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 # |
TSH with Reflex to Free T4
Test CodeTSHF
Alias/See Also
Epic: LAB9560
CPT Codes
84443
Includes
If TSH is ≥4.95, T4 Free (T4FRE) will be added.
Preferred Specimen
Specimen Type: Serum
Collection Container: Serum gel
Specimen Volume: 3 mL
Minimum Volume
0.5 mL
(Collect two full microtainers for infants <10 days old)
Other Acceptable Specimens
Specimen Type: Plasma
Collection Container: Green top (Lithium heparin)
Instructions
Centrifuge and separate cells after clot formation and within 4 hours of collection. Remove serum if testing will be delayed more than 24 hours.
Transport Container
Plastic vial
Specimen Stability
Room temperature: Unacceptable
Refrigerated (on gel): 24 hours
Refrigerated (off gel): 6 days
Frozen: 6 months
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Samples stored on gel >24 hours, unlabeled, mislabeled, wrong tube type, hemolyzed, QNS, exceeds specimen stability requirements.
Setup Schedule
Daily
Report Available
Same day
Reference Range
0.35 - 4.94 IU/mL
Performing Laboratory
Inova Laboratories
2832 Juniper Street
Fairfax, VA 22031
Last Updated: March 9, 2023
Last Review: N. Wolford, March 9, 2023