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正常成年人的血红蛋白由于其组成的多肽链的不同,可分为三种,第一种是血红蛋白 A 又叫成年血红蛋白,由两条α链和两条β链所组成,占血红蛋白总量的67%左右;第二种是血红蛋白 A_2,山两条α涟和两条δ链所组成的占25%;第三种是血红蛋白 F 又叫胎儿血红蛋白,由两条α链和两条γ链所组成,它的含量,在胎儿和初生婴儿时期较高,可达70～80%,但在出生六个月后就降至正常成年人水平。大约在1～2%以下。在地中海β型的贫血病人,胎儿血红蛋白显著增高、可达15～90%,所以胎儿血红蛋白
Normal adult hemoglobin due to its composition of the polypeptide chain can be divided into three kinds, the first is hemoglobin A, also known as adult hemoglobin, composed of two α-chain and two β-chain, accounting for the total amount of hemoglobin 67 %; The second is hemoglobin A_2, mountain two α Lian and two δ chain consisting of 25%; the third is hemoglobin F, also known as fetal hemoglobin, composed of two α-chain and two γ-chain , Its content in the fetus and newborn baby period is higher, up to 70 to 80%, but after six months of birth dropped to normal adult levels. About 1 ~ 2% or less. In the Mediterranean beta anemia patients, fetal hemoglobin was significantly higher, up to 15 to 90%, so fetal hemoglobin