A vehicle fire after an IED strike leaves the driver burned across the front of his torso and the front of both legs, with blisters on his face and hands. His crew pulls him clear and puts a tourniquet on a mangled lower leg before anyone looks at the burns. At the casualty collection point the bleeding is controlled, his radial pulse is strong, and he answers questions. The medic counts blistered and leathery skin with the Rule of Nines and gets close to 40% TBSA (total body surface area). He weighs about 90 kg without his kit, an IO line is in, and the medic has one number left to set.
That number is the Rule of Ten starting rate: 500 mL/hr for this casualty. The formula is the easy part. The errors come from counting the wrong skin, running the rate up without a reason, and letting a burned casualty get cold.
The 1 May 2026 TCCC Guidelines open the burn section with a sequencing rule: assess and treat a trauma casualty with burns, not a burn casualty with injuries [1]. Resuscitation for hemorrhagic shock takes precedence over resuscitation for burn shock [1]. If this driver had been in shock from the leg wound, blood products would come first and the burn formula would wait.
The burn finding that moves up the list is the airway. Facial burns, especially from an enclosed space such as a vehicle, may come with inhalation injury. TCCC calls for close monitoring of airway status and oxygen saturation, and consideration of an early surgical airway for respiratory distress or desaturation [1]. Every other TCCC intervention can be done on or through burned skin [1].
The pattern in the scene is the common one. Among 274 burn patients from Iraq and Afghanistan treated at the US Army Institute of Surgical Research from 2003 to 2005, 52% were burned in hostile explosions. The hands were burned in 80% and the face in 77%, and inhalation injury rose from 5% to 26% across the study period [3].
TCCC estimates burn size to the nearest 10% with the Rule of Nines [1]. The 2025 Joint Trauma System (JTS) Burn Care guideline adds the rule that matters most at this step: superficial (first-degree) burns are not included in the estimate [2]. Red, intact skin does not count. Blistered partial-thickness and full-thickness burns do.
Overestimation is the usual error. A systematic review of 28 studies and 6,461 patients found low agreement between referring units and burn centres, and most direct comparisons showed overestimation in 50% or more of patients [5]. In a 2026 Swedish series of 82 referrals, most with small burns (median 6% to 10% TBSA), non-specialists overestimated burn size in 76% of cases. The error grew with larger burns and with more than two separate burn areas [6]. Both studies come from civilian referral systems, not field care. The pattern that drove the error in Sweden, large burns in scattered patches, is the pattern an explosion produces.
TBSA is a multiplier. Every 10% added by counting red skin adds 100 mL/hr to the starting rate.
TCCC starts burn resuscitation when the burn exceeds 20% TBSA, as soon as IV or IO access is established [1]. The steps:
For the driver: 40 × 10 = 400 mL/hr, plus 100 mL/hr for the 10 kg above 80 kg, gives 500 mL/hr.
The rule came from the US Army Institute of Surgical Research. In a computer simulation of 100,000 adult weight and burn-size combinations, 87.8% of Rule of Ten starting rates fell between the rates from the modified Brooke formula (2 mL/kg/%TBSA) and the Parkland formula (4 mL/kg/%TBSA). Fewer than 12% fell below the Brooke rate and fewer than 1% above the Parkland rate [4]. The rule was validated in simulation, not in an outcome trial, and it sets a starting rate only.
The fluid choice depends on which document you read. The 2026 TCCC Guidelines list Lactated Ringer's, normal saline, or Hextend, with Hextend capped at 1,000 mL [1]. The 2025 JTS Burn Care guideline names Lactated Ringer's or PlasmaLyte A as the preferred fluids and says to avoid normal saline if possible [2]. Where the two differ, Lactated Ringer's satisfies both.
Oral fluids are an option for smaller burns. TCCC allows oral fluids to be considered for burns up to 30% TBSA when the casualty is conscious and can swallow [1]. The JTS guideline avoids oral resuscitation with abdominal injury, vomiting, or burns over 40% TBSA, and requires an isotonic salt and sugar solution; it warns that sports drinks cause severe hyponatremia [2]. The driver, at 40%, is past the TCCC limit, so his resuscitation goes through the IO.
The Rule of Ten sets the first hour. After that, urine output drives the rate. The JTS target for adults is 30 to 50 mL/hr [2]. When urine output stays above that range, turn the rate down.
Over-resuscitation has a name. Saffle described "fluid creep" in 2007: burn patients receiving far more fluid than the Parkland formula predicts, with edema building in unburned tissue after the first 8 hours, linked to abdominal compartment syndrome [7]. The JTS guideline puts a number on the danger: more than 250 mL/kg in the first 24 hours raises the risk of abdominal and extremity compartment syndromes, and it warns that fluid creep happens along the continuum of care when documentation is poor [2]. For the 90 kg driver, 500 mL/hr for 24 hours is 12 L. The 250 mL/kg line is 22.5 L. A rate that climbs each time someone sees a soft blood pressure closes that gap fast.
