12 Questions
What is one precaution mentioned for ensuring accurate measurement of catecholamines?
Prolonged exposure to platelets may increase catecholamine values
What is the recommended patient position prior to collecting samples for catecholamine testing?
Lying down for 15 to 30 minutes
Which food items should be restricted prior to the collection of urine samples for catecholamine testing?
Citrus fruits, vanilla, coffee
In which position do norepinephrine levels increase markedly according to the text?
Standing
Which hormone is the major intact catecholamine in urine?
Dopamine
Why is the measurement of urine metanephrines considered the assay of choice for Pheochromocytoma?
Catecholamines are easily degraded in the circulation
What can be used as a marker to follow the response of patients with adrenal medullary insufficiency to treatment?
Chromogranin A protein levels
In which conditions are increased norepinephrine and dopamine but not epinephrine seen?
Neuroblastoma
What is the primary reason for using antioxidants when collecting urine samples for catecholamine testing?
To stabilize catecholamines and prevent their breakdown
What restrictions should be followed in terms of food intake prior to collecting urine samples for catecholamine testing?
Avoid foods high in tyrosine
Why is it important to measure norepinephrine levels in different positions?
To differentiate between normal and pathological catecholamine levels
How does stress impact catecholamine values in the body?
Stress triggers the release of catecholamines, increasing their levels
Test your knowledge on precautions to consider when measuring catecholamines such as the impact of platelets and standing on norepinephrine levels. Learn why platelets may lower catecholamine values and how standing affects norepinephrine levels.
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