T UP
T3 (Triiodothyronine), Uptake, Serum or Plasma
EPIC Test Procedure Code: LAB2407
Synonyms:
Thyroid Hormone-binding Ratio (THBR)
T Uptake
T3 Uptake
Performing Lab:
Referral Laboratory
Patient Preparation:
This test may exhibit interference when sample is collected from a person who is consuming a supplement with a high dose of biotin (also termed as vitamin B7 or B8, vitamin H, or coenzyme R). It is recommended to ask all patients who may be indicated for this test about biotin supplementation. Patients should be cautioned to stop biotin consumption at least 72 hours prior to the collection of a sample.
Container Type:
Serum gel tube, red-top tube, or green top (lithium heparin) tube
Specimen Type:
Serum or lithium heparin plasma
Preferred Volume:
1 mL (adult), 0.8 mL (pediatric)
Minimum Volume:
0.7 mL (adult), 0.3 mL (pediatric) (Note: This volume does not allow for repeat testing.)
Collection Procedure:
Label the specimen appropriately (serum or plasma).
Store and Transport:
Room temperature
Stability:
Room Temperature - 14 days
Refrigerated - 14 days
Frozen - 14 days
Freeze/Thaw cycles - Stable x3
Unacceptable Condition:
Do not use oxalate, EDTA, or citrate plasma.
CPT Codes:
84479 - T Uptake (EAP 30015520)
Method:
Electrochemiluminescence Immunoassay (ECLIA)