Medical Laboratory Quiz

Which bore (diameter) of the needle is the smallest?

• 20-gauge needle

• 21-gauge needle

• 16-gauge needle

• 23-gauge needle

The common needle gauges used for drawing blood with an evacuated system are:

• 20, 21, or 22 gauge

• 10, 12, or 14 gauge

• 16, 17, or 18 gauge

• 24, 25, or 26 gauge

Through which size needle will blood flow the fastest?

• 22

• 23

• 20

• 21

The unit of liquid volume in the metric system is the:

• meter

• millimeter

• liter

• gram

• centimeter

The gauge of the needle indicates the following relationship: the larger the gauge number, the:

• shorter the needle

• smaller the diameter of the bore

• larger the diameter of the bore

• longer the needle

In general, a syringe is used when drawing specimens and/or patients, EXCEPT for:

• persons with rolly veins

• requests for multiple testing, requiring different anticoagulants and multiple tubes

• persons with fragile vein walls

• arterial blood gases

Which anticoagulant prevents coagulation of blood by removing calcium through the formation of insoluble calcium salt?

• EDTA

• oxalate

• citrate

• lithium heparin

• A, B, and C

You are preparing to draw blood for multiple tests in several tubes. The best and most cost-efficient technique would be:

• syringe

• lancet

• butterfly system

• evacuated tube system

The anticoagulant heparin is used for blood gases and other chemistry tests. It works by:

• preventing the conversion of prothrombin to thrombin

• binding calcium ions

• activating tissue thromboplastin

• preventing the conversion of plasminogen to plasmin

All of the following statements are true EXCEPT:

• Gray-stoppered tubes are used for blood glucose tests.

• Red-stoppered tubes are used for many tests, including serum enzyme testing.

• Lavender-stoppered tubes are used for CBC, WBC, and platelet testing.

• Gray-stoppered tubes are used for CBC and WBC tests.