It was my diagnosis for nearly a year. Most neuromuscular specialists will give you that diagnosis if you have mostly lower motor neuron symptoms and they stay confined to your upper body for a long time at the beginning.
Mostly, the neuros just watch you and deal with your symptoms as they come. They know that some of those patients (like me) will eventually progress into full-blown ALS or PMA, so it's a waiting game.
To the original poster -- I hope your husband is luckier than I was. But the waiting can definitely be nerve-wracking.