{"id":23966,"date":"2026-01-24T08:00:49","date_gmt":"2026-01-24T14:00:49","guid":{"rendered":"https:\/\/naturalwomanhood.org\/?p=23966"},"modified":"2026-01-17T15:54:44","modified_gmt":"2026-01-17T21:54:44","slug":"etude-sur-les-thermometres-a-goutte-deau","status":"publish","type":"post","link":"https:\/\/naturalwomanhood.org\/fr\/tempdrop-thermometer-study\/","title":{"rendered":"Une \u00e9tude r\u00e9v\u00e8le que le thermom\u00e8tre de brassard Tempdrop identifie l'ovulation de mani\u00e8re comparable aux tests d'ovulation \u00e0 l'urine"},"content":{"rendered":"\n<p>A <a href=\"https:\/\/www.mdpi.com\/1424-8220\/25\/20\/6327\" target=\"_blank\" rel=\"noreferrer noopener\">2025 research study<\/a> of 194 cycles from 125 women found that the <a href=\"https:\/\/naturalwomanhood.org\/podcast\/nw-podcast-s3-ep5-tempdrop-10-years-later-a-conversation-with-inventor-michael-vardi\/\" target=\"_blank\" rel=\"noreferrer noopener\">Tempdrop<\/a> wearable thermometer, which continuously measures axillary (armpit) temperature while the wearer sleeps, identified ovulation comparably to ClearBlue urinary hormone ovulation tests [1]. Additionally, Tempdrop data now syncs with the Apple Health app.\u00a0<\/p>\n\n\n\n<p>This is promising news both for women seeking to use basal body temperature readings for pregnancy avoidance or achievement, as well as for women seeking additional biodata for personal health and wellness, particularly the millions of women who use the Apple Health app.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-the-science-behind-basal-body-temperature-bbt-for-fertility-tracking\"><span id=\"the-science-behind-basal-body-temperature-bbt-for-fertility-tracking\">The science behind basal body temperature (BBT) for fertility tracking<\/span><\/h2>\n\n\n\n<p>Basal body temperature (BBT, which I previously covered in-depth <a href=\"https:\/\/naturalwomanhood.org\/fertility-awareness-method-basics-basal-body-temperature-bbt\/\" target=\"_blank\" rel=\"noreferrer noopener\">here<\/a>) is your body\u2019s lowest resting temperature in a 24-hour period, which occurs while you\u2019re sleeping. The post-ovulation temperature rise (<a href=\"https:\/\/woombinternational.org\/philosophy\/the-quest-leading-to-the-discovery-of-the-billings-ovulation-method\/#:~:text=Many%20of%20the%20couples%20had,the%20middle%20of%20the%20cycle.\" target=\"_blank\" rel=\"noreferrer noopener\">first documented<\/a> in 1905 by the Dutch gynecologist Theodoor Hendrik van de Velde) is a <a href=\"https:\/\/www.ncbi.nlm.nih.gov\/books\/NBK546686\/\" target=\"_blank\" rel=\"noreferrer noopener\">consequence<\/a> of elevated progesterone levels, which are driven by the <a href=\"https:\/\/naturalwomanhood.org\/fam-basics-what-is-the-corpus-luteum\/\" target=\"_blank\" rel=\"noreferrer noopener\">corpus luteum<\/a> [2]. This is one of <a href=\"https:\/\/naturalwomanhood.org\/menstrual-cycle-prep-for-pregnancy\/\" target=\"_blank\" rel=\"noreferrer noopener\">multiple ways the body prepares<\/a> for a potential pregnancy, and another reminder of how a healthy menstrual cycle, as observed by biomarkers, signals that all is well with the body!<\/p>\n\n\n\n<p>As one Tempdrop <a href=\"https:\/\/pcosnutritionistalyssa.com\/tempdrop-review\/\">review<\/a> mentioned, some women may even see their BBT decrease just slightly about 1-2 days before ovulation, followed by a rise of between 0.4 and 1 degree after ovulation. The BBT should then remain elevated until your period starts, when it returns to pre-ovulatory levels. (In the case of a pregnancy, the BBT remains elevated.)<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-why-you-can-t-track-basal-body-temperature-with-a-standard-thermometer\"><span id=\"why-you-cant-track-basal-body-temperature-with-a-standard-thermometer\">Why you can\u2019t track basal body temperature with a standard thermometer<\/span><\/h3>\n\n\n\n<p>The relatively small temperature shift after ovulation is the reason you need a basal body thermometer, which measures to <em>hundredths<\/em> of a degree, or two decimal places, rather than to <em>tenths<\/em> of a degree, or one decimal place, as standard drugstore oral thermometers do.