A basal thermometer is a sensitive device designed for reading the small changes in temperature that occur over the course of a woman’s menstrual cycle. Basal thermometer comes in both mercury based glass thermometer as well as digital. Digital thermometer is better option as it reads the temperature more rapidly than mercury thermometers, often within 30 to 60 seconds.
What is Basal Body Temperature (BBT)
A basal body temperature (BBT) is the normal body temperature of a person at rest. It is the body temperature measured under the conditions, which is not influenced by food, drink or any activities. For optimum accuracy, basal temperature should be taken at the same time every morning upon waking. Women can track their BBT to find out when they are ovulating. With this time line, By taking basal temperature daily and charting it, a woman can learn when she is most or least likely to become pregnant.
Charting Your Basal Temperature
Before ovulation, a woman’s BBT averages between 36.1°C (97°F) and 36.4°C (97.5°F). After ovulation, it rises to 36.4°C (97.5°F) to 37°C (98.6°F). By charting your basal temperature daily, you can see a pattern and notice the changes that occur in every ovulation cycle. You can record your daily basal temperature on the enclosed charts. Take your temperature at the same time every day before getting out of bed. Keeping a charted record for at least three months will usually provide the information you need to determine your approximate day of ovulation during a regular menstrual cycle.
How to Take Accurate Basal Body Temperature
To obtain an accurate basal temperature, you must take your temperature when you first awake in the morning. For best results, this waking temperature should be taken at the same time each morning. Since any activity may tend to raise your temperature, do not get out of bed until you have taken your basal temperature. Postpone going to the bathroom, eating, smoking or drinking until after taking your basal temperature.
Places of Measurement
Since temperatures taken at different sites can vary, it is important to select one method and then take your temperature the same way everyday. You must use either the oral, vaginal or rectal method. Using more than one method will give inaccurate results.
- Oral measurement is very comfortable but on account of differences of temperature in the individual parts under the tongue (lower in the front, higher in the back) it needs more precision and longer time, with closed mouth. It is recommended mainly women and girls who have reasons to avoid vaginal or rectal measurement.
- Vaginal measurement On account of natural bacterial flora killing micro-organisms the thermometer doesn’t need any special hygienic treatment apart washing it in a warm water. Only fungal infections of the vagina may be a contraindication for this measurement.
- Rectal measurement is the least comfortable but the most stable if we take the result into consideration. It needs to maintain hygiene and conduct disinfection of the thermometer as well as oiling the thermometer before taking measure.
Best Basal Digital Thermometers 2018
Below are some of the best basal digital thermometers which are accurate and reliable.
4.1 out of 5 stars
- Accurately measures your basal body temperature and detects the temperature shift that follows ovulation
- Interprets your temperature data for you to provide a fertility prediction!
- Reminder alarm ensures consistent timing of readings and charting accuracy
- Measures BBT to 1/100th of a degree (e.g. 97.41 F)
- Automatically displays your cycle day and a graph of your previous 10 readings
With the ibasal, BBT charting just got smarter and easier. The ibasal is a computerized digital basal thermometer that helps you maximize your chances of conceiving by accurately measuring your BBT and interpreting this data to produce a fertility prediction in advance of ovulation. That’s right: no more trying to interpret your data – iBasal does it for you! The ibasal is easy to use. To begin, simply set the time and date in the ibasal and set the alarm. The alarm will sound the next morning and each morning throughout your cycle, reminding you to take your BBT and ensuring reading consistency from one day to the next. The ibasal will measure and display your temperature to the 1/100 th of a degree (e.g. 97.41 F), show your cycle day, and populate a graph of your previous 10 readings on the LCD screen….Read More
4.1 out of 5 stars
- High Accuracy ±0.05℃
- 60 reading memory records
- Large LCD monitor
- Automatic switch-off
This is another nice basal thermometer that has great features including the ability to recall your last 60 temperatures. The backlight and memory of temperatures is very helpful when taking temperature in the dark. …..Read More
4.3 out of 5 stars
- Accurately measures your basal body temperature
- Fast reading
- Reminder alarm
- Measures BBT to 1/100th of a degree
This basal thermometer gives consistent temperature reading accurately and much quicker compare to other thermometers. It has back light which is great in dark early hours. It also comes with an alarm that can be set at either low or high volume. Only draw back of this thermometer is that it’s in Japanese language…Read More
3.5 out of 5 stars
- Accu-Beep(TM) feature ensures fast, accurate readings
- Check basal temperature to understand your fertility cycle
- Auto memory shows last temperature taken
- Mercury free
- Oral or rectal use
- Clinically proven to match glass thermometer accuracy
- Continuous beep confirms you are using the thermometer correctly
- Signals when complete
- As fast as one-minute temperature read-out
- Automatic shut-off
- Battery and storage case included
The Nexcare™ Basal Digital Thermometer measures temperature to the 10th degree and offers a more accurate reading of basal temperature than glass or mercury thermometers. The Accu-Beep™ feature of Nexcare Basal Digital Thermometers ensures fast, accurate readings and even confirms with a beep that you are using the thermometer correctly. It even has an auto memory feature that helps you keep track by showing the last temperature taken. Nexcare Basal Digital Thermometer can be used orally or rectally. A battery and storage case are included…..Read More
3.7 out of 5 stars
- Pinpoint accuracy for fertility charting – lab certified!
- Comes with a magnifying case for easy interpretation!
- Non-mercury – environment and family safe!
- Includes comprehensive ovulation charts and instructions!
It’s an ultra-accurate, non-toxic alternative to mercury thermometers that is designed specifically for bbt charting. Containing not a single drop of mercury, the Fairhaven Health Non-Mercury Glass Basal Thermometer is certified accurate – and even comes with a no-break carrying case that acts as a magnifying lens so you can read your basal temperature – and fertility chart – with precision…..Read More
4.3 out of 5 stars
- High accuracy: +/- 0.01 °C – Precise to 2 decimal places
- Ability to switch between Celsius and Fahrenheit
- Easy to read Liquid Crystal display, Backlight for easy reading
- Memory Function, Rubbery flexible tip, Discreet beep when peak temperature is reached
- FREE BBT chart included, to chart your Basal Body Temperature & predict ovulation
3.3 out of 5 stars
- 60-second readout
- Readings are within 1/10th of a degree
- Includes 5 probe covers
60-second readout. a tool for natural family planning or to better understand the fertility cycle. provides readings within 1/10th of a degree of accuracy. readings are displayed to a 100th of a degree for further precision. 12-month supply of ovulation charts. storage case. 5 probe covers. replaceable lr41 long-life battery. °f. peak temperature tone. memory recall of last reading. water resistant. 1-year limited warranty….Read More