Order Iodine Serum Blood Test from JustLabs for $37. Price includes lab processing at Quest Diagnostics. A one-time $18 collection fee applies per order. No insurance required.
Iodine is an essential trace mineral required for thyroid hormone production. This test measures blood iodine levels to identify deficiency or excess.
Iodine is a trace mineral that your thyroid gland needs to produce thyroid hormones (T3 and T4). These hormones regulate metabolism, growth, development, and many body functions. Your body cannot make iodine, so it must come from your diet—primarily from iodized salt, seafood, dairy, and seaweed.
Iodine deficiency is the leading cause of preventable intellectual disability worldwide and can cause goiter (enlarged thyroid), hypothyroidism, and pregnancy complications. In developed countries with iodized salt, deficiency is less common but can still occur, especially in people who avoid salt, follow restrictive diets, or are pregnant/breastfeeding.
Conversely, excess iodine (from supplements or certain medications) can also cause thyroid dysfunction. This test helps identify both ends of the spectrum.
Price
$37
Results
3-5 business days
Lab Network
Quest
Fasting
Not Required
What's Measured
What This Test Measures
This test measures the concentration of iodine in your blood serum. Results are reported in mcg/L (micrograms per liter). Serum iodine reflects recent dietary intake more than long-term iodine status.
Who Should Consider This Test
People with unexplained thyroid problems, those following restrictive diets (vegan, low-salt), pregnant or breastfeeding women, individuals taking iodine supplements, those with goiter or thyroid nodules, and anyone with symptoms of iodine deficiency.
Health Insights
Conditions Screened
Related Symptoms
When to Get Tested
No fasting required. Avoid iodine-containing supplements for 24-48 hours before testing for accurate baseline results. Recent contrast dye from CT scans can temporarily elevate levels.
Understanding Your Results
Normal serum iodine typically ranges from 40-92 mcg/L. Low levels suggest dietary insufficiency, while very high levels may indicate excess supplementation or recent iodine exposure. Results should be interpreted alongside thyroid function tests (TSH, Free T4).
What to Expect
After placing your order, you'll receive an email from Rupa Health (our lab order partner) within 24 business hours to sign a consent form and schedule your blood draw at a Quest Diagnostics location.
The blood draw typically takes just a few minutes. Results are usually available within 3-5 business days and will appear in your secure Justlabs dashboard.
Our results include reference ranges and easy-to-understand indicators showing whether your values are within normal limits.
Frequently Asked Questions
$37
Typical hospital cash price: $100–$200
+ $28 in standard lab & physician fees at checkout (no additional bills later)
$18 lab collection + $10 physician order
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