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#1
10-13-2012, 01:35 PM
 Unregistered Guest Posts: n/a
how do I convert pg/mL to ng/dL?

How to calculate a T4:T3 ratio if they are listed in different units? :
Triiodothyronine,Free,Serum010389: 5.7 (2.0-4.4; pg/mL)
T4,Free(Direct)019745: 1.36 (0.82-1.77; ng/dL)

One of your threads says, that, in order to convert pg/mL to ng/dL, you multiply by 10, and for ng/dL to pg/mL divide by 10. So, my FT3 would be 5.7 x 10 =57, and the ratio then looks absolutely ridiculous: 1.36/57 (as compared to normal in humans, 93/7, or at least 80/20)! What am I doing wrong?
#2
10-13-2012, 02:55 PM
 JohnS Moderator Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,534 Rep Power: 19
Re: how do I convert pg/mL to ng/dL?

Quote:
 Originally Posted by Unregistered How to calculate a T4:T3 ratio if they are listed in different units? : Triiodothyronine,Free,Serum010389: 5.7 (2.0-4.4; pg/mL) T4,Free(Direct)019745: 1.36 (0.82-1.77; ng/dL) One of your threads says, that, in order to convert pg/mL to ng/dL, you multiply by 10, and for ng/dL to pg/mL divide by 10. So, my FT3 would be 5.7 x 10 =57, and the ratio then looks absolutely ridiculous: 1.36/57 (as compared to normal in humans, 93/7, or at least 80/20)! What am I doing wrong?
You must have gotten that backwards. 5.7 pg/mL x 1 ng/1000 pg x 100 mL/1 dL = 0.57 ng/dL. You need to divide by 10.
#3
10-13-2012, 03:31 PM
 Unregistered Guest Posts: n/a
Re: how do I convert pg/mL to ng/dL?

Oh thanks! I am so non-mathematically minded! Would you double-check I calculated my numbers correctly? My result is (approximately):
70.5% (T4)/ 29.5% (T3)
#4
10-13-2012, 03:37 PM
 JohnS Moderator Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,534 Rep Power: 19
Re: how do I convert pg/mL to ng/dL?

Quote:
 Originally Posted by Unregistered Oh thanks! I am so non-mathematically minded! Would you double-check I calculated my numbers correctly? My result is (approximately): 70.5% (T4)/ 29.5% (T3)
I get the same ratio.

No idea whether that's good or bad. I just do conversions. No medical knowledge
#5
10-13-2012, 05:51 PM
 Unregistered Guest Posts: n/a
Re: how do I convert pg/mL to ng/dL?

Thank you for helping me get through the math!
#6
02-10-2014, 02:42 PM
 Unregistered Guest Posts: n/a
Re: Which is the smaller unit

1. Is 0.02mg/mL smaller or larger than 2.0 pg/mL
2. Is 0.02 mg/mL the same as 2ng/mL
THanks you
#7
02-10-2014, 04:53 PM
 JohnS Moderator Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,534 Rep Power: 19
Re: Which is the smaller unit

Quote:
 Originally Posted by Unregistered 1. Is 0.02mg/mL smaller or larger than 2.0 pg/mL 2. Is 0.02 mg/mL the same as 2ng/mL THanks you
0.02 mg/mL = 20 µg/mL = 20 000 ng/mL = 20 000 000 pg/mL

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