The official diagnosis on Spawn is that he had a virus.

However…

The GI doctor had the lab run a genetics test on him along with his liver function screen. The result was that he has alpha-one antitrypsin mutation in one allele of a gene. Basically, what this means is that he is a carrier for a genetic disorder that causes a deficiency in alpha-one antitrypsin. Because he has a certain pair of alleles (MZ), he is at slightly more risk for impaired lung and liver function. This is why the doc thinks that Spawn stopped producing bile when he had this “virus.”

At least he doesn’t have the disorder because then he’d be at a greater risk of developing emphysema and liver cirrhosis. Now, Fluffy and I have to be tested to find out which one of us (or both of us) passed this to him so that then we can inform the proper set of cousins to be tested. If a person with a Z has a baby with another person with a Z, they could have a child with ZZ (the worst case). This isn’t something you really want to pass on. 

For now, Spawn is his usual self again. Let’s just hope I can behave better than he does when having blood drawn (honestly, you’d think after having a baby I’d be over the whole needle thing but, uh, no).