All EMS presentations
Endocrine/MetabolicClinical presentation

Hypoglycemia

A streamlined, differential-led presentation for rapid clinical review.

Clinical snapshot

Twenty-second review

  • Hypoglycemia deprives the brain of glucose and triggers autonomic responses, producing sweating, tremor, confusion, seizure, focal deficits, or coma.
  • Persistent altered state after glucose correction, recurrent low glucose, seizure, focal deficit, sulfonylurea use, or inability to maintain intake requires further assessment.
  • Keep stroke or intoxication in the differential; overlapping or concurrent illness remains possible.
  • For hypoglycemia, trends and combinations of findings are more informative than one isolated vital sign.
Differentials

Compare the clinical patterns

The repeated material is grouped inside each possibility. Open only the condition you need.

Serious2 conditions
ProlongedTime-sensitive high-risk possibility

HPI

Clarify initial bgl; initial loc/gcs; seizure.

Signs & symptoms

Seizure, coma, delayed recovery, or long-acting medication exposure.

Focused exam

Assess respiratory pattern, hydration, perfusion, temperature, neurologic status, and medication-delivery devices; Repeat glucose and clinical observations after treatment or during transport.

Brief pathophysiology

Prolonged may cause hypoglycemia through a time-sensitive process capable of rapid physiological deterioration.

Vital-sign pattern

What the trend may show

Possible pattern

Confirm low capillary glucose and reassess after treatment. Adrenergic signs may be absent in recurrent hypoglycemia or blunted by medications.

Blood glucose (mmol/L)

< 4.0 mmol/L

BCEHS defines hypoglycemia as blood glucose below 4.0 mmol/L.

Heart rate (bpm)

May rise

Adrenergic activation commonly produces tachycardia, but this is not universal.

Blood pressure (mmHg)

Often preserved

Blood pressure is not a reliable discriminator; hypotension suggests another or additional process.

Temperature (°C)

May fall

Hypothermia can accompany prolonged or severe hypoglycemia.

Front-load in the triage report

  • Prolonged: Seizure, coma, delayed recovery, or long-acting medication exposure.
  • Initial BGL.
  • Initial LOC/GCS.
Recurrent neuroglycopeniaTime-sensitive high-risk possibility

HPI

Clarify initial loc/gcs; seizure; insulin/hypoglycemic meds.

Signs & symptoms

Seizure, coma, delayed recovery, or long-acting medication exposure.

Focused exam

Repeat glucose and clinical observations after treatment or during transport; Check repeated BGL, neurologic status, swallowing safety, insulin sites or pumps, medication timing, food intake, and infection signs.

Brief pathophysiology

Recurrent neuroglycopenia may cause hypoglycemia through a time-sensitive process capable of rapid physiological deterioration.

Vital-sign pattern

What the trend may show

Possible pattern

Confirm low capillary glucose and reassess after treatment. Adrenergic signs may be absent in recurrent hypoglycemia or blunted by medications.

Blood glucose (mmol/L)

< 4.0 mmol/L

BCEHS defines hypoglycemia as blood glucose below 4.0 mmol/L.

Heart rate (bpm)

May rise

Adrenergic activation commonly produces tachycardia, but this is not universal.

Blood pressure (mmHg)

Often preserved

Blood pressure is not a reliable discriminator; hypotension suggests another or additional process.

Temperature (°C)

May fall

Hypothermia can accompany prolonged or severe hypoglycemia.

Front-load in the triage report

  • Recurrent neuroglycopenia: Seizure, coma, delayed recovery, or long-acting medication exposure.
  • Initial LOC/GCS.
  • Seizure?
Common1 condition
Medication-associated hypoglycemiaCommon presentation pattern

HPI

Clarify initial bgl; initial loc/gcs; seizure.

Signs & symptoms

Insulin or sulfonylurea effect combined with missed intake, exertion, or renal impairment.

Focused exam

Assess respiratory pattern, hydration, perfusion, temperature, neurologic status, and medication-delivery devices; Repeat glucose and clinical observations after treatment or during transport.

Brief pathophysiology

Medication-associated hypoglycemia may explain the presenting symptoms through a common clinical mechanism, while serial assessment checks for complications or an alternate cause.

Vital-sign pattern

What the trend may show

Possible pattern

Confirm low capillary glucose and reassess after treatment. Adrenergic signs may be absent in recurrent hypoglycemia or blunted by medications.

Blood glucose (mmol/L)

< 4.0 mmol/L

BCEHS defines hypoglycemia as blood glucose below 4.0 mmol/L.

Heart rate (bpm)

May rise

Adrenergic activation commonly produces tachycardia, but this is not universal.

Blood pressure (mmHg)

Often preserved

Blood pressure is not a reliable discriminator; hypotension suggests another or additional process.

