count such as nucleated red blood cells, immature granulocytes; immature reticulocyte fraction, immature platelet fraction and red cell fragments as well as new parameters for detection of functional iron deficiency. Leucocyte positional parameters, which may diagnose specific diseases (e.g. differentiate between abnormal lymphocytes in leukaemia and viral conditions and may also detect malarial infection) are now available. At this time they are only used for research; however, generally such parameters later become reportable. One manufacturer's routine analyser allows measurement of cells by flow cytometry using monoclonal antibodies. Currently, there are no accredited external quality assessment schemes (EQAS) for these parameters. For a number of parameters, on some instruments, there is no internal quality control, which brings into question whether these parameters should be used for clinical decision making. Other more established parameters, such as mean platelet volume, red cell distribution width and the erythrocyte sedimentation rate do not have EQAS available. The UK National EQAS for General Haematology held a workshop earlier this year in 2008 to discuss these parameters. Participants were asked to provide a consensus opinion on which parameters are the most important for inclusion in future haematology EQAS. [source]

    Stability of measurement of the immature platelet fraction

    AMERICAN JOURNAL OF HEMATOLOGY, Issue 8 2010
    Mary M. Ruisi
    No abstract is available for this article. [source]

    Estimating platelet production in patients with HIV-related thrombocytopenia using the immature platelet fraction,,

    AMERICAN JOURNAL OF HEMATOLOGY, Issue 12 2009
    Brian Garibaldi
    No abstract is available for this article. [source]

    Complement activation on platelets correlates with a decrease in circulating immature platelets in patients with immune thrombocytopenic purpura

    BRITISH JOURNAL OF HAEMATOLOGY, Issue 4 2010
    Ellinor I. B. Peerschke
    Summary The role of the complement system in immune thrombocytopenic purpura (ITP) is not well defined. We examined plasma from 79 patients with ITP, 50 healthy volunteers, and 25 patients with non-immune mediated thrombocytopenia, to investigate their complement activation/fixation capacity (CAC) on immobilized heterologous platelets. Enhanced CAC was found in 46 plasma samples (59%) from patients with ITP, but no samples from patients with non-immune mediated thrombocytopenia. Plasma from healthy volunteers was used for comparison. In patients with ITP, an enhanced plasma CAC was associated with a decreased circulating absolute immature platelet fraction (A-IPF) (<15 × 109/l) (P = 0·027) and thrombocytopenia (platelet count < 100 × 109/l) (P = 0·024). The positive predictive value of an enhanced CAC for a low A-IPF was 93%, with a specificity of 77%. The specificity and positive predictive values increased to 100% when plasma CAC was defined strictly by enhanced C1q and/or C4d deposition on test platelets. Although no statistically significant correlation emerged between CAC and response to different pharmacological therapies, an enhanced response to splenectomy was noted (P < 0·063). Thus, complement fixation may contribute to the thrombocytopenia of ITP by enhancing clearance of opsonized platelets from the circulation, and/or directly damaging platelets and megakaryocytes. [source]

    Immature platelet fraction as novel laboratory parameter predicting the course of neonatal thrombocytopenia

    BRITISH JOURNAL OF HAEMATOLOGY, Issue 4 2009
    Malte Cremer
    No abstract is available for this article. [source]