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-using-bbt-to-achieve-or-avoid-pregnancy\"><span id=\"using-bbt-to-achieve-or-avoid-pregnancy\">Using BBT to achieve or avoid pregnancy<\/span><\/h2>\n\n\n\n<p>For decades, women have utilized BBT monitoring alongside cervical mucus observations (and optional cervical position observations) as part of the symptothermal method of natural family planning, to either achieve or avoid pregnancy. Historically, BBT measurements have offered <em>retrospective<\/em> data, helping confirm that ovulation has already happened and that the <a href=\"https:\/\/naturalwomanhood.org\/just-how-long-is-the-fertile-window-anyway-fertility-awareness-effectiveness-periodic-abstinence-2020\/\" target=\"_blank\" rel=\"noreferrer noopener\">fertile window<\/a> is closing or closed. But that may be changing thanks to Tempdrop\u2019s machine learning algorithm (more on this below).<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-new-study-finds-that-tempdrop-confirms-ovulation-with-comparable-effectiveness-to-urine-ovulation-test-kits\"><span id=\"new-study-finds-that-tempdrop-confirms-ovulation-with-comparable-effectiveness-to-urine-ovulation-test-kits\">New study finds that Tempdrop confirms ovulation with comparable effectiveness to urine ovulation test kits<\/span><\/h2>\n\n\n\n<p>While only oral BBT thermometers <a href=\"https:\/\/naturalwomanhood.org\/basal-body-thermometers\/\" target=\"_blank\" rel=\"noreferrer noopener\">have been clinically studied<\/a> for effectiveness in measuring basal body temperature with the intention of avoiding pregnancy using the symptothermal method, many women have found it a hassle to remember to take their temperature at the same time every morning, before getting out of bed, drinking water, etc. Newcomers to the Femtech scene (like the Tempdrop armband, Oura ring, Ava bracelet, and other wearable thermometers) aim to match the effectiveness of oral thermometers while offering superior user-friendliness.\u00a0\u00a0<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-what-distinguishes-tempdrop-from-other-wearable-thermometers\"><span id=\"what-distinguishes-tempdrop-from-other-wearable-thermometers\">What distinguishes Tempdrop from other wearable thermometers<\/span><\/h3>\n\n\n\n<p>Tempdrop specifically measures underarm (aka armpit or axillary) temperatures because, per the <a href=\"https:\/\/www.mdpi.com\/1424-8220\/25\/20\/6327\" target=\"_blank\" rel=\"noreferrer noopener\">study<\/a>, \u201cit measures the temperature of the skin above the axillary artery. This location is one of the places where skin temperature most closely resembles internal body temperature, as it is near a large blood vessel and if the measurement is taken for more than 12 min, it closely corresponds with the core body temperature.\u201d (Anecdotally, when I worked in the hospital as an ICU nurse, we often checked axillary temperature on our patients who were unable to have their temperature taken orally. In fact, axillary temps were considered more reliable than oral readings.)<\/p>\n\n\n\n<p>In the aforementioned 2025 Tempdrop study, 125 women, aged 18-45 and all living in the United States, tracked BBT overnight with the Tempdrop armband thermometer and also tested urinary luteinizing hormone (LH) and estrogen levels using the ClearBlue monitor. ClearBlue was the clinically validated control against which Tempdrop\u2019s ability to identify ovulation was checked.&nbsp;<\/p>\n\n\n\n<p>In the study, a sophisticated algorithm incorporating BBT readings was used to identify which cycle days were fertile vs non-fertile, as well as the day of ovulation, and they were confirmed by the ClearBlue results. Tempdrop performed well in terms of successfully identifying fertile days as well as non-fertile days, with a minimum of false positive days (days predicted to be fertile but were not) and false negative days (days predicted to be non-fertile but were fertile). In contrast, in a <a href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC6265623\/\" target=\"_blank\" rel=\"noreferrer noopener\">2018 study<\/a> the Ava bracelet wearable thermometer\u2014which is worn on the wrist\u2014was only able to retrospectively (after the fact) confirm ovulation rather than prospectively predict when ovulation would occur [3].