Your Physician Has Requested an Electrolyte Profile on a Patient

Your physician has requested an electrolyte profile on a patient.The laboratory directory indicates this test requires 4 mL of serum.Which of the following tubes should be used to collect the specimen?

A) 4-mL SST
B) 7-mL SST
C) 10-mL SST
D) 4-mL lavender-stoppered tube
E) 7-mL lavender-stoppered tube