Background : Double diabetes (DD) is the term used to describe situations in which a patient exhibits characteristics that are a combination of type 1 diabetes mellitus(T1DM) and type 2 Diabetes Mellitus (T2DM) a large epidemiological study found that 25.5% of people with T1D also had the metabolic syndrome. A new protein hormone called asprosin is predominantly released by white adipose tissue. It was initially discovered in 2016 . Asprosin is important diagnoses marker for insulin resistant in diabetes patients ,additionally is very important denotation about early diagnoses of type 2 diabetes. Objectives: The current study aims to find predictive significance of diagnosis a double diabetes by evaluating the asprosin in the blood serum of groups under study . Subjects and methods : Eighty individuals participated in this study and were classified into two groups. The first group(G1) consisted of (40) patients of double diabetes ,the second group (G2) which represented the control group consisted of (40) subjects ,the age range of under study groups were(18-60)years . Whole blood was used in the determination of HbA1c . Samples were centrifuged , Serum that obtained was used to Assessment the other Biochemical markers. The technique employed in the determination of serum asprosin level was the quantitative sandwich enzyme linked immune sorbent assay(ELISA). Results: This study revealed a significant elevation in serum asprosin levels in (DD) patients(n =40) comparing to control subjects (n = 40) (p value < 0.05) . The ROC curves analysis for serum asprosin level when used as test for diagnosis subjects into of double diabetes cases (G1) When compared with control groups (G2) the area under the curve (AUC) for serum aspirin was 0.940 with a confidence interval (95% CI) and the lower band limit of the sensitivity versus specificity curve (0.867) and the upper band limit (1.000). Conclusions: Asprosin level could be a used as a novel biomarker of double diabetes (DD) and may contribute to the early diagnosis of diabetes.