Lab Eval Thyroid Hormone Flashcards
1
Q
Most important test for thyroid function and screening test
A
TSH
2
Q
Normal TSH range
A
0.5-5.0 mIU/L
3
Q
Free T4 normal range
A
0.9-2.3 ng/dL
4
Q
Total T4 normal range
A
5.5-12.5 μg/dL
5
Q
Total T4 is affected by
A
TBG abnormality
6
Q
Free T4 (FT4) biologically active form of T4; requires separation from carrier protein using
A
EQUILIBRIUM DIALYSIS
7
Q
T3 uptake (T3U) normal range
A
25-38%
8
Q
Reflects quantity of TBG and hormone attached to it
A
T3 uptake (T3U)
9
Q
Formula for FTI
A
FTI = Total T4 x (T3 uptake / mean normal T3 value)
10
Q
Normal FTI range
A
5.4 - 9.7
11
Q
Free T3 normal range
A
210-440 pg/dL
12
Q
Total T3 normal range
A
80-200 ng/dL
13
Q
Biologically active form of T3
A
FT3
14
Q
T3 is usually tested when levels of TSH and FT4 are?
A
TSH ↓ and FT4 is N
15
Q
RAIU normal range at 24 hours
A
5-30%
