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899: TSH Print View
TSH IA    mIU/L 

PRIMARY
1 Serum 1 (0.7) mL   Frozen - 28 Day(s)/Refrigerated - 7 Day(s)/Room Temperature - 7 Day(s)  
ALTERNATE

For differential diagnosis of primary, secondary, and tertiary hypothyroidism. Also useful in screening for hyperthyroidism. This assay allows adjustment of exogenous thyroxine dosage in hypothyroid patients and in patients on suppressive thyroxine therapy for thyroid neoplasia.

Patient Preparation:
Specimen collection after fluorescein dye angiography should be
delayed for at least 3 days. For patients on hemodialysis, specimen
collection should be delayed for 2 weeks. According to the assay
manufacturer Siemens: "Samples containing fluorescein can produce
falsely depressed values when tested with ADVIA Centaur TSH3 Ultra
assay."
Setup Schedule
Tuesday-Saturday

Reported (Analytical Time)
Same day

CPT Code
84443

The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.

Notes
Transport Temperature: Room Temperature Reject Criteria: Plasma According to the assay manufacturer Siemens: "In general, the fluorescein clearance (requires) about 48 to 72 hours." For patients in "end stage renal disease on hemodialysis, the elimination will be delayed likely by several cycles of hemodialysis. Assuming the dialysis cycle serves as one half-life (and) using the rule of thumb that 5 half-lives are required to completely eliminate a compound, two weeks is conservative (if) dialysis is performed 3 times per week."






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