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    fertility tracking

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

    • 4.7   (5 Votes)
    Medically Reviewed by Dr. Deepika Tiwari - MBBS on 13 Jul 2018 - Written by Dr. Surveen Ghumman Sindhu - MBBS - Grammatically Approved by Dr. Kavita Jaggi Agrawal - MBBS

    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 Sindhu

    Written by

    Infertility Specialist, Obstetrician

    Dr. Surveen Ghumman Sindhu has immense of experience in the field of Gynaecology and Infertility. She has specialized in Assisted reproductive technologies and IVF from the prestigious Cleveland clinic, USA and is a certified clinical embryologist from Manipal University, the only university in India running a post graduate program in Clinical Embryology. She has further been trained in advanced micromanipulation techniques from the same institute. She has also received a fellowship from the World Association of Laparoscopic Surgeons in minimally invasive surgery. She is currently the Director and Head at IVF and Reproductive medicine, Max Multispeciality Hospitals, Saket, Panchsheel and Patparganj, Delhi.


    Dr. Surveen Ghumman Sindhu is well known for her dedicated and compassionate patient care. She herself felt rewarded when her patients turn up with their children. Through her innovative thinking and cutting-edge treatments protocol she maximise the chance of pregnancy to every patients. Her patients come from all over Dubai.


    Dr. Surveen Ghumman Sindhu  patients are completely confident and well aware of the procedures, setting their expectations right. She is admired for her ethical practice and dutifulness. Her dedicated effort to improve quality of service to her patients is extremely appreciated and exhibited in her actions. She is the personal favorite of her patients not just for the skilled doctor she is, but also for her amazing personality. Her commitment to excellence is focused on the needs of each woman throughout all stages of life. Dr. Surveen Ghumman Sindhu has a vast experience of 27 year of working in tertiary care hospitals and has been a faculty as an undergraduate and postgraduate teacher in renowned medical colleges of Delhi over the last 27 years.


    Dr. Surveen Ghumman Sindhu works hard as a Gynecologist and believes in providing help to as many patients as she could. She likes to attend various conferences held at different cities so she could impart her knowledge about gynaecology. She believes that, by attending workshops conducted by various institutions, she could enhance her understanding of a patient's mind-set which would eventually help her treat the patient better. She is  known for her humble nature and tender care of patients. The efficiency, dedication, precision and compassion offered at the clinic ensure that the patient's well-being, comfort and needs are kept of top priority.


    Dr. Surveen Ghumman Sindhu passionate about delivering the highest standard of healthcare. Dr. Surveen Ghumman with her patients to gain detailed understanding of their condition and offers and considerate insights that help in creating an affordable and effective treatment plan for patients. With the cutting-edge medicine, state-of-the-art infrastructure and personalized nursing care, she make sure that the patients are her priority. 


    Dr. Surveen Ghumman Sindhu is a verified doctor and is registered under 9138 of the Delhi Medical Council, 1986. She incorporates better methods to further improve the quality life of patients who have had a fertility Issues. With her innovative thinking and cutting-edge treatment protocols, she maximizes the chances of pregnancy and minimizes the chances of complications. Don’t wait in a queue, book an instant appointment online with Dr. Surveen Ghumman Sindhu on


    • 6 do's and don'ts while measuring with bbt chart - precautions while using bbt chart  BBT chart, Elawoman - 2017
    • Appearance of cervical mucus - know about different types of cervical mucus  cervical mucus, Elawoman - 2017
    • Most noticeable signs of infertility in women - in menstrual cycle and ovulation  fertility signs, Elawoman - 2017
    • Know all about polycystic ovary syndrome (pcos) - pcos weight loss, pcos treatment  PCOS, Elawoman - 2017



    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


    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


    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


    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


    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

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