Our bodies are complex, interconnected systems that are remarkably efficient but do occasionally malfunction. As with anything else, we require regular maintenance and checkups.

Think of it this way: If your car fails to start, a mechanic can diagnose the problem. Similarly, when couples are struggling to get pregnant, doctors can run a series of tests to help diagnose the issue. Testing involves examining the fertility of both partners, including an analysis of a woman's eggs and a man's semen to see if his corresponding sperm count is low.

Egg counts are fairly straightforward from a numerical standpoint. Women have about 1 million eggs at birth and about 300,000 remaining by puberty. A woman ovulates roughly 300 to 400 of those 300,000 in her lifetime, and those are the ones that could potentially be fertilized and develop into a child.

The numbers for women are much smaller and easier to comprehend when compared to the 15 million to more than 200 million sperm cells