fertility tracking

8 Types of BBT Thermal Shift - Know Thermal Shifts in details

  • 4.7 (5 Votes)
  • 39919 views

BBT Thermal Shifts are crucial in determining the results of basal body temperature chart and finding out the best day to conceive. Different types of this ovulation calculator include Biphasic Curve, Slow Rise Pattern, Fall then Rise pattern, Zig zag pattern, Ovulation Dip, and No Thermal Shift.

In an ideal world, all women would have straightforward and easy-to-read BBT charts that show their ovulation patterns very clearly, so everyone could conveniently know exactly when they are fertile. Fertility calculators would have been a thing of the bygone. Unfortunately, this is not the case. Each woman is different and so is her BBT chart. In this section, we’ll go over the most common types of BBT charting patterns, a.k.a. thermal shifts.

1. Biphasic Curve or Standard Thermal Shift Pattern:

While there’s no such thing as an “abnormal” chart, some charts do look more typical than others. The most common type is the biphasic curve or standard thermal shift pattern. In the biphasic curve, there are 2 phases: a clear set of low temperatures, followed by a distinct shift of at least two-tenths (0.2) degrees Fahrenheit, then another range of higher temperatures that last until the end of the cycle. This type of chart is the easiest to read and draw a cover line for. You can begin to get a sense of whether or not your chart is biphasic once your temperatures have stayed elevated for at least 3 to 4 days after ovulation, but it’s best to wait until the end of your menstrual cycle to determine.

Though most women will experience the same kind of patterns within their own cycles, it’s also normal to occasionally see some variation. The biphasic curve is the most common, but there are other types of patterns to keep in mind as well.

2. Slow Rise Pattern:

Another BBT chart type is the monophasic or slow rise pattern. On monophasic charts, there’s no distinct jump in temperature but instead, a gradual rise.

Ovulation, Fertility Calculator, BBT Chart

For example, temperatures may increase slightly by one-tenth (0.1) of a degree Fahrenheit each day. Note that the Fertility Awareness Method rules for drawing cover lines don’t work for monophasic charts.

3. Triphasic Curve or Stair-Step Rise Pattern:

The triphasic curve or stair-step rise pattern is a chart in which the temperatures rise twice after ovulation, creating 3 phases on the chart. The initial rise may last for a few days, then the temperatures rise again for the second time, typically 7 to 10 days after ovulation. 

Some women wonder if the second rise indicates pregnancy, but there’s no scientific evidence that supports that triphasic curves reliably mean pregnancy. The best way to figure out if you’re pregnant is to watch for elevated BBT beyond 14 to 15 days after ovulation without a period.

4. Fall-Then-Rise Pattern:

In the fall-then-rise pattern, a distinct rise is observed, temperatures drop or fall slightly again, and then immediately rise again for the rest of the cycle. Keep in mind that there are some circumstances where it might be tough to distinguish fall-then-rise pattern from a chart with a random, outlier temperature. In these cases, use your other non-temperature tracking methods (cervical mucus or cervical position) or luteal phase length to determine whether or not the chart is demonstrating a fall-then-rise pattern.

5. Zig-Zag Pattern:

As the name implies, temperatures may rise in a pattern that resembles a "zig-zag." In this pattern, the temperatures may rise, fall slightly, then rise again for a few days. 

6. Ovulation Dip (Dip Before Rise):

Some women observe a slight temperature dip right before ovulation and its subsequent temperature rise. This is known as an “ovulation dip.” For those who are lucky and experience this dip consistently throughout their cycles, it can serve as a (very) helpful indication that ovulation is coming soon. Keep in mind that just because you experience a dip, it doesn’t necessarily mean that ovulation is coming. In other words, it’s possible that you can experience a dip but it’s actually not followed by a sustained rise. An individual dip can’t tell you anything about ovulation or your fertility so make sure that you always confirm that ovulation occurred by looking for a subsequent temperature rise.

7. Ambiguous Thermal Shift:

Unfortunately, not all thermal shifts are clear or obvious. With this kind of pattern, it can be tough to pinpoint when exactly ovulation occurred. Shifts can be ambiguous for a number of reasons: temperatures rise slowly; some dips occur, or data could be missing or conflicting.

