know your IG blood tests, a medical update

As part of the diagnostic work that our new pulmonary specialist is doing on Youngest, she has ordered lots and lots of blood tests. So many tests, in fact, that the lab called to tell us that they needed more blood. So many that the technician told me to get Youngest some fluids as his 'volume had been reduced.'
His IgG came back very low.
His IgE came back very high.
And so the doctor asked to see the subclasses. And while we wait for the subclass tests to come back I, of course, consulted the internet.
This is what I found:

Immunoglobulins (Ig) are antibodies. There are five major classes of antibodies: IgG, IgM, IgA, IgD, and IgE.

• IgG is the most abundant of the classes of immunoglobulins. It is the antibody for viruses, bacteria, and antitoxins. It is found in most tissues and plasma.
• IgM is the first antibody present in an immune response.
• IgA is an early antibody for bacteria and viruses. It is found in saliva, tears, and all other mucous secretions.
• IgD activity is not well understood.
• IgE is present in the respiratory secretions. It is an antibody for parasitic diseases, Hodgkin's disease, hay fever, atopic dermatitis, and allergic asthma).

Now, don't worry your pretty little heads. I know he doesn't have Hodgkin's or dermatitis or parasites.
The boldface is theirs, not mine.
He is most likely "a healthy child with serious chronic asthma" (as per the pulmonary specialist).
What I LOVE is the line about IgD.
What's up with that?
IgD IS A MYSTERY.

Whatev.

While we wait to find out what that all boils down to, I've spent a few days making phone calls to arrange for his bi-annual MRI.
He was born with a very fine facial paralysis, our Youngest, and it has deteriorated slightly.
Because I brought it to the attention of the pediatric neurologist who sees him once a year, she wants an MRI.
The phone calls take longer than the test itself, but it's scheduled.

He's skateboarding in the dining room right now, so don't bother fretting over it.
I'm not concerned either.
The MRI day is no walk in the park but he and I know how to get through it.

We've spent the last few days sleeping late (8:15) and wearing our pajamas until we are forced to put on clothing by the arrival of the plumber.
Or the ottoman.

Tomorrow we're having hot chocolate.
Raise the flag.