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10 free EMT practice questions: Hematologic, Immunologic & Infectious Disorders

These are real questions from the same bank the app draws from. Each one is written to the NREMT EMT content specifications and kept inside the EMT scope of practice. Pick an answer and you get the full rationale, including why the other three options are wrong.

Work through all 10, then move on to the next topic. When you want the full picture, the free EMT diagnostic covers every topic in one sitting. No account needed for any of it.

Question 1 of 10

EMS is called to a nursing facility for an 81-year-old patient with a known urinary tract infection. The vital signs are BP 94/58 mmHg, P 118/min, R 24/min, and temperature 102.1°F, and staff report the patient is more confused than usual today. The skin is warm and flushed. Which of the following best describes this presentation?

Show the answer and rationale

Correct answer · Consistent with sepsis: infection with a systemic response, blood pressure not yet hypotensive

Sepsis is an infection plus a body-wide response to it, and every piece of that is on the board here: a known urinary tract infection as the source, a temperature of 102.1, a pulse of 118, respirations of 24, and new confusion. In an elderly patient, altered mental status is often the first and loudest sign, so staff reporting that the patient is more confused than usual today is exactly the trigger that should start this thought. The clinching distinction between sepsis and septic shock is the blood pressure: adult hypotension starts below a systolic of 90, and 94 has not crossed that line, so this is sepsis with the pressure still holding. The warm, flushed skin fits as well, because the vessels are dilating in response to the infection, which is why this patient does not look like the cool, pale shock most students picture.

Why the others are wrong

Not an early sign of sepsis, since the blood pressure is within the normal range: This gets the meaning of a normal blood pressure exactly backwards. Blood pressure is the last thing to fail, because the body compensates with a faster heart rate and constricted vessels long before the number falls, which is precisely why fever, tachycardia, tachypnea, and new confusion are the early findings worth acting on. Waiting for hypotension before calling it sepsis means waiting until the patient is already in septic shock. The key recognizes it while the pressure is still holding, which is the entire point of the question.

Consistent with septic shock, since a systolic blood pressure of 94 mmHg is already hypotensive: Septic shock is a real label and it may well be where this patient is heading, but it applies once perfusion fails despite treatment, with a systolic below 90 or evidence of hypoperfusion that fluids do not correct. The number in this question is 94. That is close, and it warrants transport and close monitoring, but the definition is a threshold rather than an impression, and 94 is above 90. Sepsis and septic shock are separated by exactly this one measurement.

Consistent with hypovolemic shock, given the patient's age and cool, pale skin: Hypovolemic shock would be right for a patient who lost volume through vomiting, diarrhea, bleeding, or poor intake, and the tell is skin that is pale, cool, and clammy as vessels clamp down to preserve core perfusion. The question says the skin is warm and flushed, which contradicts this option's own stated reasoning, and it names an ongoing urinary tract infection. Warm and flushed means vessels dilating, which is distributive; cool and pale means vessels constricting around a volume that is gone.

Question 2 of 10

A 16-year-old patient with thalassemia major (who receives scheduled blood transfusions every 3-4 weeks) presents with severe fatigue, difficulty breathing, dizziness, and a notably pale appearance. According to the patient's mother, the patient is due for the next transfusion in 2 days and has been feeling progressively weaker over the past week. Vital signs are BP 108/64 mmHg, P 106/min, R 20/min, and SpO2 94%. The patient denies any recent bleeding or trauma. What is the most likely cause of this patient's acute symptoms?

Show the answer and rationale

Correct answer · Acute worsening of chronic hemolytic anemia from increased red blood cell destruction

Thalassemia major is a severe chronic hemolytic anemia requiring regular transfusions to maintain adequate hemoglobin and oxygen-carrying capacity. Between transfusions, ongoing red blood cell destruction steadily lowers the hemoglobin, so the patient is at his worst right before the next unit is due, and that is precisely where this patient sits, due in 2 days after a week of progressive weakness. Fatigue, difficulty breathing, dizziness, pallor, a pulse of 106, and an SpO2 of 94% are all what too few red cells looks like: the lungs are working fine, there is simply not enough hemoglobin to carry what they deliver, so the heart speeds up to compensate. The timeline is the clincher: a slow slide that tracks the transfusion interval, not an abrupt event.

