Related Experiment Video
Updated: Feb 14, 2026

Measuring Deformability and Red Cell Heterogeneity in Blood by Ektacytometry
Published on: January 12, 2018
A diagnostic red herring
Alexander J Martin-Bates1, Charles Martin-Bates2, Richard Withnall3
1Medical Reception Station, Defence Medical Services, Dhekelia Station, UK.
Abstract:
CLINICAL INTRODUCTION: A 29-year-old keen parachutist presented to the emergency services in Cyprus complaining of sudden-onset facial flushing, dizziness and a widespread rash. The episode began on a hot day, 1 hour after she had eaten a breakfast of tinned tuna, and while she was ascending in an aircraft to parachute from 10 000 ft. She completed her jump uneventfully. She had no significant medical history (figure 1).emermed;35/3/184/F1F1F1Figure 1Patient's legs on presentation; this rash was generalised.
Question:
Based on the history and rash, which ONE of the following is the most likely diagnosis?Fish allergyHeat-related eruptionScombrotoxin poisoningStress-induced urticaria.
Related Concept Videos
Red Algae
Appendicitis-II: Diagnostic Studies and Management
Diagnosing Appendicitis
It requires a multifaceted approach, starting with a detailed physical examination to pinpoint the location and nature of the pain and identify any associated symptoms. Laboratory tests play a crucial role. A complete Blood Count (CBC) typically reveals leukocytosis (an increased number of...
Myasthenia Gravis: Diagnostic Tests
The edrophonium test is a diagnostic tool for myasthenia gravis. It involves...
Asthma-IV: Diagnostic and Management
Clinical Assessment for Asthma:
This is the first step in diagnosing and managing asthma. It includes:
Pericarditis II: Clinical Features and Diagnostic Tests
Atherosclerosis II: Clinical Manifestations and Diagnostic Tests

