Arab Board Clinical Pathology Part 1 Practice Questions - Arab Board Clinical Pathology Part 1 Written Examination (ABHS) Exam

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A routine serum chemistry panel on an asymptomatic 58-year-old man with essential thrombocythemia reveals a serum potassium of 6.6 mmol/L (reference: 3.5-5.0 mmol/L). A simultaneous ECG shows normal sinus rhythm with no peaked T waves or PR prolongation. His platelet count is 980 x 10^9/L. What is the most appropriate laboratory action to establish the true circulating potassium concentration?

Repeat the measurement using heparinized plasma maintained at room temperature Repeat the measurement on serum after 4 hours of clot retraction at 4°C Immediately administer intravenous calcium gluconate and insulin-dextrose Perform arterial blood gas analysis using an EDTA tube

Correct Answer:

Repeat the measurement using heparinized plasma maintained at room temperature

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