Why the others are wrong

Acute hemolytic transfusion reaction from the blood products given at the last transfusion: An acute hemolytic transfusion reaction is what you suspect when symptoms begin during or shortly after a unit is transfused: fever, chills, back or flank pain, dark urine, a sense of impending doom, within minutes to hours. The timeline here runs the other way: the last transfusion was weeks ago, he is at the far end of the interval and due for his next one, and the decline built over a week rather than arriving suddenly.

Acute heart failure from circulatory volume overload caused by repeated blood transfusions: Circulatory overload from transfusion is a real risk in chronically transfused patients, but it presents as fluid the heart cannot handle: orthopnea, crackles, jugular venous distention, and it follows a transfusion rather than preceding one. It also does not cause pallor; pale skin points at too few red cells, not too much volume.

Sepsis from an unrecognized bacterial infection causing the fatigue and rapid pulse: Sepsis deserves consideration in any chronically transfused patient, and fatigue with a pulse of 106 fits it loosely, which is what makes it a reasonable-looking option. What is missing is the infectious half of the picture: no reported fever, no source, and a blood pressure of 108/64 that is holding. Sepsis also deteriorates over hours to a day or two, not in a one-week slope that lines up exactly with a transfusion schedule.

Question 3 of 10

The EMT is treating a 4-year-old child in anaphylaxis following a bee sting. A pediatric epinephrine auto-injector is available. How should the EMT administer it?

Show the answer and rationale

Correct answer · Intramuscularly into the lateral thigh

Two things have to be right about any medication: the drug and the route. In anaphylaxis, epinephrine is the drug. It constricts the dilated vessels that are dropping the blood pressure, relaxes the bronchial smooth muscle that is closing the airway, and slows further mediator release, and intramuscular into the lateral thigh is the route. The thigh is chosen because the vastus lateralis is a large muscle with a rich blood supply lying just under the skin, so absorption is fast and reliable even as the patient shuts down peripherally, and it is a site you can reach through clothing without repositioning a frightened child. The auto-injector is built for exactly that depth and that site, which is a large part of why it is an EMT-scope device: the design does the measuring and the aiming for you.

Why the others are wrong

Intravenously over 2 minutes: Intravenous epinephrine is used in anaphylaxis, but only for the arresting or profoundly refractory patient, and only by paramedic or physician-level providers using a far more dilute concentration with careful titration. Two things rule it out here: it is outside EMT scope entirely, and giving epinephrine intravenously to a 4-year-old carries real potential for dysrhythmia and severe hypertension. Same drug, wrong route and wrong level.

Subcutaneously into the upper arm: Subcutaneous injection is a legitimate route for other medications and was historically used for epinephrine in asthma. Subcutaneous tissue is poorly vascularized compared with muscle, and in anaphylaxis peripheral perfusion is already failing, so the drug sits in the fat and reaches the circulation slowly, precisely the wrong property when the airway is closing now. The auto-injector's needle is also sized to reach muscle, so it would not deliver the route this option names.

Intraosseously if venous access cannot be obtained: Intraosseous access is the answer when a critically ill patient needs vascular access fast and veins cannot be found, and it is a genuinely valuable skill at the AEMT and paramedic level. It is not an EMT skill, and more to the point it solves a problem this child does not have: the drug that reverses anaphylaxis works well intramuscularly, and stopping to establish any vascular access first would delay the single intervention that actually turns this around.

Question 4 of 10

A 48-year-old patient developed stridor and severe throat swelling 10 minutes after a medication injection. An epinephrine auto-injector was administered, but swelling and stridor persist. The patient is alert and anxious, breathing with difficulty, the oxygen saturation is 91% on room air, and the airway is patent but compromised by edema. How should the EMT position and oxygenate this patient during transport?

