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HelpTest ID BLOD5008 TSH Reflex
Specimen Type/Requirements
Gold (SST Serum) Tube
Specimen Volume
| Preferred Volume |
500 µL serum |
| Minimum Volume |
400 µL serum |
Stability/Transport
| Room Temperature | N/A | |
| Refrigerated | 7 days | Preferred for Transport |
| Frozen | 6 months |
Performed Test Frequency
Monday-Sunday
Additional Information
Reflex Criteria:
- If TSH is normal - no further testing
- If TSH is high - FT4 will be done - no further testing
- If TSH is low - FT4 will be done
- If FT4 is elevated - no further testing
- If FT4 is normal or low - FT3 will be done
Methodology
Chemiluminescence
Performing Lab
Sanford Laboratories Fargo-Core Lab
CPT
TSH 84443 (FT4 84439, FT3 84481)