| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # |
T3 Free
MessageChemistry
Test Code
LAB137
Alias/See Also
Free T3
CPT Codes
84481
Preferred Specimen
Gold top (serum separator tube)
Minimum Volume
Whole blood: 700 uL (TWO full red-top microtainers or two full light green-top microtainers).
Serum/plasma: 300 uL
Serum/plasma: 300 uL
Other Acceptable Specimens
Red Top and light green top (lithium heparin plasma) acceptable
Specimen Stability
Refrigerated: 7 days
Frozen up to 4 weeks
Frozen up to 4 weeks
Report Available
Same day
Limitations
Thyroid hormone autoantibodies in serum samples may cause interference in free-hormone
immunoassays. Results which are inconsistent with clinical observations indicate the need for additional testing.
immunoassays. Results which are inconsistent with clinical observations indicate the need for additional testing.
Reference Range
2.8 - 5.3 pg/mL
Performing Laboratory
Hoag Newport
