Lab Exam 1 - Must-Know Values and Formulas

o₂ carrying capacity

hb (g/dL) x 1.34 = mL of o₂ / 100 mL blood

raw hematocrit

(total rbc volume/ total blood volume) x 100

true hematocrit

raw hct x 0.96

lambert-beer law

A1/C1=A2/C2

MCV (average rbc size)

80-100 fL

MCH (average hb inside a single rbc)

27-31/32 pg

MCHC (average hb concentration of rbc)

32-36%

RDW (rbc variation)

11.5-14.5%

platelets

150-400 × 10³/ uL

WBC

about 4.5-11 × 10³/ uL

Hb

male 15-16 g/dL; female 13-14 g/dL

Hct

male 42-52%; female 37-47%

PT (clotting time)

11-13 sec; extrinsic + common

INR

0.8-1.2 normally; warfarin monitoring

aPTT

intrinsic + common; heparin monitoring

vitamin k factors

ii, vii, ix, x

universal rbc donor

O-

universal rbc recipient

AB+

rhoGAM (injection of Rh immunoglobulin)

28 weeks + within 72 hours after Rh+ delivery

hypertonic

water leaves cell; shrink/ crenate

hypotonic

water enters cell; swell, possibly lyse

isotonic

no net volume change

NaCl

mw = 58.44; dissociation factor 2

glucose

mw = 180; dissociation factor 1

pepsin optimum

pH 2 at 37 C

PTU

blocks thyroid hormone → TSH rises → goiter