Testing & Self-Assessment
Barnes Thyroid Temperature Test
An educational self-monitoring tool
The Barnes Basal Temperature Test is a self-monitoring method, not a diagnostic replacement for laboratory testing. Track your results and discuss them with a qualified healthcare provider.
History
The basal body temperature test was popularized by Dr. Broda Barnes, an American physician who proposed in the mid-20th century that resting body temperature, measured immediately upon waking, could serve as a simple at-home indicator worth tracking alongside standard thyroid lab work. It remains a widely discussed self-monitoring method in health education today, though it is not a substitute for laboratory thyroid testing.
Step-by-step instructions
- Place a thermometer within reach of your bed before going to sleep.
- Immediately upon waking — before getting up, talking, or any activity — place the thermometer under your arm (axillary) or as directed by your healthcare provider.
- Stay still and keep the thermometer in place for a full 10 minutes.
- Record the reading and the date before getting out of bed.
- Repeat at the same time each morning for at least 5–10 consecutive days.
- Bring your recorded results to a qualified healthcare provider for interpretation.
Printable tracking chart
Print this chart to record your readings by hand.
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Digital tracking
Enter your readings below to see them plotted over time. This stays in your browser only — nothing is uploaded or shared.
No readings saved yet. Readings are stored only in this browser, on this device.
Readings are saved only in this browser's local storage — they are not sent anywhere and will not appear on any other device.
Stephen's educational commentary
Awaiting Stephen's Review
Stephen's commentary and interpretation guidance for this self-monitoring tool has not yet been added.
This is an educational self-monitoring tool, not a standalone diagnostic test. It does not replace laboratory testing (such as TSH, free T4, or free T3) or evaluation by a qualified healthcare provider.