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NORMAL SERUM LEVELS OF TOTAL T4
FOR EQUINE
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Type of Horse
TOTAL T4 (ng/mL)
Stallions
7 – 25
Horses in training
12 – 25
Broodmares, open
12 – 25
Broodmares, pregnant:
First Trimester
12 – 25
Second Trimester
9 – 25
Third Trimester
7 – 25
Normal 2-day-old foal
150+
Sucklings, in June:
MEAN
Less Than One Month
41.5
One Month
27.0
Two Months
28.8
Three Months
26.2
Four Months
21.9
Five Months
24.1
Weanlings, in September
25.0
Yearlings, in February
21.0
TOTAL T3 (adult horse): 0.5 – 6.0 ng/mL

When retesting for TOTAL T4, sample ~24 hours post thyroid supplement dose. Retest 7-14 days after starting supplement.

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