Fact Check: Are VQ scans safe in pregnancy?

Published May 7, 2025
VERDICT
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# Are VQ Scans Safe in Pregnancy? ## Introduction The safety of ventilation-perfusion (VQ) scans during pregnancy has become a topic of interest, par...

Are VQ Scans Safe in Pregnancy?

Introduction

The safety of ventilation-perfusion (VQ) scans during pregnancy has become a topic of interest, particularly in the context of diagnosing pulmonary embolism (PE). The claim in question is whether VQ scans are safe for pregnant women and their fetuses. This claim is significant as it pertains to the health and safety of both the mother and the developing fetus during a critical time.

What We Know

  1. Radiation Exposure: VQ scans expose the fetus to approximately 1-2 mSv of radiation, which is comparable to the radiation exposure from computed tomography pulmonary angiography (CTPA) scans 28. According to the American College of Obstetricians and Gynecologists (ACOG), the radiation doses from various imaging modalities, including VQ scans, are generally considered low 5.

  2. Comparative Safety: A study published in the Journal of the American Medical Association (JAMA) assessed the safety of VQ scans by examining adverse pregnancy outcomes such as preterm labor and congenital anomalies. The findings suggested that VQ scans do not significantly increase the risk of these outcomes compared to other imaging methods 6.

  3. Guidelines and Recommendations: Various medical guidelines, including those from ACOG, recommend that imaging studies, including VQ scans, should be performed when the benefits outweigh the risks, particularly in cases of suspected PE 54.

  4. Alternative Imaging Options: VQ scans are often considered a safer alternative to CTPA in pregnant patients, especially for those who may have contraindications to contrast agents used in CT scans 79.

  5. Indeterminate Results: Concerns have been raised regarding the accuracy of VQ scans, as a significant percentage of scans can yield indeterminate results. However, in pregnant patients, the rate of indeterminate results is reportedly lower than in the general population 9.

Analysis

The evidence surrounding the safety of VQ scans during pregnancy is derived from a mixture of clinical studies, expert guidelines, and patient information resources.

  • Source Credibility: The studies cited, particularly those from peer-reviewed journals like JAMA 6 and PMC articles 12, provide a level of credibility due to their scientific rigor and the peer-review process. However, it is important to note the potential for publication bias, as studies with positive findings may be more likely to be published.

  • Potential Conflicts of Interest: Some sources, such as patient information documents from hospitals 37, may have an inherent bias towards reassuring patients about the safety of procedures they offer. This could affect the objectivity of the information presented.

  • Methodological Concerns: While the studies generally report low risks associated with VQ scans, the methodologies used to assess safety—such as the evaluation of adverse outcomes—may not account for all variables, including the timing of the scan in relation to pregnancy stages or the health status of the mother.

  • Expert Opinions: Articles from medical professionals and organizations 54 provide guidelines based on consensus and expert opinion, which can be valuable but also reflect the prevailing attitudes and practices that may not always align with emerging evidence.

  • Lack of Comprehensive Data: There is a need for more extensive longitudinal studies that track the long-term effects of VQ scans on both mothers and children. Current data primarily focus on immediate outcomes, which may not capture delayed effects.

Conclusion

Verdict: True

The evidence suggests that VQ scans are generally safe for use during pregnancy, particularly when the benefits of diagnosing conditions like pulmonary embolism outweigh the associated risks. Key evidence supporting this conclusion includes the relatively low radiation exposure to the fetus, findings from peer-reviewed studies indicating no significant increase in adverse pregnancy outcomes, and guidelines from reputable medical organizations recommending their use under specific circumstances.

However, it is essential to acknowledge the limitations of the available evidence. While current studies indicate safety, they often focus on immediate outcomes and may not fully account for long-term effects or variations in individual health circumstances. Additionally, the potential for publication bias and conflicts of interest in some sources underscores the need for cautious interpretation of the findings.

Readers are encouraged to critically evaluate the information presented and consult healthcare professionals when considering imaging options during pregnancy. The decision to proceed with a VQ scan should be made collaboratively, weighing the potential benefits against the risks in the context of each individual case.

Sources

  1. Computed tomography pulmonary angiography versus ... PMC6312023
  2. V/Q scans and computerized tomography pulmonary ... PMC4214031
  3. Nuclear medicine lung (VQ) scans Information for patients during pregnancy Yale Medicine
  4. CT and MR Pregnancy Guidelines UCSF Radiology
  5. Guidelines for Diagnostic Imaging During Pregnancy and Lactation ACOG
  6. Suspected Pulmonary Embolism in Pregnancy - JAMA Network JAMA Network
  7. Nuclear Medicine Lung (V/Q) Scan in Pregnancy - York and Scarborough York Hospitals
  8. Vq Scan Safety During Pregnancy: Any Risks? | ShunChild ShunChild
  9. V/Q or CTPA in suspected PE in pregnancy Resus
  10. Investigation of Suspected Pulmonary Embolism (PE) in Pregnancy - Risks Hey NHS

