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Temperature |
Period |
---|---|
Room temperature |
14 days |
Refrigerated |
14 days |
Frozen |
14 days |
Freeze/thaw cycles |
Stable x3 |
Overview:
FTI is a physiologic index of metabolic activity that correlates with free thyroxine (T4).
Collection Instructions:
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.
Red-top tube or gel-barrier tube.
If a red-top tube is used, transfer separated serum to a plastic transport tube.
Room temperature.
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