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The most reliable method for assessing iodine sufficiency. The body reveals exactly how much iodine it needs.
The concept is simple: take a measured dose of iodine (typically 50mg), collect all urine for 24 hours, and measure how much iodine comes out. If the body is sufficient, most of it comes out. If deficient, the body holds onto it.
Take the loading dose
A measured 50mg dose of iodine (usually provided with the test kit).
Collect all urine for 24 hours
Every drop goes into the collection container. Completeness matters for accuracy.
Send for analysis
The lab measures total iodine in the sample.
Interpret results
Excreting 90%+ suggests sufficiency. Retaining a large portion suggests the body is holding onto iodine it needs.
The test measures what percentage of the loading dose is excreted. The standard interpretation: excreting 90% or more suggests iodine sufficiency. Retaining a large portion means the body is holding onto the iodine — a sign of deficiency.
Blood and spot urine tests only show what's circulating at that moment — a snapshot. The loading test shows how much the body actually needs by measuring retention over a full day. It's the difference between checking a gas gauge and measuring how much fuel the tank actually holds.
Some in the community note that the loading test has limitations too — it assumes a specific rate of kidney excretion that may vary between individuals. Use it as one data point among many, not the final word.
Many in our community never test and do perfectly well. They start the protocol based on symptoms, go low and slow, and let detox reactions guide their progress. The body communicates what it needs if we pay attention.
Testing can be useful for those who want objective data, are working with a practitioner, or want to track sufficiency over time. But it's not a prerequisite for starting. Given that the vast majority of the population is deficient, the real question isn't whether to supplement — it's how much and how fast.
Order from a reputable lab
Hakala Research and Doctor's Data are commonly used. The kit comes with collection materials and instructions.
Fast before the loading dose
Take the 50mg dose on an empty stomach with water. This improves absorption consistency.
Collect everything
Missing even one urination invalidates the results. Keep the collection container accessible all day.
Ship promptly
Send the sample back to the lab as soon as possible. Follow the kit's storage and shipping instructions.
Retest in 3-6 months
Comparing results over time shows progress. Excretion percentage should increase as the body approaches sufficiency.
Testing is optional. Many people begin the protocol based on symptoms and adjust from there.