一、原理血清中存在的可溶性甲胎蛋白抗元与其相应抗体可引起沉淀反应、利用含盐琼脂凝胶作为基质，在一定程度内限制了抗元与抗体分子的扩散速度，能使抗元抗体复合物沉淀线，在琼脂凝胶中较长时间地保持其固定位置，可以肉眼看出，也可染色保存。 First, the principle of serum soluble alpha-fetoprotein anti-element and its corresponding antibody can cause precipitation reaction, the use of salt-based agar gel as a matrix, to a certain extent, limits the diffusion rate of anti-element and antibody molecules, anti-element antibody Complex precipitation line, in the agar gel for a long time to maintain its fixed position, can be seen with the naked eye, but also stain preservation.