FGF21 是一種主要在肝臟中產生的代謝激素。它通過多種組織中的多效作用調節葡萄糖和脂質代謝，並在各種壓力下防止代謝損傷。
 在人類中，高循環 FGF21 水平存在於肥胖和多種心臟代謝疾病中， 包括代謝綜合徵、2型糖尿病、非酒精性脂肪肝和冠狀動脈疾病。血清 FGF21 是這些疾病早期檢測和風險預測的潛在生物標誌物。

該測定是定量夾心ELISA。免疫板預塗有小鼠 FGF-21 特異性兔多克隆抗體。標準品和样品被吸入孔中，任何存在的小鼠 FGF-21 都被固定的抗體結合。洗去任何未結合的物質後，將生物素標記的小鼠 FGF-21 特異性多克隆抗體加入孔中。在去除任何未結合試劑的洗滌步驟後，加入鏈黴親和素-HRP 偶聯物 (STP-HRP)。在最後一個洗滌步驟後，加入 HRP 底物溶液，顏色與最初結合的小鼠 FGF-21 的量成比例。停止測定並使用酶標儀測定孔的光密度。由於吸光度的增加與捕獲的小鼠 FGF-21 的量成正比，因此可以從每個測定中包含的參考曲線中插入未知樣品濃度。

一種。 標準曲線的典型代表

以下標準曲線僅供演示。應為每組樣品測定生成標準曲線。 

B. 敏感性

該測定法可檢測到的小鼠 FGF-21 的最低水平為 31.2 皮克/毫升。

C. 特異性

重組蛋白的交叉反應

D. 精度

測定內精密度（測定內的精密度）CV <8%。

測定間精密度（測定之間的精度）CV <10%。

E. 恢復

通過向樣品中加入不同量的 FGF21 來確定測定的回收率。將測定中加標樣品的測量濃度與預期濃度進行比較。平均回收率為 92%。

F. 線性

為了評估分析的線性，將具有高水平 FGF-21 的樣品用 1x 分析緩衝液連續稀釋，以產生值在分析動態範圍內的樣品。

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