Skip to main content

T4, Free (Direct)

$164.00
SHIPPING RESTRICTIONS:
Please note that lab kits cannot be shipped to
New York, Alaska, Hawaii, or internationally.
(No reviews yet) Write a Review
SKU:
LT4

Thyroxine (T4) is one of two major hormones produced by the thyroid gland, a small butterfly-shaped organ that lies flat across the windpipe at the base of the throat. The other major thyroid hormone is called triiodothyronine (T3) and together they help control the rate at which the body uses energy. Almost all of the T4 (and T3) found in the blood is bound to protein. The rest is free (unbound) and is the biologically active form of the hormone. This test measures the amount of free T4 in the blood.

CPT CODE:
84439
COLLECTION CONTAINER:
SST or red-stopper tube
COLLECTION INSTRUCTIONS:
LT4-T4-Free-(Direct).pdf
STATE & SHIPPING RESTRICTIONS:
We cannot ship lab kits to NY, AK, HI, or international
MINIMUM VOLUME:
0.5 mL
PATIENT PREP:
None
PROCESS TIME:
5 to 7 business days
REJECTION CAUSES:
Plasma Specimen, gross lipemia
SPECIMEN VOLUME:
1 mL serum
SYNONYMS:
Free T4, Direct, Serum; Unbound T4, FT4
TRANSPORT CONTAINER:
Plastic transport tube
TRANSPORT INSTRUCTIONS:
Refrigerate or freeze