| 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 # |
T4 (Thyroxine), Total Only, Serum or Plasma
Test CodeT4 - NCMC
CPT Codes
84436
Preferred Specimen
1 mL serum from SST
Minimum Volume
0.5 mL
Note: For neonate requirements see Neonate Minimum Blood Volumes
Note: For neonate requirements see Neonate Minimum Blood Volumes
Other Acceptable Specimens
1 mL plasma from Green top (Lithium Heparin) or 1 mL serum from Red Top
Specimen Stability
| Specimen Type | Temperature | Time |
| Serum SST | Refrigerated | 7 days |
| Red Top – Separated* | Refrigerated | 7 days |
| Plasma Li Hep | Refrigerated | 7 days |
*Centrifuge and aliquot into a plastic vial.
Methodology
Chemiluminescence Immunoassay
Setup Schedule
Monday through Sunday; Continuously
Report Available
Same day
Reference Range
Male: 4.5-12.1µg/dL
Female: 4.8-13.9 µg/dL
Female: 4.8-13.9 µg/dL
Performing Laboratory
North Colorado Medical Center Laboratory