BBt Chart, Fertility, Ovulation

In these cases, it’s helpful to also track other fertility signs, such as cervical mucus or cervical position. Trust us, we understand how frustrating this can be, but the best thing to do is assume the latest possible date for ovulation. Also, Ela will be depending on other factors to help you out as well. 

8. No Thermal Shift:

Sometimes, women record BBT charts with no clear patterns of high and low temperatures even when they are doing all the “DOs” in our “DOs and DON’Ts of BBT Charting.” If this is you, then there are few things that could be going on.

One case being that there is a small number of women whose bodies don’t respond to progesterone, despite having actually ovulated. If in fact, this situation does apply to you, then you always have the option to track your fertility by charting cervical mucus and/or cervical position, too.

It’s also possible to have an anovulatory cycle, which wouldn’t have a thermal shift since there’s no heat-producing progesterone released from the corpus luteum (because you didn’t ovulate). Anovulatory cycles can be temporarily onset by factors, like illness, stress, or a follicular ovarian cyst. However, multiple anovulatory cycles could be indicative of medical conditions such as Polycystic Ovarian Syndrome (PCOS). If you suspect that this may be the case, please reach out to your doctor to discuss it further.

Lastly, menopause could also be a possibility. As women approach menopause, they stop ovulating as much as they used to.

Note: When it comes to BBT charts, there can be all sorts of pattern variation. The patterns we described above might be a little bit tricky to read at first, but once you get familiar, they’ll become way easier to interpret. 

Dr. Surveen Ghumman

About The Author

Infertility Specialist, Obstetrician Dr. Surveen Ghumman
Delhi

Dr. Surveen Ghumman is an infertility specialist and gynecologist specializing in IVF, Reproductive Endocrinology, Recurrent failures of implantation, Embryology, Fertility preservation and Surrogacy. Dr. Surveen has completed MBBS from Christian Medical College, Ludhiana in 1986 and MD in Obstetrics and Gynecology from Government Medical College, Amritsar in 1991. She has also pursued certificate courses in ART and Clinical Embryology from Manipal University and fellowships in Minimal Access Surgeries. She has also pursued Micromanipulation in ART in the year 2011. Dr. Surveen is practicing at The Fertility Clinic IVF Solutions and Max Super Specialty Hospital. For more information, visit elawoman.com

5 Comments

user_img

Kakalita Pradhan

I usually have fever nowadays because of my typhoid. Should I take BBT reading or not? Can I have accurate BBT results during my fever?

Oct. 7, 2018, 5:22 p.m. 4.5

user_img

Shalini Dubey

Thanks for explaining these points. I could now analyze my BBT chart much easily.

Sept. 11, 2018, 9:20 p.m. 5.0

user_img

Ashi Thakur

Oh! There is so much science associated with BBT. I did not know about this before.

Aug. 21, 2018, 9:46 a.m. 5.0

user_img

Radhika Pal

It's quite easy to track ovulation with a fertility calculator too. Sometimes we need to know the average length of menstrual cycle so that we can get to know our ovulation.

Sept. 19, 2017, 5:20 p.m. 4.5

user_img

Punita Arora

That's so true. Thermal shift in the body is indicative of ovulation exactly what we women run after. I was advised by my doctor to do BBT charting along with using ovulation predictor kits.

Sept. 19, 2017, 5:12 p.m. 4.5

View all comments

Leave a Comment

Rating

Disclaimer

The information displayed on this webpage covers general information on several medical conditions, fertility treatments, IVF ICSI, surrogacy procedure, home remedies, and their respective treatments. The exclusive purpose of the displayed information is for the sake of general understanding and it has been collected from open sources which heavily rely on research and laboratory tests. However, the information shared here should not be considered as a medical advice or an alternative to consultation with a registered medical practitioner or licensed healthcare professional.

It is not advised to self-diagnose or treat any medical condition or disease following the information given in this article. We insist you to consult a registered practitioner and never try to replace their advice or discontinue treatment in between by relying solely on the information obtained. External links to different websites as well as videos given on the website serve the purpose of sharing knowledge only. Ela being an Independent Medical Information platform is neither responsible nor guarantees the authenticity, reliability, and accuracy of these videos and websites in any way. We do not intend the information displayed here to be used for a medical emergency, if you seek medical attention for yourself (or any other person with whom you want to share the information with), we advise you to directly get in touch with the hospital or the doctor.