Show the answer and rationale

Correct answer · Position him upright or semi-upright, and provide high-flow oxygen

In anaphylaxis with airway compromise from throat edema, upright or semi-upright positioning uses gravity to reduce pressure of swelling on the airway and enables the patient to use accessory muscles more effectively. Combined with high-flow oxygen, this strategy maximizes oxygenation while epinephrine takes effect and during urgent transport to a facility capable of advanced airway intervention.

Why the others are wrong

Place him supine with his head turned to the side: Supine positioning increases pressure on the compromised airway from dependent edema and gravity, worsening obstruction and breathing effort.

Place him in the prone recovery position: Prone recovery position is used for unconscious patients at risk of aspiration, not for alert patients with active airway compromise; it may further restrict an already edema-swollen airway.

Allow him to remain in whatever position feels most comfortable: Patient self-positioning risks supine posture or other suboptimal positions; active upright positioning is the medically indicated strategy in this scenario.

Question 5 of 10

The EMT is treating a 44-year-old patient who ate shellfish 30 minutes ago. The patient has widespread hives on the trunk and extremities but denies any difficulty breathing or throat tightness. However, the EMT notes the patient's baseline heart rate (which the patient reports is normally 68/min) is now 106/min, and the patient's baseline blood pressure (normally 132/82 mmHg) is now 98/60 mmHg. What is the most appropriate interpretation of these vital-sign changes?

Show the answer and rationale

Correct answer · The vital signs indicate systemic involvement and progression toward anaphylaxis

The numbers are the whole item. This patient's pulse has gone from a baseline of 68/min to 106/min and the blood pressure has fallen from a baseline of 132/82 mmHg to 98/60 mmHg. Neither reading is dramatic in isolation, and a systolic of 98 mmHg would not by itself be called hypotension in most adults. Measured against this patient's own baseline, though, it is a 38-beat rise in pulse and a 34-point drop in systolic pressure within 30 minutes of a known allergen exposure. That is systemic involvement, which is what separates anaphylaxis from an allergic reaction confined to the skin. The mechanism explains why the vital signs move before the airway does. Mast cells and basophils release histamine and other mediators throughout the body, not just at the exposure site. Histamine dilates blood vessels and makes capillaries leak plasma into the tissues, so vascular capacity increases while intravascular volume falls. Blood pressure begins to drop, and the heart compensates with tachycardia. Anaphylaxis is a form of distributive shock, and the falling blood pressure with a rising pulse is that shock beginning, not anxiety. The false discriminator here is the absence of respiratory symptoms, and it is the reason this item is worth studying. Many candidates learn anaphylaxis as an airway diagnosis and wait for wheezing, stridor, or throat tightness before treating. Anaphylaxis is defined by involvement of more than one body system after an allergen exposure, and hypotension after exposure to a known allergen qualifies on its own. This patient has skin involvement and cardiovascular involvement, which is two systems. The airway may never be the first system to fail, and waiting for it to fail is how a treatable reaction becomes an arrest. Practically, this changes the treatment. A reaction confined to the skin is managed with monitoring and transport. Systemic involvement calls for epinephrine, and the whole point of recognizing the vital-sign trend early is that epinephrine works best before compensation fails. The patient should also be kept supine with the legs elevated if tolerated, because sitting a hypotensive anaphylaxis patient upright can drop the preload further, and should be reassessed continuously, since these reactions can worsen in minutes.

Why the others are wrong

These are normal anxiety responses to seeing hives; transport is not urgent: Anxiety can raise a pulse, but it does not drop a systolic pressure 34 points below the patient's own baseline. Attributing this to anxiety and downgrading the urgency delays the one time-critical treatment this patient needs.

Tachycardia and mild hypotension are expected with urticaria and will resolve spontaneously: Tachycardia and a falling blood pressure are not expected findings in a reaction confined to the skin, which is exactly the point. Urticaria alone leaves the vital signs unchanged; once they move, the reaction is no longer localized, and calling it self-limiting means waiting for deterioration.

