Basal Body Temperature – How Best Is It Use To Detect Ovulation?

Categorized as Getting Pregnant, Preparing For Pregnancy
What is Basal Body Temperature
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Basal body temperature (BBT) can be used to get pregnant faster by defining the most efficient and fertile days. Detecting ovulation using basal body temperature charting (BBT) is relatively simple and inexpensive. A gynecologist or reproductive endocrinologist may suggest charting to detect when ovulation is ongoing or get a better idea of your menstrual cycle models, using basal body temperature thermometers.

In This Article:

Best Basal Body Temperature Thermometers

Charting has many advantages. Charting can help you:

  • Find out when you usually ovulate monthly
  • When is the best time to have sex for pregnancy to occur
  • Record fertility problems, including ovulation or luteal problems (the time between your ovulation and the expected period).
  • Discover the early pregnancy signs … maybe!

Here’s everything you need to know about Basal Body Temperature chart.

What is Basal Body Temperature (BBT)?

Basal body temperature is the temperature at which you are at rest completely. Basal body temperature varies depending on several factors, including hormones.

In ovulation, progesterone causes an increase in temperature. It remains higher during the two-week waiting period. Then, just before the onset of menstruation, the hormone progesterone decreases. This means that your basal body temperature will also drop unless you are pregnant, which in this case, the temperatures remain higher since the progesterone is high.

To find out what your basic body temperature is, measure your temperature in the morning before getting out of bed or moving. You can’t rush to the bathroom first without measuring your basal body temperature, because this causes the temperature to increase slightly, making the chart inaccurate. It is important to measure the temperature correctly. Otherwise, your temperature may not be correct and you may not know or unable to detect when you’re ovulating.

Advantages Of Basal Body Temperature Monitoring

Unlike ovulation equipment, body temperature monitoring is free. It also has no side effects. It is vital to know that fertility is not the only thing that can affect basal body temperature. The following factors can also cause a change in basal body temperature:

  • Stress
  • Sleep disturbance or excessive sleep
  • Business shift
  • Illness
  • Travel and time zone changes
  • Alcohol
  • Gynecological disorders
  • Some types of drugs

Some women may also ovulate without any fluctuation in their basal body temperature.

Why Should I Track Basal Body Temperature?

Tracking BBT with a hint can help make the predictions more accurate. BBT can be used to guess when ovulation is taking place. However, BBT alone cannot predict when ovulation takes place.

BBT is slightly lower in the follicular phase (first part of your menstrual cycle) and increases after ovulation and remains high in the luteal phase (the second part of your menstrual cycle). This temperature increase is caused by an increase in progesterone hormone level, which is released after ovulation has taken place. When progesterone is implanted, the uterus produces a fertilized egg. The temperature change after ovulation is small (TB increases only about 0.3 ° C to 0.6 ° C) and can easily be affected by factors such as disease, alcohol, and change in sleep patterns.

How To Choose A Basal Body Temperature Chart?

The first step is to get a chart to record your basal body temperature. You can also get the fertility awareness software, also called the fertility calendar. There are various calendar options for online fertility and various fertility applications for your phone, many of them are free.

You may also create your own graph. If you create yours, the temperature will be on the vertical axis and put the days of your cycle on the horizontal axis.

Some women may also prefer to use a computer because you can put in a lot of information so as to reduce errors. Some ovulation software can automatically detect when you will have your ovulation. Plotting the temperature chart yourself might make you worry about mistakes. Once you’ve gotten your chart ready so as to record your temperature on it, it is time to start charting your basal body temperature.

How Do I measure Basal Body Temperature?

What is Basal Body Temperature

After choosing the BBT chart, you should buy a thermometer. There are several thermometers specially designed to measure the basal body temperature, you can choose from the table above or read more about them below.

Ideally, you need an accurate one to 1/10th (98.6) degrees when measured in Fahrenheit or 1/100th (37.00) degrees Celsius.

While some have interesting features, the truth is that every good normal thermometer works.

Measuring your basal body temperature is not very difficult. There are some rules to follow though:

  • You should take it at the same time every morning (not earlier or more than 30 minutes every day). For example, if you take it at 6:30 am. You don’t want to take it before 6 am or take it after 7 am on other days.
  • You cannot get up, sit, walk or go to the bathroom before taking a temperature measurement. When you want to sleep at night, place the thermometer to where your hands can easily reach it and when you wake up, put the thermometer in your mouth immediately.
  • You should have slept for at least three or four hours in the same way before measuring your morning temperature. If you wake up all night or get up at night and walk here and there, the results will affect it.
  • You need to use the same thermometer throughout the cycle. (If you buy a new one, use it on the first day of the next cycle).

When should you start the chart?