\u00a0<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-what-s-next-for-integrating-axillary-temperature-measurement-into-symptothermal-method-practice\"><span id=\"whats-next-for-integrating-axillary-temperature-measurement-into-symptothermal-method-practice\">What\u2019s next for integrating axillary temperature measurement into symptothermal method practice<\/span><\/h3>\n\n\n\n<p>Future research is needed to verify that Tempdrop\u2019s algorithm can accurately<em> anticipate <\/em>fertile vs non-fertile days (based on previous cycle patterns plus machine learning) with comparable efficacy to ClearBlue and other urinary hormone tests. If this is confirmed, Tempdrop use could be formally integrated into symptothermal method protocols for pregnancy achievement or prevention.&nbsp;<\/p>\n\n\n\n<p>Additionally, since the 2025 study was co-authored by Tempdrop founder Michael Vardi as well as the company\u2019s Chief Technology Officer, further independent research by unrelated third parties is necessary.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-what-factors-can-skew-bbt-results\"><span id=\"what-factors-can-skew-bbt-results\">What factors can skew BBT results?<\/span><\/h2>\n\n\n\n<p>It\u2019s important to note that interrupted sleep, shift work (which throws off the body\u2019s circadian rhythm), alcohol consumption, breastfeeding (since hormones can fluctuate often and in unpredictable ways during this time), and illness (particularly illnesses that cause fever) can all skew BBT results\u2014even when taken orally.&nbsp;<\/p>\n\n\n\n<p>Tempdrop claims that its product and algorithm specifically mitigates<em> <\/em>skewed results from <em>sleep-related<\/em> factors like sleep interruption, mouth breathing, restless sleep or sleeping at odd hours as for nightshift workers. (Of note: the\u00a0 <a href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC6265623\/\" target=\"_blank\" rel=\"noreferrer noopener\">2018 study<\/a> of the Ava bracelet measuring wrist temperature throughout the night found that its readings were not skewed by alcohol consumption and other non-sleep lifestyle factors. The Tempdrop website <a href=\"https:\/\/www.tempdrop.com\/a\/blog\/device\/tempdrop-and-bbt-tracking-an-easy-way-to-get-accurate-basal-body-temperature-for-fertility-awareness\" target=\"_blank\" rel=\"noreferrer noopener\">takes issue with the claim<\/a> that skin temperature wearables, like the Ava bracelet, accurately reflect BBT, asserting that BBT must be measured closer to the body\u2019s core.)\u00a0<\/p>\n\n\n\n<p>According to a December 25, 2025 <a href=\"https:\/\/www.tempdrop.com\/a\/blog\/device\/tempdrop-vs-oura-ring\" target=\"_blank\" rel=\"noreferrer noopener\">blog post<\/a> on the Tempdrop website:\u00a0<\/p>\n\n\n\n<p>\u201cWhile you sleep [Tempdrop] collects thousands of data points, from the thermometer and an accelerometer that senses movement. When you sync to the Tempdrop app, a built-in algorithm filters out disturbances (like wake-ups, tossing, turning, and even nighttime [breast]feeds), zeroes in on your most restful moment, and delivers an accurate BBT reading.&nbsp;<\/p>\n\n\n\n<p>That means even if you have irregular sleep, up with a baby, shift schedule, or simply restless nights, Tempdrop still gives you reliable BBT data for fertility awareness, cycle tracking, or trying to conceive.\u201d<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-can-basal-body-temperature-measurement-help-identify-reproductive-health-issues\"><span id=\"can-basal-body-temperature-measurement-help-identify-reproductive-health-issues\">Can basal body temperature measurement help identify reproductive health issues?