More From Author

Fertility Tracking
Basal Body Temperature - How to measure BBT? Should I chart BBT?

Basal Body Temperature - How to measure BBT? Should I chart BBT?

posted on 14 Jan 2017 4.7/ 5

Basal Body Temperature is one of the best ways to keep a track of ovulation which helps in conceiving a baby or avoiding pregnancy. BBT Thermometer is the best solutio...

Read More

Fertility Tracking
How to Detect Ovulation Instantly? - 5 Smart Ways to Do it successfully

How to Detect Ovulation Instantly? - 5 Smart Ways to Do it successfully

posted on 14 Jan 2017 4.7/ 5

Ovulation can be detected with the help of 5 smart ways. This includes waiting for one-sided cramp and mid cycle bleeding, using ovulation predictor kit as well as BBT...

Read More

Fertility Tracking
How to determine Pre and Post Ovulation with BBT Chart? Check for the signs of ovulation

How to determine Pre and Post Ovulation with BBT Chart? Check for the signs of ovulation

posted on 14 Jan 2017 4.7/ 5

BBT Chart helps in finding out Pre and Post Ovulation period in women. BBT charting proves to be useful for women who are planning to get pregnant. If you are searchin...

Read More

Related Article view all

Fertility Tracking
Basal Body Temperature - How to measure BBT? Should I chart BBT?

Basal Body Temperature is one of the best ways to keep a track of ovulation which helps in conceiving a baby or avoiding pregnancy. BBT Thermometer is the best solution to measure and keep a check on the basal body temperature. You need to keep a BBT chart which will be helpful in saving money from extensive pregnancy tests.

Read More

Fertility Tracking
6 Do's and Don'ts while measuring with BBT Chart - Precautions while using BBT chart

BBT chart is highly used to record basal body temperature. BBT chart includes starting the charting steps from the day one of the cycle, measure BBT at the same time every morning and be consistent with the method you use. BBT charting don'ts include taking less stress, avoiding alcohol, and avoiding use of normal thermometer.

Read More

Fertility Tracking
Fertile Symptoms - How to track and see them? 4 effective ways to do it

Fertile symptoms can be found out with the help of 4 effective ways. This includes monitoring cervical health, use of ovulation predictor kits, and tracking secondary ovulation symptoms. Women need to make sure that they track the symptoms with proper records to avoid any kind of confusion in future.

Read More

Trending Articles

surrogacy
surrogacy

5 Best Surrogacy Doctors in India

posted on 14 Jan 2017 4.5 / 5(1 Votes)

Find the list of best surrogacy doctors in India who offers the best treatment with the highest success rate. The list has been categorized on the basis of doctors fame, experience, reviews, ratings, and cost. Dr. Mohit Saraogi from Saraogi Hospitals and IRIS IVF Centre and Dr. Kaberi Banerjee from Advanced Fertility Centre top the list of the best surrogacy doctors in India.

Read More

IVF
ivf

Best IVF Doctors in India with Highest Success Rates

posted on 14 Jan 2017 4.7 / 5(3 Votes)

Find here the list of best IVF doctors in India on the basis of Ratings, Success Rate, Services offered, IVF cost packages and available Facilities. Dr. Nisha Bhatnagar, Dr. Kaberi Banerjee and Dr. Anjali A Deval top the list of such IVF doctors in India due to their unique pricing system, popularity and high success rate.

Read More

surrogacy
surrogacy

Top Surrogacy Centres in India with Highest Success Rates

posted on 14 Jan 2017 4.8 / 5(2 Votes)

In this article we bring you the best Surrogacy Centres and clinics in India with Review Ratings, Cost Estimates, and Surrogacy Success Rate to help you make the best choice. Aveya IVF and Surrogacy Centre and Advanced Fertility and Surrogacy Centre tops the list of such surrogacy centres in India due to their low treatment costs, popularity and high success rates.

Read More