Ideally, you should start recording on the first day of the cycle and continue taking your BBT every morning throughout the cycle. When you wake up, write down the time you measure your basal body temperature and the time the temperature is taken. After having experience in charting, you can skip the first few days of the period and measure the temperature around the 5th or 7th day. Although it is best to take the temperature throughout the cycle before you know when to ovulate.

Detecting Your Ovulation With Basal Body Temperature

The basal body temperature graph looks for a general pattern, not the temperature frequency here or there. The temperature may rise or fall as the cycle progresses, but a two-stage model should be considered after ovulation. This means that the temperatures before ovulation are lower than average after ovulation.

Basal Body Temperature Chart

Basal Body Temperature chart

After seeing at least three highest average temperatures in a row, you can say that ovulation occurs the day before the first high temperature. If you are also tracking your cervical mucus, you can be more confident that ovulation occurs the day before if you find efficient cervical mucus on the days that cause the temperature to rise.

If you are lucky, you may see a sharp drop in temperature on the day of ovulation. Not all women have the ability to detect this. If you notice a steady drop in temperature before rising from month to month, be sure to have sex that day.

Getting pregnant

The main way to use the BBT chart to get pregnant is to look for a pattern.

Do you tend to ovulate on certain days of the cycle? Use this information to improve sexual intercourse.

For example, if you notice that ovulation is done for three months on days 11, 12, and 15, then you should have sex on days 6 to 16, and pay special attention to days 11 through 15.

You don’t have to have sex on the day of ovulation to get pregnant. If you have sex several times before ovulation during those days, that should be enough for sperm to enter the egg in time. Some couples may also try to have sex on different days of the week before waiting for ovulation. This is a good plan.

How can I track BBT effectively?

Basal Body Temperature 1 Basal body temperature

The process of detecting basal body temperature is simple but requires some effort.

  1. Each morning, measure your temperature before getting out of bed and record it in a chart. You can use a special thermometer or digital oral thermometer designed for basal body temperature. You can read orally, vaginally or rectally. Be sure to use the same procedure every time.
  2. Take temperature every day at the same time or as close as possible. This may mean that you need to set an alarm. You should try to stay within 30 minutes of the average time. You must sleep for at least five hours before measuring.
  3. Enter the thermometer reading on a chart. You can use an application to check for fertility or watch directly on graph paper. Over time, a pattern may begin to emerge. Notice a temperature change of about 0.4 degrees over 48 hours. If this change remains constant for three days or more, it is probably an indication of ovulation.
  4. Have sex on the most fertile days. You will be at maximum fertility about two days before you expect your basal body temperature to rise. Remember that sperm can live in your body for up to five days. You should try to have sex in your productive days.
  5. Be careful if you want to avoid pregnancy. If you’re tracking the basal body temperature to prevent pregnancy, stay away from having sex from the first day of your menstrual cycle to a few days after the basal body temperature rises.

How Does BBT Measurement Help Detect Fertility And Pregnancy?


The normal temperature of a woman without ovulation is between 96 and 99 degrees Fahrenheit, depending on the person. After the release of eggs, BBT increases in almost all women by half a degree. The progesterone hormone which is secreted by ovary after ovulation heats things; It also prepares the endometrium for a possible pregnancy.

The body temperature remains about half a degree higher until it returns to normal shortly before menstruation. (If you become pregnant, the temperature remains higher in the first trimester). If your temperature does not follow this pattern, it may indicate an ovulation problem.

What Are The Best Basal Body Temperature Thermometers?

You don’t really need a special thermometer to measure your basal body temperature, though there are thermometers that can help you read your temperature as easily as possible. We have listed some below for you:

1. Easy @ Home digital basal thermometer

This thermometer has been developed especially for women who want to become pregnant. Features include an alarm clock, backlight for visibility in the dark, a precise measuring range, fire alarm, and end of test alarm. A free charting table is included.

2. Basal Body Thermometer- BBT-113 by iProvèn

The high accuracy of this thermometer is designed for early morning reading. The thermometer keeps track of the last measured temperature, so you can put it on the table whenever you want. This is real body temperature, not a predictable thermometer. This means that it may take longer to customize the survey, but it will be more accurate to read. A free charting table is included for download.

3. iBasal Digital Thermometer

With an alarm clock, 1/100 degree precision, track of the cycle day and a graphical population for the previous 10 readings, this thermometer is a versatile option. It also helps you interpret the values of your thermometer so you can accurately predict fertility.


All you need to measure your basal body temperature is a thermometer and a method to measure your daily readings. Remember to be consistent. Take your temperature every morning at the same time. Accuracy is very important. Review the results after following a full cycle. You can search for models by drawing graphics for several months.

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