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A week ago
Which of the following additives is preferred when drawing blood samples to measure parathyroid hormone (PTH)?

▸ Sodium citrate because PTH is most stable using this additive

▸ Acid citrate dextrose because PTH is least stable using this additive

▸ Potassium (3)-EDTA (K3-EDTA) because PTH is most stable using this additive

▸ Sodium fluoride/potassium oxalate because PTH will complex with oxalate to increase its stability
Textbook 
Clinical Laboratory Chemistry
Edition: 2nd
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Potassium (3)-EDTA (K3-EDTA) because PTH is most stable using this additive
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