Itchy skin blood test can check blood routine, allergens, C-reactive protein, blood sedimentation, liver and kidney function, blood sugar, etc., the specific need to follow the doctor’s instructions. Itchy skin is most commonly associated with various skin diseases such as eczema, urticaria, tinea corporis, contact dermatitis, etc., often accompanied by different characteristics of the skin lesions, generally diagnosed by history, physical examination, skin tissue examination, some patients can check blood allergens, blood test, C-reactive protein, blood sedimentation to clarify whether there are immune factors, infections caused by the onset of the disease. In addition, a variety of other systemic pathologies such as obstructive jaundice, uremia, diabetes mellitus, etc. can also appear itchy skin symptoms, and need to improve the liver function, renal function, blood glucose and other blood tests. Itchy skin patients are advised to go to the hospital in time and follow the doctor’s instructions to complete the blood test and other necessary tests to clarify the cause of the itchy skin.