Chapter 10

Question 1

Capillary puncture devices

Answer 1

Lancet/incision devices
Laser lancet (ages 5+)
Finger puncture lancet
Heel puncture lancet

Question 2

Capillary blood gas equipment (CBG)

Answer 2

CBG collection tubes
Stirrers
Magnet
Plastic caps

Question 3

Warming devices increase

Answer 3

Blood flow up to 7x

Question 4

Capillary specimen composition

Answer 4

Mixture of arterial, capillary and venous blood with interstitial fluid and intracellular fluid
Higher in arterial blood, especially if it’s been warmed

Question 5

Capillary reference values versus venous

Answer 5

They differ. Glucose is higher in capillary while total protein, calcium, and potassium is lower

Question 6

Why use capillary puncture on adults

Answer 6

Fragile veins
Multiple unsuccessful venipunctures
POCT

Question 7

What newborn test prefers capillary collection

Answer 7

Newborn screening tests

Question 8

Tests that cannot be collected via capillary puncture

Answer 8

Most ESR
coagulation requiring plasma
Blood cultures
Tests that require large amounts of blood

Question 9

Capillary order of draw

Answer 9

CBG (capillary blood gas)
EDTA
other additive
Serum