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Optional testing
(selected patients)
- Thyrotropin,
T4 (patients suspected of having underlying thyroid
disorder)
- Plasma catecholamines,
24-hour urinary catecholamines
(biochemical screen for pheochromocytoma, considered diagnostic
if plasma >2,000 pg/mL and suspicious if >500 pg/mL).
- Plasma cortisol
or cosyntropin stimulation test
(in patients suspected of having Cushing's disease)
- Microalbuminuria
or 24-hour-urine protein
(patients with diabetes or proteinuria by urinalysis; patients
suspected of having nephrotic syndrome)
- Duplex ultrasound
of renal vessels
(patients suspected of having renal artery stenosis)
- Echocardiogram
(patients suspected of having cardiac involvement or target organ
damage)
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