【參考值】:嗜酸性粒細(xì)胞占白細(xì)胞總數(shù)的0.5%-3%;其絕對(duì)值為0-0.7×109/L.
血液中嗜酸性粒細(xì)胞的數(shù)目有明顯的晝夜周期性波動(dòng),清晨細(xì)胞數(shù)減少,午夜時(shí)細(xì)胞數(shù)增多。這種細(xì)胞數(shù)的周期性變化是與腎上腺皮質(zhì)釋放糖皮質(zhì)激素量的晝夜波動(dòng)有關(guān)的。當(dāng)血液中皮質(zhì)激素濃度增高時(shí),嗜酸性粒細(xì)胞數(shù)減少;而當(dāng)皮質(zhì)激素濃度降低時(shí),細(xì)胞數(shù)增加。嗜酸性粒細(xì)胞的胞質(zhì)內(nèi)含有較大的、橢圓形的嗜酸性顆粒。這類白細(xì)胞也具有吞噬功能。