Sperm A+B of only 20% is not normal. Sperm A refers to the sperm that moves forward quickly, and B refers to the sperm that moves forward slowly.The normal value of A+B should be more than 50% to be considered as normal, or the A sperm reaches more than 25% to be considered as normal, so the sperm A+B is only 20% is not normal. There are many reasons why sperm is not normal, such as varicocele, urinary tract infection, lack of micronutrients and so on. Check semen routine need to abstain from sex for 3~5 days and then go to the hospital for examination, if there is obvious abnormality, need to clarify the cause of the disease, under the guidance of the doctor to actively take intervention measures, and regular review.