white blood cell count question

I had a post up the other day about this, but wanted to change my question just a bit so thought I'd write a new one.

basically,

do you think that the blood cell count range levels change by month and not just years.

here's what I mean:
my son (4 1/2) at his last CBC had a 5.2 for white blood cell count (which is just shy of the lower end range of 5.5. His llmd said she's not worried; that lyme and treatment can do that, and he had 4 months abx and one month fluconazole- and we'll continue to monitor all his levels of course.)

so, a 4 year old low end range of wbc is 5.5
a 5 year old low end range of wbc is 5.0

I would think that a four and a half year old low end range for wbc would be 5.25.

I mean if he was 4 years and 11 months old, would his low end range really be 5.5 and then four weeks later, bam, down to 5.0?

I think it must taper off incrementally, and therefore probably be 5.25 at 4 1/2.

This is me trying to tell myself that at four and a half years old, his wbc count of 5.2 is really not that much lower than the 5.25 I'm thinking the low end range must be. (even though honestly the 5.2 isn't that much lower than 5.5 to begin with I suppose.)

Well, the llmd said don't worry (but I'm a worry wort), yet I have read how lyme, and long Rx abx and yeast (which he's been dealing with) can cause lower counts, so I'll try not to worry.

He's feeling better than ever actually! I would say 95-99% symptom free now for the past month, so I do believe he's okay. We're switching to herbs in fact when we get home from our vacation.

Anyway,this got long! but thanks for any thoughts!

thanks Traveler! yeah, I'm definitely not a scientist either, but just think it makes sense that it would gradually reduce in number.

thanks for answering! (I tried to shorten my post the 2nd time, but no such luck!)

Stacestar: Even if it's supposed to be 5.5 - personally I wouldn't worry about 5.2. It's so close! If you test again and it drops, then maybe look into it.

And, what you said makes sense. At 4 years and 364 days it's supposed to be 5.5 and the next day 5.0? I don't think so...

thanks Girlie and Razzle too!
I agree that the 5.2 is so close to 5.5 that like the llmd said, I shouldn't worry myself.
and at the time he was last tested (two weeks ago) by then he'd had lyme for 11 months (most likely 11) and four months of abx and one month of fluconazole and a couple or more months of yeast (again, read that that alone can lower your white blood cell count), so I'm not surprised he's at the lower end a bit.
The time before last when he was tested was May (about 9 weeks previous) his count was at 5.7, so just a little higher, but only by .5 percent which isn't too much of a difference really.

and Razzle, that's interesting that even seasonal variation can happen. I hadn't heard that, very interesting.
good point to make too, that it's the averages, statistics, and of course to pay more attention to the trend.

I read that echinacea and goldenseal can help improve white blood cell count. anyone heard that? or have other ideas?
I read that selenium and vitamin C are good for that too.

Turns out we have a new herb shop in my town with an herbalist on staff, so I'll be going for advice/ideas about the echinacea stuff when we return home from our vacation next week.