In a blood test, "GRA" stands for granulocytes, which are a type of white blood cell that have small granules that release enzymes when the immune system is under attack. A complete blood count (CBC) can determine the granulocyte count, which is the result of a blood test that tells the doctor a number of things, including the cell count for each blood cell type, the concentrations of hemoglobin, and the gran CBC count. An elevated level of granulocytes is indicative of a bacterial infection, while viral infections can cause low lymphocyte counts. The normal range for each type of granulocytes is:

• Neutrophils: 1,800 – 7,800 cells per microliter of blood.
• Eosinophils: 0 – 450 cells per microliter of blood.
• Basophils: 0-200 cells per microliter of blood.

It is important to note that "GRA" can also refer to glucocorticoid-remediable aldosteronism, which is a rare form of primary aldosteronism in which aldosterone secretion is solely under the control of adrenocorticotropin (ACTH) . However, in the context of a blood test, "GRA" typically refers to granulocytes.