What are the reasons for a man's particularly low sperm density?

Patient's question:

My husband got his sperm tested today. The density was only 4.42, with only 33% of the sperm being A, B, or C grade. I have low folic acid and low suicidal lymphocytes. The doctor said with such sperm quality, it's impossible for me to get pregnant. But I've actually conceived four times. However, each time it stopped developing after two months. What could be the reason? Can we do in vitro fertilization? What is the success rate?
Follow-up question 1: What is the success rate of in vitro fertilization? What preparations do we need to make before it?
Follow-up question 2: Hello. Thank you for your hard work. Can you tell me how to improve a man's sperm quality?

Doctor's answer:

Most male infertility is caused by a lack of zinc and selenium in the body. Taking action through both diet and zinc and selenium supplements can yield significant results. Modern research has found that trace elements, particularly zinc and selenium, play a crucial role in male reproductive health. Effective and reasonable supplementation can help prevent and support the treatment of male infertility and prostatitis and other conditions. It is recommended to seek examination and treatment at a formal hospital. Wishing you good health!

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