These vital signs suggest a different condition unrelated to the allergic reaction: The timing, 30 minutes after eating a common allergen, together with widespread hives, makes the allergic origin clear. Searching for an unrelated cause here would delay treatment for the condition already in front of the EMT.

Question 6 of 10

A 16-year-old patient is stung by a wasp and quickly develops urticaria (hives), facial flushing, and mild itching. The patient denies difficulty breathing or throat tightness and appears calm. Their vital signs are BP 118/74 mmHg, P 88/min, R 14/min, SpO₂ 99%. Which findings are present that would make this a localized allergic reaction rather than anaphylaxis requiring epinephrine?

Show the answer and rationale

Correct answer · Absence of respiratory involvement, normal vital signs, and lack of systemic symptoms

The line between an allergic reaction and anaphylaxis is not how impressive the skin looks. It is whether the reaction has gone systemic. Anaphylaxis means two or more body systems involved, or one system failing hard: airway swelling or stridor, wheezing and hypoxia, hypotension, vomiting and cramping. Everything this patient has is skin: hives, flushing, itching, and every other system checks out: she denies difficulty breathing and throat tightness, her pressure is 118/74, her pulse is 88, her saturation is 99%. That is a localized reaction, managed supportively, with transport for observation because a reaction that starts in the skin can still escalate over the next hour.

Why the others are wrong

The presence of hives alone indicates anaphylaxis; epinephrine should be given: Hives plus involvement of a second system is anaphylaxis, and skin findings show up in most anaphylaxis cases, so watching for them is correct reasoning. Alone they are not enough: epinephrine is indicated for airway, breathing, or circulatory compromise, and this patient has a clear airway, no respiratory complaint, and a normal pressure and pulse. Giving epinephrine to an isolated urticarial reaction adds tachycardia, tremor, and anxiety to a patient with no shock to reverse.

The insect sting as the trigger; anaphylaxis only occurs with food allergies: Insect stings are one of the most common anaphylaxis triggers in EMS, so this option has the association exactly backwards. Any allergen can do it: foods, stings, medications, latex, because the reaction is the immune system's response, not a property of the substance. The trigger never tells you the severity; the systems involved do, and that is what the key is reading.

The patient's young age; teenagers rarely develop true anaphylaxis: Age matters for a few things in EMS, like how well pediatric patients compensate and how atypically the elderly present, so age-based reasoning is not absurd on its face. It offers no protection here: a 16-year-old releases the same mediators as anyone else, and severe reactions in teenagers are routine. What keeps this a localized reaction is the absence of respiratory and cardiovascular involvement, not the patient's age.

Question 7 of 10

During patient care, an EMT sustains a splash of blood and saliva directly to the eye and mouth while controlling hemorrhage from a patient with unknown bloodborne pathogen status. The EMT's immediate priority after stopping direct patient care is:

Show the answer and rationale

Correct answer · Immediately rinse the affected eye and mouth with copious water or saline for at least 15 minutes

When blood or body fluids contact mucous membranes (eyes, nose, mouth), the EMT must immediately irrigate the affected area(s) with copious amounts of running water or saline for at least 15 minutes. This removes pathogens and reduces the risk of bloodborne pathogen transmission. Mucous membranes are high-risk portals of entry. Immediate action is critical.

Why the others are wrong

Complete the patient handoff at the hospital, then shower as soon as possible at the station: Incorrect. Delaying irrigation until after transport and return to station allows pathogens more time to penetrate mucous membranes. B is the correct priority.

Continue transport while wearing a protective face shield, and report the exposure after arrival at the ED: Incorrect. Continuing patient care before addressing the exposure risks both the EMT's health and, if gloves are contaminated, cross-contamination to the patient. The exposure must be managed immediately.

Apply antibiotic ointment to the eye and rinse the mouth with mouthwash: Incorrect. Antibiotic ointment and mouthwash are not replacements for irrigation with water or saline and do not remove the pathogen.

Question 8 of 10

A woman was stung by a wasp fifteen minutes ago. Which finding would mean her allergic reaction has become anaphylaxis?

