help to interpret lab results, please - Thyroid UK

Thyroid UK

140,947 members166,079 posts

help to interpret lab results, please

5 Replies

I have had labs on both Armour Thyroid (5 grains daily) and Erfa Thyroid (5 grains daily). I had been on both drugs for three months before going to the lab (in June and September 2015 respectively). These are the results:

Armour (5 grains):

TSH <0.01 (ref 0.2-4.0)

FT4 1.1 (0.8-1.8)

FT3 2.9 (2.2-4.2)

Erfa (5 grains):

TSH <0.01 (same ref ranges)

FT4 1.1

FT3 4.1

I always go to the lab 24 hours after taking NDT.

My FT3 levels were at the upper normal range 24 h after taking Erfa, but barely midrange 24 h after taking Armour. Should I interpret this to mean that Armour does not work optimally for me, or that I am overmedicated on Erfa? I guess those results mean that my FT3 levels are twice the upper normal range right after taking Erfa...

Would it be a good idea to have labs right after taking Armour Thyroid, instead of waiting 24 hours? Or should I raise the dose? Or just forget about Armour, and go for Erfa instead?

Read more about...
5 Replies
shaws profile image
shawsAdministrator

Erfa is the one that appears to be giving you a higher FT3 at the top of the range and it is FT3 which is the most important range.

in reply toshaws

OK, thank you!

Clutter profile image
Clutter

Anna69, FT3 was much better on Erfa which is surprising because there is slightly less T4 and T3 in Erfa than in Armour. Anyone taking T3 is temporarily overmedicated for a few hours as the T3 dose peaks, that's the way T3 works. I was told +20% after 24 hours which would make your estimated circulating FT3 4.92 max, and lower in between doses as T3 leaves the blood stream. If you measure thyroid levels within a couple of hours of taking NDT you will see high FT3, and possibly high FT4, as the T4 and T3 peak in serum. A member's FT3 was 15 a couple of hours after taking 2.5 grains and 5 after leaving 24 hours.

You should choose the brand you felt best on. If that's Erfa and you feel overmedicated with FT3 4.1 reduce dose.

___________________________________________________________________________________

I am not a medical professional and this information is not intended to be a substitute for medical guidance from your own doctor. Please check with your personal physician before applying any of these suggestions.

in reply toClutter

OK, thank you! No, I actually feel very well on my current dose of Erfa. Armour has not worked for me, unfortunately, as that is the brand favoured by my hormone doctor. Luckily, Erfa is readily available in several Belgian pharmacies. I understand that is also the brand prescribed by the doctors in Thierry Hertoghe's Brussels clinic...

Clutter profile image
Clutter in reply to

Anna69, flipping doctors with their 'preferred' brands :x What best suits the patient should be the preference.

Not what you're looking for?

You may also like...

switched from Armour to Erfa, not sure what to think

I have a question on NDT: I was put on Armour in 2012 but, this summer, my doctor decided it was...

the best time to measure FT3 levels?

OK, so I have a question about so called normal lab results. The reason I am asking is that I have...

TSH and FT4 levels on NDT?

I have been taking Thyroid-S for over a year, after finding that neither Armour nor Erfa worked...

need help to interpret labs...?

Ok, so I wanted to ask you about labs...24 h urine analysis to be more exact. I am seeing a doctor...

Help with Lab results

Recent addition of T3 to Levo several months ago Gradually increasing from 5 mcg to 25 mcg. For...
jarock profile image

Moderation team

See all
SlowDragon profile image
SlowDragonAdministrator
PurpleNails profile image
PurpleNailsAdministrator
RedApple profile image
RedAppleAdministrator

Content on HealthUnlocked does not replace the relationship between you and doctors or other healthcare professionals nor the advice you receive from them.

Never delay seeking advice or dialling emergency services because of something that you have read on HealthUnlocked.