In some cases, however, the sperm may need a little more help to ensure that the egg is fertilised. This can happen if the man has a very low sperm count or if there are other problems with the sperm, such as low motility or very few sperm with normal shape.
In such cases, the assisted reproduction process can be further aided by the embryologist who will select a single sperm and inject it directly into one egg. This process, known as intra-cytoplasmic sperm injection or (ICSI) gives the sperm a much better chance of fertilising the egg than through IVF alone. This technique may also be used if poor fertilization has been achieved previously with IVF.