Serology rules out viruses, CSS smears rule out parasites.
脑脊液涂片排除了寄生虫.
Osmosis-微生物
Diagnosis of Measles is usually done via serology —looking for measles antibodies in blood serum, and the disease is usually most likely to occur among unvaccinated individuals.
通常经过血清学检测查找血清中的麻疹抗体可诊断麻疹,并且该疾病最可能发生在未接种麻疹疫苗的人群中。
Osmosis-消化
Labs including full blood count, liver enzymes and serology can be useful to identify the cause and an upper GI Endoscopy can identify esophageal varices in order to treat them appropriately.
Let's start with the FDA which has a page about emergency use authorizations and if you scroll down, what you see is that there are 7 that have been approved for serology.
Serology is the scientific study of serum and other bodily fluids. In practice, the term usually refers to the diagnostic identification of antibodies in the serum. Such antibodies are typically formed in response to an infection (against a given microorganism), against other foreign proteins (in response, for example, to a mismatched blood transfusion), or to one's own proteins (in instances of autoimmune disease).