Laboratory Services

TSH with Reflex to FT4

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Updated Test Information:

Test Description
TSH with Reflex to FT4
Synonym(s)
TSH w/ reflex
Test ID
TSHR
General Information
Will reflex to FT4 with abnormal TSH result
Specimen Type
Serum
Alternate Specimen Type
Red, Li‑heparin, K2‑EDTA and K3‑EDTA plasma
Specimen Requirements
SST
Stability
8 days at 20‑25 °C
14 days at 2‑8 °C
24 months at ‑20 °C (± 5 °C)
Freeze only once
Methodology
electrochemiluminescence immunoassay “ECLIA”
Estimated TAT
0-2 days
Testing Schedule
Monday-Saturday
CPT Code(s)
84443
Minimum Sample Volume
1 mL
Pediatric Min. Volume (if applicable)
500 uL
Reference Range
TSH: 0.270-4.200 uIU/mL
Performing Lab
Incyte Diagnostics
LOINC Code(s)
11580-8