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Laboratory Test Detail

Last Updated: April 23, 2024 @ 9:13 am

2190

TSH w/Free T4 Reflex

Specimen:Collect:
  • One SST

Also Acceptable:
  • One Green Top (Li Heparin)
  • One Lavender (EDTA)
  • One Pink Top (EDTA)
  • One Red Top
Submit:
  • 2 mL (Min:1 mL) Serum . Submit Refrigerated. Submit in a Standard Transport Tube.

Also Acceptable:
  • 2 mL (Min:1 mL) Plasma . Submit Refrigerated. Submit in a Standard Transport Tube.
Special Handling:
  • Allow specimen to clot completely at room temperature
  • Avoid repeated freeze and thaw cycles.
  • For patients receiving therapy with high biotin doses (>5 mg/day), no laboratory test specimen should be collected until at least 8 hours after the last biotin administration.
  • Minimize air exposure
  • Separate from cells ASAP
  • If the TSH is abnormal, then the Free T4 (test# 2146) test will be performed. Additional charges will apply.
Rejection Criteria:
  • Grossly Hemolyzed Samples
Stability:Ambient: 2 Hour(s); Refrigerated: 7 Day(s); Frozen: 1 Month(s); Incubated: Unacceptable
Methodology:
  • Electrochemiluminescence Immunoassay (ECLIA)
Performed:Mon-Fri
Reported:1-3 Day(s)
CPT Codes:
  • 84443
Interpretive Data:General Reference Range : 0.270-4.20 uIU/ml
Male Reference Ranges
  • 0 - 1 year(s) : 0.40-8.6 uIU/ml
  • 1 - 2 year(s) : 0.36-7.6 uIU/ml
  • 2 - 4 year(s) : 0.33-6.7 uIU/ml
  • 4 - 5 year(s) : 0.34-6.1 uIU/ml
  • 5 - 6 year(s) : 0.34-6.0 uIU/ml
  • 6 - 7 year(s) : 0.35-5.8 uIU/ml
  • 7 - 8 year(s) : 0.35-5.7 uIU/ml
  • 8 - 9 year(s) : 0.35-5.6 uIU/ml
  • 9 - 11 year(s) : 0.36-5.5 uIU/ml
  • 11 - 12 year(s) : 0.36-5.4 uIU/ml
  • 12 - 150 year(s) : 0.270-4.20 uIU/ml

Female Reference Ranges
  • 0 - 1 year(s) : 0.40-8.6 uIU/ml
  • 1 - 2 year(s) : 0.36-7.6 uIU/ml
  • 2 - 4 year(s) : 0.33-6.7 uIU/ml
  • 4 - 5 year(s) : 0.34-6.1 uIU/ml
  • 5 - 6 year(s) : 0.34-6.0 uIU/ml
  • 6 - 7 year(s) : 0.35-5.8 uIU/ml
  • 7 - 8 year(s) : 0.35-5.7 uIU/ml
  • 8 - 9 year(s) : 0.35-5.6 uIU/ml
  • 9 - 11 year(s) : 0.36-5.5 uIU/ml
  • 11 - 12 year(s) : 0.36-5.4 uIU/ml
  • 12 - 150 year(s) : 0.270-4.20 uIU/ml


Biotin in specimens taken from patients on high-dose biotin therapy or supplements may intefere with this test and cause inaccurate test results. It is recommended that for patients receiving therapy with high biotin doses (> 5 mg/day), no laboratory test specimen should be collected until at least 8 hours after the last biotin administration.
Components:
  • 2190 - TSH w/FT4 Reflex
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