<\/span><\/h2>\n\n\n\n<p>Women will wonder, how might BBT data, as measured by Tempdrop or other <a href=\"https:\/\/naturalwomanhood.org\/basal-body-thermometers\/\" target=\"_blank\" rel=\"noreferrer noopener\">wearable thermometers that sync with a user\u2019s phone<\/a>, help identify reproductive health issues? Are there patterns of temperature change with PCOS, endometriosis, early menopause, etc.?\u00a0<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-no-temp-rise-no-ovulation\"><span id=\"no-temp-rise-no-ovulation\">No temp rise, no ovulation<\/span><\/h3>\n\n\n\n<p>Plain and simple, no observable temperature rise during a cycle is suggestive of no ovulation, meaning you\u2019ve experienced an <a href=\"https:\/\/naturalwomanhood.org\/what-to-do-about-anovulation-and-anovulatory-cycles\/\" target=\"_blank\" rel=\"noreferrer noopener\">anovulatory cycle<\/a>.\u00a0<\/p>\n\n\n\n<p>Particularly for women trying to conceive, this spells trouble, as there cannot be a baby without ovulation. The culprits behind anovulatory cycles range from hormonal imbalances (such as those that occur with PCOS), to stress, to hormonal contraception (remember, a bleeding episode while taking hormonal birth control is not a true period), to transitional seasons like onset of puberty or postpartum or perimenopause.&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-low-temperatures-may-signal-a-thyroid-issue\"><span id=\"low-temperatures-may-signal-a-thyroid-issue\">Low temperatures may signal a thyroid issue<\/span><\/h3>\n\n\n\n<p>Sometimes the basal body temperature baseline, or usual reading during the part of the cycle where temperature is <em>expected<\/em> to be low, is lower than normal. One potential cause is <a href=\"https:\/\/naturalwomanhood.org\/thyroid-dysfunctions-hypothyroidism-and-your-fertility\/\" target=\"_blank\" rel=\"noreferrer noopener\">hypothyroidism<\/a>. The Tempdrop website suggests that a pre-ovulation BBT consistently below 97.5 F is low, and therefore worth discussing with your doctor, who can screen for other symptoms.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-shorter-luteal-phase-length-may-indicate-a-progesterone-problem\"><span id=\"shorter-luteal-phase-length-may-indicate-a-progesterone-problem\">Shorter luteal phase length may indicate a progesterone problem<\/span><\/h3>\n\n\n\n<p>Cycle trends as identified through the Tempdrop app may help women identify a short or shortening <a href=\"https:\/\/naturalwomanhood.org\/naturalwomanhood-org-fam-basics-luteal-phase\/\" target=\"_blank\" rel=\"noreferrer noopener\">luteal phase<\/a> (remember that the luteal phase is the second half, approximately, of the cycle, the time after ovulation and before menstruation). Estimates of how long a luteal phase should be vary, but <a href=\"https:\/\/naturalwomanhood.org\/naturalwomanhood-org-fam-basics-luteal-phase\/\" target=\"_blank\" rel=\"noreferrer noopener\">generally 9 days or less is considered abnormal<\/a>\u2014with the exception of a return of fertility after childbirth, after which the luteal phase may be just a few days long but should lengthen with each consecutive cycle.\u00a0<\/p>\n\n\n\n<p>A short luteal phase may indicate low progesterone, which may occur downstream of some health issues and upstream of others, and is always worth exploring with a practitioner trained in restorative reproductive medicine.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-other-potential-health-benefits-of-bbt-tracking\"><span id=\"other-potential-health-benefits-of-bbt-tracking\">Other potential health benefits of BBT tracking<\/span><\/h3>\n\n\n\n<p>In a <a href=\"https:\/\/www.youtube.com\/watch?v=LpWKcddC5o8\" target=\"_blank\" rel=\"noreferrer noopener\">video interview<\/a> with Natural Womanhood Editor in Chief, Grace Emily Stark, Tempdrop founder Michael Vardi speculated about other potential health benefits of BBT tracking. Since the app measures sleep quality, Vardi suggested that a woman in her 40s might be clued in that she\u2019s entering perimenopause by noticing that her cycle is beginning to shorten, and her sleep quality is beginning to decline.