Can anyone help me understand low sperm count?

Kas
We got his results but won't meet with the Doctor until 9/6. 
They said he had low concentration and to retest in 6-8 weeks. 
Mobility was 73%
Normal morphology was 3%
Count was 4.5 million/mL
So does that mean they are sparse oblongs? Does my husband have the Michael Phelps of sperm? I am confused. Help, anyone. I am trying to keep it together. Thanks everyone!