Peripheral blood smear: Difference between revisions
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→Platelets: Specified |
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===Platelets=== | ===Platelets=== | ||
If CBC is performed, use count to determine whether platelets are "normal in number" or whether there is "thrombocytopenia" or "thrombocytosis". If no CBC, count platelets within a high power oil immersed field, which should normally be 8 to 20. | If CBC is performed, use count to determine whether platelets are "normal in number" or whether there is "thrombocytopenia" or "thrombocytosis". If no CBC, count platelets within a high power oil immersed field, which should normally be 8 to 20. | ||
[[File:Micrograph of a giant platelet.jpg|thumb|200px|A '''giant platelet'''.]] | |||
'''Large platelets''' are those with a diameter greater than 4 microns. '''Giant platelets''' are those with a diameter greater than 7 microns (larger than a normal red blood cell).<ref name=ash2016>{{cite web|url=https://imagebank.hematology.org/image/60931/giant-platelets?type=upload|title=Giant platelets|website=American Society of Hematology|author=Teresa Scordino|date=2016-12-02}}</ref> Example report: | |||
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| Numerous large and giant platelets{{Moderate-begin}}, suggesting an increased platelet turnover{{Moderate-end}}{{Comprehensive-begin}} such as in immune thrombocytopenic purpura. They may also be present in myeloproliferative neoplasms, myelodysplasia, and some congenital thrombocytopenia syndromes, including Bernard-Soulier syndrome and MYH9-related disorders.<ref name=ash2016/>{{Comprehensive-end}} | |||
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In '''thrombocytopenia''' from automatic counting, look in particular for: | In '''thrombocytopenia''' from automatic counting, look in particular for: | ||