When should I go to emergency services?

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Patients with fever and any of the following signs or symptoms should visit a hospital emergency department as soon as possible:

Aneroid or manual sphygmomanometer with a warning signal

Low blood pressure (less than 100 mmHg), high respiratory rate (over 22 breaths per minute) or a decreased level of consciousness.

Central nervous system in pain

Neurological symptoms such as intense headache, focal neurological deficit (functional problems in the brain, spinal cord and nerves that affect a specific site, such as the left side of the face, the right arm or even just a small area, e.g., the tongue) or epileptic seizures.

Man with skin blemishes

Generalised skin eruption or red/purple skin lesions, which appear in the context of fever and neurological symptoms.

Travelling by plane

Fever after travelling to a tropical country.

Elderly man with a cane

Fever in an elderly or immunocompromised patient (e.g., hematooncological, chemotherapy, solid organ or bone marrow transplant patients, and those with primary or secondary immunodeficiencies such as HIV infection).

Scissors and scalpel

Fever in patients who have undergone surgery or a diagnostic endoscopic test, particularly if they were subjected to any type of biopsy.

Standing person with abdominal pain

Fever accompanied by abdominal pain, chest pain that increases when breathing (pleuritic pain), and which has lasted for several days without responding to medically prescribed treatment.

When a previously healthy patient develops fever associated with upper respiratory tract symptoms (runny nose, pain when swallowing, dry cough) or urinary symptoms without lower back pain, then they should initially consult their primary healthcare team.

Tests in an emergency department

The first thing healthcare personnel will do when a patient visits an emergency department due to fever is:


Thermometer with a danger signal indicating fever

Measure their body temperature.

Electrocardiogram monitor

Measure their vital signs (blood pressure, heart rate and respiratory rate).

Folder with a patient's medical history

Enquire about their medical history (background, reason for consultation and any current illnesses).


Perform a physical examination (cardiac and respiratory auscultation, abdominal palpation and neurological assessment).

After the medical consultation, they will decide which additional tests are required to determine the patient’s clinical picture. They will often request:

Blood collection tube

A blood test

Urine sample cup with bar code

A urine test

Person having a chest X-ray done

A plain chest and/or abdominal X-ray, depending on the clinical manifestations.

These examinations are usually carried out in the emergency department.

After the initial clinical assessment and complementary tests, the doctor will provide a diagnostic impression of the clinical picture and recommend an appropriate treatment. Additionally, they may decide that the patient can either be discharged or that there is a need for further tests, a few hours of observation or even admission to hospital.

Complementary tests

If the doctor deems them appropriate, further radiological tests (abdominal ultrasound, CT brain scan, amongst others) may be performed in the radiology department. They may also ask for blood and urine cultures. The doctor may ask nursing staff  to take blood or collect a urine sample in some special containers that will be sent to the microbiology laboratory. These cultures are incubated in special machines and need to be left a few days (from 3 to 5 days) before they give a definitive result. These results are not usually essential for formulating an initial impression of the patient’s clinical condition.

Substantiated information by:

Mar Ortega Romero

Published: 20 February 2018
Updated: 20 February 2018


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