Lab medicine

Question 1

Indications for ABG

Answer 1

Determine ventilation, acid/base, o2 carrying capacity

More accurate and direct measure

Question 2

Arterial pH

Answer 2

7.38 - 7.44

Question 3

PaO2

Answer 3

95-100 mm Hg

<60 dangerous

Question 4

PaCO2

Answer 4

35-40 mm Hg. Increased = inadequate pH

Question 5

Venous total CO2

Answer 5

Measure of bicarb

24-30 mmol/l

Question 6

Arterial plasma bicarb

Answer 6

19-24 mEq/L

Caculated from pH and PaCO2

Question 7

Puls ox

Answer 7

> 94%
oxyhemoglobin saturation
Large amounts of carbon monoxide falsely elevate

Question 8

Cold agglutinins

Answer 8

Mycoplasma pneumonia- blood agglutinates when cold

Question 9

Mycoplasma serology

Answer 9

Evaluate presence of abs to fungi

Question 10

Acid fast

Answer 10

M. tuberculosis

Question 11

Interferon-gamma release assay

Answer 11

Tb- indicated when have BCG vaccine or won’t comply to TST

Question 12

Fibrin degredation

Answer 12

DIC or use of thrombolytic drugs

Question 13

Fibrinogen

Answer 13

Decreased synthesis of clot or diffuse activation of clotting

Question 14

D-dimer

Answer 14

Elecated in DVT, PE, VTE- indicates presence of fibrin clot

Question 15

PT/INR

Answer 15

Extrinsic & intrinsic pathway

monitor warfarin therapy

Question 16

aPTT

Answer 16

Intrinsic therapy, measure heparin