###Human: What does the blood test taken for sudden hearing loss indicate? ###Assistant: Hello. I went through your post and investigations (attachment removed to protect patient identity), there are two things which I presume you think are abnormal. CK (creatine kinase), it is an enzyme produced by heart muscle and skeletal muscle. So, is elevated in people with muscle or heart disease but low levels have no significance and are common in people with a sedentary lifestyle who do not exert much. Anti-histone antibodies are seen in people with drug-induced lupus so if one does not have other features of lupus as in your case the hearing loss is not a criterion for lupus (ACR criteria for SLE). It has little or no importance. I think there is a possibility of Meniere's disease for which you should get investigated that can cause sudden temporary hearing loss.