Temperature (°C)

May fall

Hypothermia can accompany prolonged or severe hypoglycemia.

Front-load in the triage report

  • Insulin or sulfonylurea effect combined with missed intake, exertion, or renal impairment.
  • Initial BGL.
  • Initial LOC/GCS.
Mimics2 conditions
StrokeImportant alternative presentation

HPI

Clarify initial bgl; initial loc/gcs; seizure.

Signs & symptoms

Focal or behavioural findings may coexist and should be reassessed after correction.

Focused exam

Assess respiratory pattern, hydration, perfusion, temperature, neurologic status, and medication-delivery devices; Repeat glucose and clinical observations after treatment or during transport.

Brief pathophysiology

Stroke can resemble hypoglycemia through overlapping symptoms or referred physiology despite a different primary mechanism.

Vital-sign pattern

What the trend may show

Possible pattern

Stroke is a clinical diagnosis supported by time course and neurologic findings. Blood pressure and glucose affect eligibility and mimics; normal vitals do not exclude stroke.

Blood pressure (mmHg)

Often elevated

Hypertension is common in acute stroke; hypotension suggests another cause or poor perfusion.

Blood glucose (mmol/L)

Check every patient

Hypoglycemia can mimic focal deficit; hyperglycemia may accompany stress or diabetes.

Heart rate (bpm)

Assess rate / rhythm

An irregular rhythm may suggest atrial fibrillation but is not required.

Oxygen saturation (SpO₂)

Usually preserved

Hypoxemia requires correction and may indicate aspiration or another process.

Front-load in the triage report

  • Focal or behavioural findings may coexist and should be reassessed after correction.
  • Initial BGL.
  • Initial LOC/GCS.
IntoxicationImportant alternative presentation

HPI

Clarify initial loc/gcs; seizure; insulin/hypoglycemic meds.

Signs & symptoms

Focal or behavioural findings may coexist and should be reassessed after correction.

Focused exam

Repeat glucose and clinical observations after treatment or during transport; Check repeated BGL, neurologic status, swallowing safety, insulin sites or pumps, medication timing, food intake, and infection signs.

Brief pathophysiology

Intoxication can resemble hypoglycemia through overlapping symptoms or referred physiology despite a different primary mechanism.

Vital-sign pattern

What the trend may show

Possible pattern

Confirm low capillary glucose and reassess after treatment. Adrenergic signs may be absent in recurrent hypoglycemia or blunted by medications.

Blood glucose (mmol/L)

< 4.0 mmol/L

BCEHS defines hypoglycemia as blood glucose below 4.0 mmol/L.

Heart rate (bpm)

May rise

Adrenergic activation commonly produces tachycardia, but this is not universal.

Blood pressure (mmHg)

Often preserved

Blood pressure is not a reliable discriminator; hypotension suggests another or additional process.

Temperature (°C)

May fall

Hypothermia can accompany prolonged or severe hypoglycemia.

Front-load in the triage report

  • Focal or behavioural findings may coexist and should be reassessed after correction.
  • Initial LOC/GCS.
  • Seizure?
Red flags

Findings that should escalate concern

  • Persistent altered state after glucose correction, recurrent low glucose, seizure, focal deficit, sulfonylurea use, or inability to maintain intake requires further assessment.
  • Prolonged or recurrent neuroglycopenia: Seizure, coma, delayed recovery, or long-acting medication exposure.
Related medications

Medication recognition

Gliclazide MRInsulin glargineInsulin aspartLevetiracetamGlucagonValproic acid
Related EMS presentations

Continue the clinical pathway

General MedicalGeneral weakness / malaiseNeurologicAltered LOC / confusionNeurologicStroke / TIANeurologicSeizureEndocrine/MetabolicHyperglycemia / possible DKA-HHSGeneral MedicalMedication side effect / adverse reaction
References

Clinical and academic sources

Curated clinical guidance and peer-reviewed evidence supporting this presentation. Current BCEHS guidance, medical direction, and local policy remain authoritative for practice.

BCEHS Handbook — specific CPGs

  1. E01: Hypoglycemia and HyperglycemiaBC Emergency Health Services Handbook

    Official BCEHS clinical practice guidance for hypoglycemia and hyperglycemia.

Supporting clinical and academic evidence

  1. CEDIS Presenting Complaint List updateCanadian Association of Emergency Physicians

    Presenting-complaint terminology and categorization context. It does not establish a prehospital “top 100” ranking.

  2. Clinical Practice GuidelinesDiabetes Canada

    Canadian evidence-based guidance for diabetes, hypoglycemia, hyperglycemia, and related emergencies.

  3. Emergency treatment of hypoglycaemia: a guideline and evidence reviewDiabetic Medicine · 2017

    Evidence behind oral glucose, intravenous dextrose, glucagon, reassessment, and recurrent-risk evaluation.