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-should-fam-users-just-go-straight-to-mira-or-inito\"><span id=\"should-fam-users-just-go-straight-to-mira-or-inito\">Should FAM users just go straight to Mira or Inito?<\/span><\/h2>\n\n\n\n<p>Savvy Natural Womanhood readers may well wonder if, for the price of a wearable thermometer, it would be better to just purchase a Mira or Inito monitor. These quantitative machines provide actual numbers (not just a High or Low or Peak reading as with the ClearBlue monitor) for urinary hormone levels, which Tempdrop readings can only indirectly hint at.&nbsp;<\/p>\n\n\n\n<p>But the specialized information that at-home lab testing provides is reflected in the price tag, ranging from $2-4 per stick for Mira users (depending on how many hormones are being measured), compared to the one-time cost of a wearable thermometer (and a nominal monthly fee for app users who choose the optional Tempdrop Premium experience). (For an in-depth discussion on who might benefit from the additional info provided by the Mira monitor, see Grace Emily Stark\u2019s <a href=\"https:\/\/naturalwomanhood.org\/which-hormone-monitor-is-right-for-your-fertility-goals-bouchard\/\" target=\"_blank\" rel=\"noreferrer noopener\">interview of Dr. Thomas Bouchard, MD<\/a>.) And this ongoing cost is after the roughly $150 spent upfront for the monitor (less with Natural Womanhood\u2019s affiliate code, AFNATURALWOMANHOOD).\u00a0<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-the-bottom-line\"><span id=\"the-bottom-line\">The bottom line<\/span><\/h2>\n\n\n\n<p>The 2025 Tempdrop study indicates that oral thermometers may no longer be the only method for accurately measuring basal body temperature. Future research is needed to confirm the effectiveness of wearable thermometers (as part of the symptothermal method of family planning) for pregnancy achievement or avoidance. Perhaps most hopefully of all, the ease of use of wearables like Tempdrop may help increasingly larger numbers of women become more body literate and improve their reproductive health and overall wellness.&nbsp;<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-references\"><span id=\"references\">References<\/span><\/h4>\n\n\n\n[1] Shpaichler, Y., Thompson, A., Fromager, B., Vardi, M., &amp; Ecochard, R. (2025). Accuracy of an Overnight Axillary-Temperature Sensor for Ovulation Detection: Validation in 194 Cycles. Sensors, 25(20), 6327. <a href=\"https:\/\/doi.org\/10.3390\/s25206327\">https:\/\/doi.org\/10.3390\/s25206327<\/a><\/p>\n\n\n\n[2] Steward K, Raja A. Physiology, Ovulation And Basal Body Temperature. [Updated 2023 Jul 17]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2025 Jan-. Available from: <a href=\"https:\/\/www.ncbi.nlm.nih.gov\/books\/NBK546686\/\">https:\/\/www.ncbi.nlm.nih.gov\/books\/NBK546686\/<\/a><\/p>\n\n\n\n[3] Shilaih M, Goodale BM, Falco L, K\u00fcbler F, De Clerck V, Leeners B. Modern fertility awareness methods: wrist wearables capture the changes in temperature associated with the menstrual cycle. Biosci Rep. 2018 Nov 30;38(6):BSR20171279. doi: 10.1042\/BSR20171279. PMID: 29175999; PMCID: PMC6265623.<\/p>\n","protected":false},"excerpt":{"rendered":"La r\u00e9volution Femtech est en marche","protected":false},"author":85,"featured_media":23968,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","csco_singular_sidebar":"","csco_page_header_type":"","csco_page_load_nextpost":"","csco_post_video_location":[],"csco_post_video_url":"","csco_post_video_bg_start_time":0,"csco_post_video_bg_end_time":0,"footnotes":""},"categories":[5284,5179,1],"tags":[4387,13],"class_list":{"0":"post-23966","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-fertility-apps-and-femtech","8":"category-fertility-awareness-methods","9":"category-uncategorized","10":"tag-fam","11":"tag-fertility-awareness","12":"cs-entry","13":"cs-video-wrap"},"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.2 (Yoast SEO v27.2) - 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