Write down the TBSA estimate, the start time, the fluid, every rate change with its time, and the urine output. The next team inherits your resuscitation, and the en route care handoff is where it is most often lost. When evacuation is delayed for hours, the same rules carry into prolonged casualty care.
Cover burns with dry, sterile dressings. For burns over 20% TBSA, TCCC says to consider a heat-reflective shell or blizzard survival blanket, and it singles out burn casualties as especially prone to hypothermia [1]. The general hypothermia steps apply: get the casualty off cold ground, replace wet clothing, warm IV and IO fluids, and place an active heating blanket over the anterior torso and axillae, never directly on skin [1]. On a casualty whose chest is burned, that blanket goes over the dressings. The kit options are compared in self-warming blankets in combat casualty care.
The JTS guideline adds two field rules. Rinse dirt and chemicals with clean water, brushing dry chemicals off first, and leave blisters intact until the casualty reaches a facility with emergency medical or surgical capability [2].
Treat burn pain under the TCCC analgesia section [1], covered in TCCC 2026 analgesia. Burns alone are not an indication for prehospital antibiotics. The TCCC antibiotic section covers all open combat wounds and invasive procedures, so the driver gets antibiotics because of his mangled leg [1].
It is the US Army Institute of Surgical Research method for the starting IV fluid rate in adult burns. Multiply %TBSA by 10 to get mL/hr for a casualty of 40 to 80 kg, and add 100 mL/hr for each 10 kg above 80 kg [1,4]. It sets the first rate only, and urine output decides the rate after that.
When the burn exceeds 20% TBSA, as soon as IV or IO access is in place [1]. A casualty in hemorrhagic shock gets hemorrhagic shock resuscitation first. Below 20%, cover the burn, prevent heat loss, and treat the other injuries.
TCCC allows oral fluids to be considered for burns up to 30% TBSA if the casualty is conscious and able to swallow [1]. The JTS guideline avoids it with abdominal injury, vomiting, or burns over 40% TBSA, and the fluid must be an isotonic salt and sugar solution [2]. Sports drinks are the wrong choice because they cause severe hyponatremia [2].
I have spent my career as an emergency physician and medical director, and I now serve as State Surgeon. From every one of those seats, the burn casualty is the one I worry about being under-rehearsed. This article gets the order right. The formula is a single multiplication, so it is rarely the problem. The problems sit on either side of it: a medic who counts reddened skin as burn, and a team downstream that answers every soft pressure with another bump in the rate. The core argument holds. The Rule of Ten is an opening move, and it was never meant to run unattended for a day. A rate that nobody owns will drift, and it drifts in one direction. Treat the starting rate as a hypothesis that the next hour of urine output either confirms or corrects.
That being said, the article understates one thing about the field. A urine-output target assumes you can measure urine. At a casualty collection point, or in the back of a vehicle, that means a catheter you may not have placed and a bag nobody is watching. The honest answer is that early burn titration in the field runs on a starting rate, a clock, and a disciplined refusal to change the rate without a reason you can write down. The two governing documents also disagree on which fluid to hang, and the casualty does not care which committee wrote which line. Settle that question in your unit protocol before the mission leaves the wire. Then make sure the receiving role knows what you settled.
If you are the medic, practice the arithmetic until you can do it while someone talks to you. Then practice the TBSA count on a moulaged trainer with scattered burns, because scattered burns are where the count goes wrong. Write the rate, the time, and the reason on the casualty card every time you change it, even when the change feels too small to matter. If you are the medical officer, build a burn into every mass casualty exercise this year, and make the evaluator check the casualty card at handoff, not just the hands on the casualty. Grade the TBSA count separately from the fluid rate, because they fail for different reasons and need different fixes. A burn resuscitation that nobody wrote down has to start over at the next role.
— Chester Shermer, MD, FACEP | Emergency Medicine, 25+ Years Clinical Experience | State Surgeon
If you're a combat medic, corpsman, flight medic, or military medical officer (or any clinician treating patients daily) trying to understand how AI will actually impact your clinical practice — not just the hype — I put together a free practical guide. You can download the AI in EM Survival Guide here.
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Relevant Reading on Global MedOps Command:
How to Avoid Becoming an AI Casualty — Dr. Shermer's guide to navigating AI tools in clinical and operational settings without compromising judgment or patient outcomes.
Emergency Department Efficiency Playbook — Practical systems for throughput, triage optimization, and operational efficiency.
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Connect with Dr. Shermer: LinkedIn — Chester "Chet" Shermer, MD, FACEP.
Related simulation training: EMS-MedSim for civilian prehospital burn care · Books by Dr. Shermer