Collection ProceduresQuestion 7 of 100
A provider orders a lactate and a blood alcohol level. Which tube additive combination is designed to preserve these analytes?
a.Sodium citrate
b.Lithium heparin
c.K2 EDTA
d.Sodium fluoride and potassium oxalate
Explanation
The gray-top tube contains sodium fluoride, an antiglycolytic agent that stops cells from consuming glucose or generating lactate, plus potassium oxalate as the anticoagulant. Citrate is for coagulation testing, heparin for stat chemistry, and EDTA for hematology; none of them inhibit glycolysis. Note that a non-alcohol antiseptic must also be used when collecting a blood alcohol.
Law Reference: CLSI GP41Practice all 100 questions free — no signup required.
Related questions on this topic
- Which antecubital vein is the first choice for routine venipuncture in an adult?
- At what angle to the skin should the needle be inserted for a routine antecubital venipuncture?
- Which needle gauge range is standard for routine adult venipuncture with an evacuated tube system?
- The light blue stopper tube used for PT/INR and aPTT contains which additive, and why must it be filled completely?
- A comprehensive metabolic panel is ordered. Which tube is appropriate and what does it contain?
- A stat ammonia level is ordered. Which tube is used and where does it fall in the order of draw?
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against NHA Certified Phlebotomy Technician (CPT) Exam · How we review