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Review Article
Online Published: 20 Oct 2026
 


Ionized hypocalcemia as a modifiable determinant of trauma-induced coagulopathy: a narrative review of the pathophysiological mechanisms, diagnostic thresholds, and empiric calcium repletion in massive transfusion protocols

Wasan Ali Alasmri, Dana Jameel Alhubayshi, Saja Yousef Alsulami, Rama Alsobhi, Retal Istanbuly, Sawsan Tawfiq Hanafi.


Abstract
Hemorrhage remains the leading cause of preventable death after major trauma, and resuscitation strategies have traditionally centered on the lethal triad of hypothermia, acidosis, and coagulopathy. Emerging evidence implicates ionized hypocalcemia as a fourth, mechanistically distinct contributor to this cycle, prompting proposals to reframe it as a lethal diamond. Ionized calcium is an obligate cofactor in multiple steps of the coagulation cascade, platelet activation, and vascular tone, and its depletion during massive transfusion arises from a combination of hemorrhage-related loss and citrate-mediated chelation from transfused blood products. This narrative review synthesized the mechanistic, epidemiologic, and therapeutic literature on this relationship, with three specific aims to summarize the physiology linking calcium to hemostasis, to critically evaluate the evidence supporting specific diagnostic thresholds for clinically significant hypocalcemia, and to review current data on empiric calcium repletion during massive transfusion. Across the reviewed literature, ionized hypocalcemia is consistently associated with worsened coagulopathy, greater transfusion requirements, and increased mortality; however, no consensus threshold for intervention exists, cutoffs across studies range from below 1.12 to below 0.90 mmol/L, and recent multicenter data suggest the calcium–outcome relationship might be parabolic rather than linear, with risk increasing at both low and supraphysiologic concentrations. Whether hypocalcemia meaningfully improves mortality prediction beyond the traditional triad remains contested. Current calcium repletion protocols, including widely adopted military and civilian guidelines, are based on retrospective and observational data rather than randomized trials. Early, proactive calcium monitoring and repletion during massive transfusion appears physiologically justified and pragmatically reasonable.

Key words: Ionized calcium, trauma-induced coagulopathy, massive transfusion, hypocalcemia, damage control resuscitation, lethal triad


 
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Pubmed Style

Alasmri WA, Alhubayshi DJ, Alsulami SY, Alsobhi R, Istanbuly R, Hanafi ST. Ionized hypocalcemia as a modifiable determinant of trauma-induced coagulopathy: a narrative review of the pathophysiological mechanisms, diagnostic thresholds, and empiric calcium repletion in massive transfusion protocols. IJMDC. Online First: 20 Oct, 2026. doi:10.24911/IJMDC.51-1788271678

Web Style

Alasmri WA, Alhubayshi DJ, Alsulami SY, Alsobhi R, Istanbuly R, Hanafi ST. Ionized hypocalcemia as a modifiable determinant of trauma-induced coagulopathy: a narrative review of the pathophysiological mechanisms, diagnostic thresholds, and empiric calcium repletion in massive transfusion protocols. https://www.ijmdc.com/?mno=333295 [Access: October 20, 2026]. doi:10.24911/IJMDC.51-1788271678

AMA (American Medical Association) Style

Alasmri WA, Alhubayshi DJ, Alsulami SY, Alsobhi R, Istanbuly R, Hanafi ST. Ionized hypocalcemia as a modifiable determinant of trauma-induced coagulopathy: a narrative review of the pathophysiological mechanisms, diagnostic thresholds, and empiric calcium repletion in massive transfusion protocols. IJMDC. Online First: 20 Oct, 2026. doi:10.24911/IJMDC.51-1788271678


Vancouver/ICMJE Style

Alasmri WA, Alhubayshi DJ, Alsulami SY, Alsobhi R, Istanbuly R, Hanafi ST. Ionized hypocalcemia as a modifiable determinant of trauma-induced coagulopathy: a narrative review of the pathophysiological mechanisms, diagnostic thresholds, and empiric calcium repletion in massive transfusion protocols. IJMDC, [cited October 20, 2026]; Online First: 20 Oct, 2026. doi:10.24911/IJMDC.51-1788271678


Harvard Style

Alasmri, W. A., Alhubayshi, . D. J., Alsulami, . S. Y., Alsobhi, . R., Istanbuly, . R. & Hanafi, . S. T. (2026) Ionized hypocalcemia as a modifiable determinant of trauma-induced coagulopathy: a narrative review of the pathophysiological mechanisms, diagnostic thresholds, and empiric calcium repletion in massive transfusion protocols. IJMDC, Online First: 20 Oct, 2026. doi:10.24911/IJMDC.51-1788271678


Turabian Style

Alasmri, Wasan Ali, Dana Jameel Alhubayshi, Saja Yousef Alsulami, Rama Alsobhi, Retal Istanbuly, and Sawsan Tawfiq Hanafi. 2026. Ionized hypocalcemia as a modifiable determinant of trauma-induced coagulopathy: a narrative review of the pathophysiological mechanisms, diagnostic thresholds, and empiric calcium repletion in massive transfusion protocols. International Journal of Medicine in Developing Countries, Online First: 20 Oct, 2026. doi:10.24911/IJMDC.51-1788271678


Chicago Style

Alasmri, Wasan Ali, Dana Jameel Alhubayshi, Saja Yousef Alsulami, Rama Alsobhi, Retal Istanbuly, and Sawsan Tawfiq Hanafi. "Ionized hypocalcemia as a modifiable determinant of trauma-induced coagulopathy: a narrative review of the pathophysiological mechanisms, diagnostic thresholds, and empiric calcium repletion in massive transfusion protocols." International Journal of Medicine in Developing Countries Online First: 20 Oct, 2026. doi:10.24911/IJMDC.51-1788271678


MLA (The Modern Language Association) Style

Alasmri, Wasan Ali, Dana Jameel Alhubayshi, Saja Yousef Alsulami, Rama Alsobhi, Retal Istanbuly, and Sawsan Tawfiq Hanafi. "Ionized hypocalcemia as a modifiable determinant of trauma-induced coagulopathy: a narrative review of the pathophysiological mechanisms, diagnostic thresholds, and empiric calcium repletion in massive transfusion protocols." International Journal of Medicine in Developing Countries Online First: 20 Oct, 2026. Web. 20 Oct 2026 doi:10.24911/IJMDC.51-1788271678


APA (American Psychological Association) Style

Alasmri, W. A., Alhubayshi, . D. J., Alsulami, . S. Y., Alsobhi, . R., Istanbuly, . R. & Hanafi, . S. T. (2026) Ionized hypocalcemia as a modifiable determinant of trauma-induced coagulopathy: a narrative review of the pathophysiological mechanisms, diagnostic thresholds, and empiric calcium repletion in massive transfusion protocols. International Journal of Medicine in Developing Countries, Online First: 20 Oct, 2026. doi:10.24911/IJMDC.51-1788271678




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