Laboratory Tests for Postural Tachycardia Syndrome (POTS)

Core Laboratory Tests

A comprehensive laboratory workup for POTS should include thyroid function tests, complete blood count, basic metabolic panel, and cardiac biomarkers to rule out secondary causes and guide treatment decisions, as recommended by Praxis Medical Insights 1
Complete blood count (CBC) is essential to evaluate for anemia which may contribute to orthostatic symptoms or exacerbate POTS 1
Basic metabolic panel is used to assess electrolyte abnormalities and renal function that may affect cardiovascular regulation 1
Thyroid function tests are necessary because thyroid disorders can mimic or exacerbate POTS symptoms and should be evaluated in all patients, according to the European Heart Journal 2
Glycohemoglobin (HbA1c) is used to screen for diabetes which can cause autonomic dysfunction, as reported in Circulation 3

Brain natriuretic peptide (BNP) may help identify cardiac causes of symptoms and assess for potential hypovolemic state, as stated in Circulation and Praxis Medical Insights 1 3
Serum electrolytes including calcium and magnesium are important for cardiac conduction and muscle function, according to Circulation 3

Laboratory testing should be targeted based on clinical assessment rather than ordering comprehensive panels without specific indications, as recommended by Praxis Medical Insights 1
Follow-up laboratory testing may be necessary to monitor treatment effects, particularly electrolytes if on medications affecting fluid balance, as reported in Circulation 3

Initial laboratory evaluation should include CBC, basic metabolic panel, thyroid function tests, and HbA1c, as recommended by Circulation, European Heart Journal, and Praxis Medical Insights 1 2 3
Cardiovascular assessment should include BNP, electrolytes including calcium and magnesium, as stated in Circulation and Praxis Medical Insights 1 3