Precision in the estimation of TSH is crucial to the follow-up of subjects with thyroid disorders. The preincubation of samples to remove HAMA immunoglobulins provides a way to ensure that an otherwise unsuspected rise of drop in TSH concentration will not be interpreted as either false positive or false negative.
Sample may be drawn in an SST red-top glass tube,
but not submitted in this tube.
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 the ADVIA Centaur TSH3
Reported (Analytical Time)
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.
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.