Thyroid Panel with TSH

CPT: 84436, 84443, 84479
Thyroid

What This Test Measures

Panel including T3 Uptake, Total T4, Free T4 Index, and TSH for comprehensive thyroid function assessment.

Preparation

No fasting required
If taking T3 medication (liothyronine/Cytomel), draw at least 12–24 hours after your last dose for an accurate TSH. If splitting T3 doses, draw at your natural trough. Biotin supplements — even in multivitamins — can falsely skew thyroid results: discontinue at least 2 days before testing. No fasting required unless combined with other tests.
💬 Patient Community Notes

TIMING: Take your thyroid meds as usual the day before, then draw blood first thing in the morning BEFORE taking that day's dose. TSH is highest early AM and drops throughout the day. The thyroid patient community (STTM and others) notes that TSH alone is unreliable — always order Free T3 and Free T4 alongside it. Many functional practitioners consider optimal TSH 0.5–2.0 mIU/L. On T3 therapy, TSH will be suppressed; this is expected and not hyperthyroidism. These notes reflect common practices in thyroid/functional medicine communities.

Reflects common practices in thyroid, BHRT, and functional medicine communities. This may differ from standard clinical guidelines. Not medical advice — always discuss with your provider.

General guidelines only. Requirements vary by lab and individual. Confirm with your provider before adjusting any medications.

Turnaround Time

Varies by lab

Clinical Notes

Common panel; exact components vary by lab

ICD-10 Codes

Common diagnosis codes associated with this test. Codes are assigned by your provider.

E03.9Hypothyroidism, unspecified
E05.90Hyperthyroidism, unspecified
E06.3Autoimmune thyroiditis
R53.83Other fatigue
Z79.899Other long term drug therapy

Self-Pay Pricing

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HealthLabs.com

Uses Quest and Labcorp; strong panel bundling; results in 1-3 days

$39.00Order
Ulta Lab Tests

Uses Quest Diagnostics network; generally lowest DTC prices; not available in NY, NJ, RI

$48.95Order
Life Extension

Uses Labcorp network; known for supplement company; competitive lab test pricing

$49.00Order
DirectLabs

Uses Quest Diagnostics network; good panel pricing; established DTC provider

$49.00Order
Walk-In Lab

Uses both Quest and Labcorp networks; competitive pricing; broad test selection

$49.00Order
Personalabs

Uses Quest and Labcorp; no hidden draw or facility fees; moderate pricing

$55.00Order
Request A Test

Uses Quest and Labcorp networks; offers both individual tests and discounted panels

$59.00Order
Private MD Labs

Primarily uses Labcorp network; popular for hormone panels; higher individual test prices

$69.00Order
Labcorp OnDemand

Labcorp consumer-direct platform; 2,000+ locations; results in 1-3 days

$69.00Order
QuestDirect

Quest Diagnostics consumer-direct platform; results in 1-2 days; 2,100+ locations nationwide

$79.00Order
empowerDX

At-home self-collection. Finger prick or swab — no lab visit required. Results via secure portal within 10 business days.

$129.00Order

Lab Codes

Proprietary codes used by each lab for this test.

LabCorp
001974(order)
LabCorp
000620(order_code)
Quest Diagnostics
899(order)

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Related Tests

TSH (Thyroid Stimulating Hormone)

CPT: 84443

Free T4 (Thyroxine, Free)

CPT: 84439

Free T3 (Triiodothyronine, Free)

CPT: 84481

Reverse T3 (rT3)

CPT: 84482

Free T4 Index (T7)

CPT: 84479, 84436

TRAb (TSH Receptor Antibody)

CPT: 86800

For informational purposes only

This page is for educational and research purposes only and does not constitute medical advice, diagnosis, or treatment recommendations. ICD-10 and CPT codes are assigned by your healthcare provider. Always consult a qualified healthcare provider before ordering any lab test or making decisions about your health.