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3250SR: Thyroid Stimulating Hormone w/Serial Report Print View
TSH IA    mIU/L 

PRIMARY
1 Serum 2 (0.8) mL   Refrigerated - 4 Day(s)/Frozen - 2 Month(s)  
ALTERNATE

Differential diagnosis of primary hypothyroidism and hyperthyroidism from secondary and tertiary hypothyroidism; thyroid function test (TSH is high in primary hypothyroidism, low in hyperthyroidism); evaluate hypothyroid patients receiving replacement doses of various thyroid hormone preparations; normalization of TSH a useful guide; detect hypopituitarism; follow up low T4 newborn screen results.

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
Sunday-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
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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