Thyroid Panel with TSH

Quest Diagnostics

Sample type: Serum

Requires fasting: No

Phlebotomy required

Details

Thyroid Panel with TSH - This panel provides an assessment of thyroid function and includes tests for thyroid stimulating hormone (TSH), total thyroxine (T4), triiodothyronine (T3) uptake (T3 resin uptake), and free T4 index. This panel may be useful for evaluating thyroid function when pituitary disease is not suspected. The results of the panel may help in the diagnosis of hyperthyroidism and hypothyroidism. T3 and T4 are hormones derived from the thyroid and released into the blood to regulate metabolism. Both T3 and T4 are produced in response to TSH from the pituitary gland. T4 circulates mostly bound to plasma proteins, with a small amount unbound and available for biological activity. To estimate free T4 concentration, a total T4 test and T3 uptake test are used to calculate the free T4 index. A normal TSH result excludes most cases of primary overt thyroid disease. Therefore, a cascaded testing approach (test code 15102) may be preferable for evaluating and monitoring thyroid function. This panel does not identify T3 thyrotoxicosis, which requires measurement of free T3. The results of this panel should be interpreted in the context of pertinent clinical and family history and physical examination findings.

Biomarker summary

Thyroid-Stimulating Hormone
Free T4 Index (T7)
T3, Uptake
T4 (Thyroxine), Total

Additional details

Estimated days for results: Results should be available in 2 - 5 business days after the sample is collected

Details

Thyroid Panel with TSH - This panel provides an assessment of thyroid function and includes tests for thyroid stimulating hormone (TSH), total thyroxine (T4), triiodothyronine (T3) uptake (T3 resin uptake), and free T4 index.

This panel may be useful for evaluating thyroid function when pituitary disease is not suspected. The results of the panel may help in the diagnosis of hyperthyroidism and hypothyroidism.

T3 and T4 are hormones derived from the thyroid and released into the blood to regulate metabolism. Both T3 and T4 are produced in response to TSH from the pituitary gland. T4 circulates mostly bound to plasma proteins, with a small amount unbound and available for biological activity. To estimate free T4 concentration, a total T4 test and T3 uptake test are used to calculate the free T4 index. A normal TSH result excludes most cases of primary overt thyroid disease. Therefore, a cascaded testing approach (test code 15102) may be preferable for evaluating and monitoring thyroid function.

This panel does not identify T3 thyrotoxicosis, which requires measurement of free T3. The results of this panel should be interpreted in the context of pertinent clinical and family history and physical examination findings.

What type of sample is required for this test?

2 mL serum

Test Resources

For more information, please consult your healthcare provider.

Average sample processing time

2–5 business days

Health categories

Thyroid

Patient instructions

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.

Blood Draw Options with Fullscript
Fullscript offers several convenient phlebotomy options to complete your lab testing:

Quest Diagnostics Patient Service Centers (PSC)

Location: Visit a nearby Quest Diagnostics Patient Service Center.
Cost: $10 sample collection fee (paid during lab order checkout).
Scheduling: Schedule your appointment here. Appointments are recommended to reduce wait times. Walk-ins are accepted, but may experience delays. Aim to arrive 10 minutes before your appointment.
Collection Instructions:

Bring a valid ID.
Bring your digital or printed requisition form, available in the Labs tab of your Fullscript account.

Check-in: Scan the QR code from your confirmation email or follow kiosk instructions.
More Info: Quest Diagnostics blood draw guide

Getlabs Mobile Phlebotomy

Location: Sample collection at your home or office.
Cost: $85 sample collection fee (paid during lab order checkout).
Availability: Available in most locations – enter your ZIP code during checkout to confirm.
Scheduling: Schedule your appointment here through your Fullscript account.
Collection Instructions: