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Test Code FT4 T4, Free

Specimen Type

Blood

Preferred Collection Container

GRN-PST

Acceptable Collection Container

GRN-PST, SST, R-NoGel, G-NoGel

Collection Instructions

Routine venipuncture

Collection Volume

5 mL

Minimum Collection Volume

1 mL

Testing Volume

0.5 mL (500 ul)

Rejection Criteria

Inadequate labeling, improper collection.

Specimen Storage and Stability

Stable up to 48 hours at 2-8 C

Day(s) and Time(s) Performed

Monday through Sunday, 24 hours

EPIC Code

LAB127

Turn Around Time

8 hours

Lab Department

Chemistry

Alias

Thyroxine, Free; T4, Free, Serum

Ordering Info

Significant interference from biotin can be observed with this assay. It is recommended that patients refrain from taking any supplements containing biotin for 24 hours before having this test drawn.