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HEMATOLOGY 1 > BLOOD COLLECTION > Flashcards

BLOOD COLLECTION Flashcards

1
Q

Most common site for venipuncture

A

antecubital fossa (median, cephalic, basilic)

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2
Q

Cleansing motion for site

A

friction of back and forth

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3
Q

Angle between skin and needle during venipuncture

A

<30 degrees

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4
Q

Maximum tourniquet application time

A

<1 minute (60 seconds)

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5
Q

Cause of specimen hemolysis

A

prolonged tourniquet, moisture/contam in blood tube, needles with small bores, excessive agitation, frothing

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6
Q

Effect of prolonged tourniquet application

A

false shortening of coagulation test due to stasis, FVIII, and VWF accumulation

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7
Q

Distance of tourniquet from puncture site

A

3-4 inches (7.5-10 cm)

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8
Q

Most common needle size for adult venipuncture

A

21 G; 1-inch length

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9
Q

Maximum number of punctures allowed

A

2

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10
Q

When to replace sharp container

A

no more than three-quarters full

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11
Q

Most common cause of needle puncture injury

A

improper disposal

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12
Q

Usual EDTA anticoagulant component

A

Dipotassium (K2)

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13
Q

CBC is also called

A

hemogram

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14
Q

Optimal EDTA anticoagulant concentration

A

1.5 mg/mL of blood

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15
Q

Time to analyze CBC specimen

A

6 hours (room temp); 24 hours (refrigerated)

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16
Q

Time to prepare blood smear

A

within 3 hours

17
Q

EDTA prevents

A

platelet aggregation

18
Q

Effect of EDTA on platelets in 1 hour

A

20% increase in size

19
Q

Excessive EDTA causes

A

decreased HCT, ESR; WBC degeneration; increased MCHC

20
Q

RBC parameters

A

RBC count, Hgb, Hct, RBC indices, RDW, Retic count

21
Q

WBC parameters

A

WBC count, neut, lymph, mono, eo, baso (relative and absolute)

22
Q

Platelet parameters

A

Platelet count, Mean platelet volume

23
Q

Definition of chelation

A

ring-shaped molecular complex binding metal ions

24
Q

Delta check definition

A

current test result compared to previous test result for same patient

HEMATOLOGY 1 (27 decks)

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