Another useful do-it-yourself-at-home tool can be found right in your medicine cabinet. Measuring your temperature with an oral digital thermometer can be a useful tool to help determine your thyroid status. It is another measure, like blood pressure or blood sugar, that’s a simple assessment you can perform on your own and track over time.
To assess and track your thyroid status, take your temperature immediately upon arising.
Normal oral temperature is 97.3ºF. Temperatures consistently below this suggest hypothyroidism.
Body temperature normally fluctuates within a range. Normal oral temperatures range from 96.3ºF to 99.9ºF and vary predictably with the time of day.
Body temperature undergoes predictable circadian variation. Over a 24-hour cycle, the highest temperature occurs at around 8:00 p.m. and the lowest at around 4:00 a.m. It is the temperature low that is most reflective of thyroid status.
Checking your oral temperature immediately upon awakening best approximates your thyroid status. – Tweet this!
Oral temperature taken immediately upon arising that’s consistently less than 97.3ºF is suggestive of hypothyroidism; the lower the temperature, the more likely it represents hypothyroidism.
Increased body temperature suggests hyperthyroidism (as well as other conditions, including ovulation in women, exercise, and fever).
Oral temperatures are best used as a gauge of thyroid status alongside symptom assessment and thyroid lab tests that include TSH, free T3, free T4, and, ideally, reverse T3.
Temperature should not be assessed during calorie restriction, fasting, or sleep deprivation. – Tweet this!
You can use oral temperatures to also gauge the adequacy of ongoing thyroid hormone replacement. Say you take 60 mg (1 grain) of Naturethroid but your immediately-upon-awakening oral temperature rises from an average of 95.5 degrees F to 96.2 degrees F—still too low! Provided this values are at least 3-4 weeks after you began this dose (to allow full effect to develop), it suggests that a higher dose, e.g., 90 mg (1.5 grains) should be instituted.
Yours in grainless health,
Dr. William Davis
PS: Having the right tools makes every task easier! Do you have an Oral Thermometer?