Equations

Question 1

Equation for moles

Answer 1

Moles = g/gmw

Question 2

Equation for molarity

Answer 2

Molarity = (g/gmw)/L

Question 3

Equation for normality

Answer 3

N = (G/(gmw/v))/L

Question 4

Finding the molarity of a normal solution

Answer 4

N = (v)(M)

Question 5

Equation for LDL

Answer 5

LDL = total chol - (HDL + (trig/5))

Question 6

Equation for lipid ratio

Answer 6

Lipid ratio = total chol/HDL

Question 7

Equation for creatinine

Example:
urine creatinine is 95mg/dL
Total volume is 1500mL

Answer 7

Convert to like units and cross multiply

95mg 1dL
1dL 100mL = .95mg/mL

.95mg Mg
1mL 1500mL = 1425mg

Question 8

Equation for GFR

Answer 8

UV/S (hr)(60)

Question 9

Equation for corrected GFR based on patients actual height and weight.

Answer 9

GFR x (1.73/BSA)

Question 10

Equation for calculated osmolality

Answer 10

1.86(Na) + GLU/18 + BUN/2.8

Question 11

Equation for osmol gap

Answer 11

Osmol gap= measured osmo - calculated osmo

Question 12

Equation for anion gap

Answer 12

Anion gap =

Na + K) - (Cl + HCO3

Question 13

Equation for MCV

Answer 13

MCV (fl) = Hct(%) x 10/RBC

Question 14

Equation for MCH

Answer 14

MCH(pg) = Hgb(g/dL) x 10/RBC

Question 15

Equation of MCHC

Answer 15

MCHC (%) =

Hgb(g/dL) x 100/Hct(%)

Question 16

Equation for WBC

Answer 16

WBC/mm3 = WBC counted/# squares used x 10 x dilution

Question 17

Equation for RBC

Answer 17

RBC/mm3 = RBC counted/#squares used x 250 x dilution

Question 18

Equation if the number is squares used isn’t the same on both sides

Answer 18

Cells counted/# squares used on one side + cells counted/# squares used on other side and then multiply answer by the volume correction for WBC or RBC then multiply by the dilution factor.