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Fact Check: Autistic Non-Verbal Episodes in Marriage: Why Words Vanish Sometimes and What to Do About It Neurodiverse Couples Tuesday, august 12, 2025. Here’s the scene: You’re in the middle of a conversation with your spouse. Maybe the topic is small (“Did you pay the water bill?”) or monumental (“Are we happy?”). And then—without warning—your autistic partner’s voice disappears. No yelling, no slammed doors. Just… gone. You’re left holding the conversational steering wheel while they’ve quietly climbed into the trunk. If you’ve never lived with high-functioning autism, this can be tragically misconstrued as stonewalling or contempt. It isn’t. It’s just neurology pulling the emergency brake. Why This Happens: The Science Without the Lab Coat Smell For autistic adults, losing speech under stress is often a shutdown—a form of nervous system overload that knocks language production offline. Think of it like your phone freezing: all the apps are still there, but none of them open when you tap. Research calls this autistic burnout when it happens in a longer, chronic cycle—linked to masking (Hull et al., 2017; Raymaker et al., 2020). Masking is the art of “performing normal” so well that non-autistic people think you’re fine. The issue is that it eats through your energy reserves like a car idling in traffic with the A/C on full blast (Mantzalas et al., 2022). Eventually, one hard conversation can tip you from functional to frozen. And here’s where couples therapy meets neuroscience: physiological flooding—the body’s fight/flight/freeze switch—is a known relationship killer (Malik et al., 2019; Gottman Institute, 2024). In other words, for some autistic partners, flooding may tend to show up sooner, last longer, and is more likely to pull the plug on speech entirely. The Danger Loop in Marriage Autistic partner goes non-verbal — brain says “nope.” Non-autistic partner reads it as avoidance — brain says “attack.” Pressure increases — “Just say something.” Shutdown deepens — and now you’ve both lost. Do that a few hundred times and you’ll start conflating a physiological response into a moral failing. That’s the real marriage-killer. The Protocol: Three Phases, Zero Guesswork This is where we get practical. You can’t “love away” a temporary shutdown, but you can stop it from turning into World War III. Before: Build the Net Name the state. Agree on a phrase or signal ( I call this a couple code)—such as “words offline,” “shutdown,” a hand over the heart. The point is to make the invisible visible. The Shutdown Card. A literal card that says: I can’t speak right now. Please lower lights, reduce sound, give me X minutes. I promise I will circle back. The Pause Rule. Require a minimum of 20 minutes before resuming any tough talk. Autistic partner may need 90+. Agree ahead of time. Downgrade Kit. the usual gear; earplugs, soft light, weighted blanket, fidget, a quiet room. You know, human decency in object form. Reduce Daily Load. Avoid heavy talks right after work or big social events. Chronic overload makes a nervous shutdown more probable. During: Do Less, Better Autistic Partner: Give the signal. Exit stimulation. Switch channels if possible (text, notes app, yes/no cards). Send a short pre-written message: “Safe, can’t talk, back at 8:15.” Non-Autistic Partner: Acknowledge once—“Got it, I’m with you.” Hold the pause boundary. Lower stimuli. Go regulate your own nervous system—walk, journal, pet the dog. Don’t rehearse comebacks. Both: Avoid sarcasm, interrogation, ultimatums. Nothing lengthens a shutdown like moral outrage. After: Close the Loop Check in: “Are you ready to talk, or should we start in text?” Debrief: Identify triggers and what helped. Solve the actual problem. 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F., et al. (2023). The lived experience of meltdowns for autistic adults. Autism, 27(7), 1787–1799. https://doi.org/10.1177/13623613221145783 Malik, J., et al. (2019). Emotional flooding in response to negative affect in romantic relationships. Journal of Couple & Relationship Therapy, 18(4), 327–349. https://doi.org/10.1080/15332691.2019.1641188 Gottman Institute. (2024, March 4). Making sure emotional flooding doesn’t capsize your relationship. Retrieved from https://www.gottman.com/blog/making-sure-emotional-flooding-doesnt-capsize-your-relationship/

