Reverse Tri-iodothyronine (RT3)
Thyroxine Free, Direct Dialysis (FT4)
Tri-iodothyronine Free (FT3)
Thyroid-Stimulating Hormone (TSH)
Thyroid Peroxidase (TPO) Ab
Antithyroglobulin Ab (TAA)
Iron Binding Capacity
% Saturation (calculated)
Vitamin D, 25-OH, Total
You should fast for 8 hours before collection of the specimen. Fasting is defined as no consumption of food or beverage other than water for at least 8 hours before testing. Specimens should be collected in the morning since iron values decrease by 30% during the course of the day and there can be significant interference from lipemia. Samples should not be collected during or soon after the administration of heparin. In patients receiving therapy with high biotin doses (ie, > 5 mg/day), no sample should be taken until at least eight hours after the last biotin administration.
Estimated turnaround for results is 8 business days. If confirmation testing is required, the estimated time may be extended.