Thanks for your inquiry. As per my understanding, you want to know either hyperlink fields are present in the document or not. If this is the case, please use following code example. Hope this helps you.
Document doc = new Document(MyDir + "es-alfouneh-tong-figs-R2.docx");
foreach (Field field in doc.Range.Fields)
if (field.Type == FieldType.FieldHyperlink)
Console.WriteLine("Hyperlink field is present in the document");