Detailed fact-check analysis of: Autistic Non-Verbal Episodes in Marriage: Why Words Vanish Sometimes and What to Do About It Neurodiverse Couples Tuesday, august 12, 2025. Here’s the scene: You’re in the middle of a conversation with your spouse. Maybe the topic is small (“Did you pay the water bill?”) or monumental (“Are we happy?”). And then—without warning—your autistic partner’s voice disappears. No yelling, no slammed doors. Just… gone. You’re left holding the conversational steering wheel while they’ve quietly climbed into the trunk. If you’ve never lived with high-functioning autism, this can be tragically misconstrued as stonewalling or contempt. It isn’t. It’s just neurology pulling the emergency brake. Why This Happens: The Science Without the Lab Coat Smell For autistic adults, losing speech under stress is often a shutdown—a form of nervous system overload that knocks language production offline. Think of it like your phone freezing: all the apps are still there, but none of them open when you tap. Research calls this autistic burnout when it happens in a longer, chronic cycle—linked to masking (Hull et al., 2017; Raymaker et al., 2020). Masking is the art of “performing normal” so well that non-autistic people think you’re fine. The issue is that it eats through your energy reserves like a car idling in traffic with the A/C on full blast (Mantzalas et al., 2022). Eventually, one hard conversation can tip you from functional to frozen. And here’s where couples therapy meets neuroscience: physiological flooding—the body’s fight/flight/freeze switch—is a known relationship killer (Malik et al., 2019; Gottman Institute, 2024). In other words, for some autistic partners, flooding may tend to show up sooner, last longer, and is more likely to pull the plug on speech entirely. The Danger Loop in Marriage Autistic partner goes non-verbal — brain says “nope.” Non-autistic partner reads it as avoidance — brain says “attack.” Pressure increases — “Just say something.” Shutdown deepens — and now you’ve both lost. Do that a few hundred times and you’ll start conflating a physiological response into a moral failing. That’s the real marriage-killer. The Protocol: Three Phases, Zero Guesswork This is where we get practical. You can’t “love away” a temporary shutdown, but you can stop it from turning into World War III. Before: Build the Net Name the state. Agree on a phrase or signal ( I call this a couple code)—such as “words offline,” “shutdown,” a hand over the heart. The point is to make the invisible visible. The Shutdown Card. A literal card that says: I can’t speak right now. Please lower lights, reduce sound, give me X minutes. I promise I will circle back. The Pause Rule. Require a minimum of 20 minutes before resuming any tough talk. Autistic partner may need 90+. Agree ahead of time. Downgrade Kit. the usual gear; earplugs, soft light, weighted blanket, fidget, a quiet room. You know, human decency in object form. Reduce Daily Load. Avoid heavy talks right after work or big social events. Chronic overload makes a nervous shutdown more probable. During: Do Less, Better Autistic Partner: Give the signal. Exit stimulation. Switch channels if possible (text, notes app, yes/no cards). Send a short pre-written message: “Safe, can’t talk, back at 8:15.” Non-Autistic Partner: Acknowledge once—“Got it, I’m with you.” Hold the pause boundary. Lower stimuli. Go regulate your own nervous system—walk, journal, pet the dog. Don’t rehearse comebacks. Both: Avoid sarcasm, interrogation, ultimatums. Nothing lengthens a shutdown like moral outrage. After: Close the Loop Check in: “Are you ready to talk, or should we start in text?” Debrief: Identify triggers and what helped. Solve the actual problem. No conflict gets left to rot in the corner. Spot burnout early. If shutdowns start clustering, it’s time to reduce demands, not double them. How This Isn’t Stonewalling Stonewalling is a choice. Shutdown is a lockout. Stonewalling says, “I won’t talk to you.” Shutdown says, “I can’t talk to you yet, but I will.” The key difference? Repair intention. A shutdown protocol builds that right into the process. The Ten-Minute At-Home Drill Co-create your signal and card. Agree on a pause window. Pack the downgrade kit. Rehearse the exchange (“Got it, I’m with you.”). Check in weekly to tweak the system. Remember, you’re not aiming for zero shutdowns. You’re aiming for shorter, kinder, safer ones. Why This Works Because it matches lived autistic experience (Raymaker et al., 2020; Lewis et al., 2023). Because it honors nervous system limits instead of punishing them (Malik et al., 2019). Because it lets both partners keep their dignity and still solve the problem. In other words: you’re building a marriage that can survive the occasional moments when the words are gone for the time being. Be Well, Stay Kind, and Godspeed. REFERENCES: Hull, L., Mandy, W., Lai, M.-C., Baron-Cohen, S., Allison, C., Smith, P., & Petrides, K. V. (2017). “Putting on my best normal”: Social camouflaging in adults with autism spectrum conditions. Autism, 21(5), 611–622. https://doi.org/10.1177/1362361316671012 Raymaker, D. M., Teo, A. R., Steckler, N. A., Lentz, B., Scharer, M., Delos Santos, A., … & Nicolaidis, C. (2020). “Having all of your internal resources exhausted beyond measure and being left with no clean-up crew”: Defining autistic burnout. Autism in Adulthood, 2(2), 132–143. https://doi.org/10.1089/aut.2019.0079 Mantzalas, J., Richdale, A. L., Adikari, A., Lowe, J., & Dissanayake, C. (2022). What Is Autistic Burnout? A thematic analysis of posts on two online platforms. Autism in Adulthood, 4(1), 52–65. https://doi.org/10.1089/aut.2021.0079 Lewis, L. F., et al. (2023). The lived experience of meltdowns for autistic adults. Autism, 27(7), 1787–1799. https://doi.org/10.1177/13623613221145783 Malik, J., et al. (2019). Emotional flooding in response to negative affect in romantic relationships. Journal of Couple & Relationship Therapy, 18(4), 327–349. https://doi.org/10.1080/15332691.2019.1641188 Gottman Institute. (2024, March 4). Making sure emotional flooding doesn’t capsize your relationship. Retrieved from https://www.gottman.com/blog/making-sure-emotional-flooding-doesnt-capsize-your-relationship/

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