synthroid question with labs (long)

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Can synthroid go bad? My current Rx of synthroid is for a 90 day

supply. I keep it in on the night stand by my bed so I can take it

first thing in the morning without forgetting it (since I am very

forgetful anymore these days. I was curious to see if that might be

a part of why I have been feeling even more run down than usual since

I made it to the end of my first 90 days on the synthroid. But then

again, what is with my labs!

Check this out:

First set of labs from Dec 06 that got me finally sent to Endo:

TSH 0.52 (0.34-4.82)

FT4 0.69 (0.7 - 1.9)

Labs done at Endo on Feb 07:

T3 Total 136 (60-181)

T-4, FREE 1.1 (0.8-1.8)

TSH 0.55 (0.40-5.50)

Put on 50 mcg Synthroid after PCM forced the issue with Endo. Endo

said " labs were fine, no longer needed to be seen " . PCM originally

sent me to the INS approved Endo on the notion I needed to be ruled

out for Secondary Hypothyroidism. Endo totally blew that off as it

is very rare. Honestly after finding a TSH, T4, T3 results chart, I

agree with what PCM was seeing.

Labs from Apr 07 while on 50 mcg Synthroid:

TSH Ultra 0.13 (0.34-4.82)

FT4 1.4 (0.9-1.7)

and tested for Thryroid antibodies with results of:

Thyroglobul AB <1:10

Interpretations:

Interpretations reference range: <1:10 Normal

THY MICRO AB . . . . . <1:100

Interpretations:

Interpretations reference range: <1:100

Test performed by Hemagglutination

(I have no idea what all that interpretations stuff means other than

my PCM said I don't have antibodies present so I do not have

Hashimotos)

Kept on 50 mcg and retested labs on May 09, 2007:

T3 FREE 3.3 (2.0-4.4)

TSH Ultra 0.08 (0.34-4.82)

FT4 1.6 (0.9-1.7)

I have an appointment tomorrow with a new Endo since I finally got my

second opinion referral. Is there something glaring right at me that

I cannot see for lack of my understanding?

If I do have Secondary Hypothyroidism, would this explain why my TSH

is continuing to bottom out while still on Synthroid? Or has my

batch of pills expired due to having a 90 day supply that perhaps has

lost it's umph?

HELP me understand if you can!!

Thanks,

Kathy