Parathyroid function

[Dawnsarah]

In 2010 I had my PTH blood test.  At the time I was taking calcium 2720mg with 3600IU vit D.
                                 *However I always fast 13 hrs before all blood tests*
PTH-I                55.9 pg/ml
Calcium              9.1 mg/DL
Vit d 25OH        51    ng/ml
Vit D 25OHD2   <4   ng/ml (indicates both endogenous (diet) and supplementation sources.)

    This past year my calcium and D was reduced and I stopped taking the calcium and multi-viamin for 2 weeks before this test.( I did continue 1000 IU Vit D)

4/20/2012

Calcium               9.4 mg/DL
Magnesium          2.0 (H)
Vit D 25OH          50.8 ng/ml

My question:
1)  Did I skew the first test results with the high doses of calcium and D even though I fast for all Bl. tests?
2)  How can the second results be so high?  Is the calcium coming from bone resorption?  Parathyroid dysfunction?

I am a total thyroidectomy person whose HR went into bradycardia and RBBB and constant PVC's since some months after surgery.   I had a slight increase of L-T4 616mg to 660 mg  on June 12, 2012.  

3) Isn't this a low dose for such results?  I am now 140 LBS, even though I still look great.

Recent labs  7/26/ 2012  TSH =1.18, FT4= 1.25  

Today I had  the first normal HR of 72 BPM at 1:00 pm but 8:00 pm back to irregular and 50 BPM.  
Thank you for your help Dr Lupo,   Sometimes I wished I lived in Florida, but how can you stand the humidity.   Sincerely

[Dawnsarah]

Thank you for allowing me to clarify my question:                              

1.) I don't understand how my calcium is normal when taking high doses of supplements and now still in the same range since I discontinued them.  I don't want it coming from my bones.

2.)I thought a replacement dose for a person with  TT is aroud 150mcg qd.  I take 660mcg per week and have a great TSH. Does this mean I could have remaining thyroid tissue?

    I feel good on this dose, my heart is generally calm with a decent HR 60-65 at rest, it does not dip to 49-55 unless a feeling of deep fatigue occurs after work or at night.  The electrical conduction is irreversable, I just want to watch my bone density now.

    P.S.  Right again, i found magnesium stearate in the super B complex that I take QOD.

   I hope you know that you are the essence of what a true physician is and if more MD's exhibited your compassion people would be able to trust them again.

Thank you for putting up with sometimes ridiulous questions, I promice not to become a frequent flyer   Sincerely

[Mark Lupo, M.D.]

The Magnesium was the only abnormal test result - and just slightly high - would consider repeating to see if still high and look at all supplements to see if Mg is present). PTH/calcium/D all normal.  Thyroid labs normal on current LT4 (not sure I understood the 616mg and 660mg dose -- do you mean a total of 660mCg per week?)