T7

T7, Serum or Plasma

EPIC Test Procedure Code: LAB2410

Synonyms:
Thyroid Profile
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 (heparin) tube
Specimen Type:

Serum or lithium heparin plasma

Preferred Volume:
1 mL
Minimum Volume:
0.7 mL (Note: This volume does not allow for repeat testing.)
Collection Procedure:

1. Indicate serum or plasma on the request form.
2. 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:

84436 - T4 - Send Out (EAP 30015150)
84479 - T Uptake (EAP 30015520)

Method:
Electrochemiluminescence Immunoassay (ECLIA)
Test Includes:
Free thyroxine index; T3 uptake (THBR) and thyroxine (T4).

Lab Personnel

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