Show the answer and rationale

Correct answer · Stridor

An allergic reaction becomes anaphylaxis the moment it reaches the airway, the breathing, or the circulation. Stridor is the high-pitched sound of air squeezing through an upper airway that is swelling shut, so it puts the reaction in the airway, and that is the line between an allergic reaction and anaphylaxis. It's also the finding that means epinephrine now and a fast transport, not watching and waiting.

Why the others are wrong

Hives: You'd pick this if hives looked severe enough to mean the worst, and they are the classic sign of an allergic reaction, but they live on the skin. Skin findings alone, however widespread, are the reaction itself, not anaphylaxis.

Itching: comes with the hives; it's the skin reacting to histamine, and by itself it says nothing about the airway, the breathing, or the blood pressure.

Watery eyes: the same histamine effect on the eyes, uncomfortable and not dangerous. The reaction has to reach the airway, the lungs, or the circulation before it counts as anaphylaxis.

Question 9 of 10

A 29-year-old patient develops audible wheezing, hives across both arms, and swelling of the lips within minutes of eating a granola bar containing peanuts. The patient is anxious, sitting upright, and speaking in short sentences. The patient's own prescribed epinephrine auto-injector and albuterol metered-dose inhaler are both within reach. The vital signs are BP 92/58 mmHg, P 118/min, and R 26/min, with SpO₂ 93% on room air. What should the EMT do first?

Show the answer and rationale

Correct answer · Assist the patient with the epinephrine auto-injector

The hives, lip swelling, wheezing, and low blood pressure together meet the criteria for anaphylaxis, for which epinephrine is the definitive treatment and treatment priority, and it should be given first rather than delayed for other interventions.

Why the others are wrong

Assist the patient with the albuterol inhaler: A student focused on the wheeze might reach for the bronchodilator first, but albuterol only relieves bronchospasm. It does not address the hypotension and lip swelling that show the reaction is systemic, not confined to the lower airway.

Contact medical control before giving any medication: A student may believe every medication requires prior authorization, but assisting a patient with their own already-prescribed epinephrine auto-injector does not require contacting medical control first, and the low blood pressure makes that delay dangerous.

Apply a nonrebreathing mask and continue to reassess: A student might reach for oxygen as the safest first move, but oxygen alone does not treat the hypotension or lip swelling driving this presentation, and epinephrine is the definitive treatment that should not be delayed for it.

Question 10 of 10

A patient in a sickle cell crisis reports severe pain and appears fatigued. The vital signs are stable except for tachycardia. Which of the following is the most appropriate EMT management?

Show the answer and rationale

Correct answer · Supportive care, position of comfort, oxygen if hypoxic

EMT management of a sickle cell vaso-occlusive crisis is primarily supportive: position of comfort, psychological support, minimizing unnecessary movement, and transport for evaluation and appropriate pain management. Supplemental oxygen is titrated to actual oxygenation status: give it if the patient is hypoxic or in respiratory distress, but routine oxygen for a patient who is not hypoxic is not clearly beneficial and is not automatically indicated; pain and IV fluid management beyond this are hospital/AEMT-paramedic-level interventions.

Why the others are wrong

Restrict oral fluids to reduce the risk of further vaso-occlusion: This has hydration exactly backwards. Dehydration concentrates the blood and promotes sickling, so fluid is protective in a vaso-occlusive crisis rather than harmful, restricting it makes the crisis worse.

Apply cold packs to the most painful joints for comfort: Cold is the reflex for painful joints and it is the wrong instinct in this disease. Cooling causes peripheral vasoconstriction, which slows flow through already-obstructed vessels and can extend the crisis; warmth is the comfort measure that fits the mechanism.

Withhold pain management until the crisis is confirmed: Waiting for confirmation misunderstands where the diagnosis comes from. A patient with known sickle cell disease describing the pain pattern of their own crisis does not need field confirmation before receiving analgesia, and deferring pain control in this condition is a well-documented gap in care rather than caution.

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