Calculations

Question 1

Beer’s Law

Answer 1

A = abc

where:
A = absorbance
a = molar absorptivity (a constant)
b = length of light path (usually 1 cm)
c = concentration (g/L)

Question 2

A/G ratio means…

And calculate total protein

Answer 2

Albumin/Globulin

globulins = total protein - albumin

Question 3

Formula to calculate Indirect, Direct, or Total Bilirubin

Answer 3

Total bilirubin = indirect bilirubin + direct bilirubin

Question 4

Creatinine Clearance (uncorrected and corrected)

Answer 4

Uncorrected: U * V / S * Collection time or U/S * V
Corrected: U * V / S * Collection time * 1.73/A or U/S * V * 1.73/A

Where:
U = Urine creatinine (mg/dL)
V = Urine volume excreted in 24 hours (mL)
S = Serum creatinine
Collection time = minutes
A = Average body surface area (m^2)

Ideally, collect serum creatinine at midpoint of 24-hr urine collection

Question 5

% Transferrin Saturation

Answer 5

Transferrin Saturation (%) = (Total iron / TIBC) x 100

Question 6

Friedewald Equation (how to calculate LDL)

This equation is invalid at what value triglycerides?

Answer 6

LDL = Total cholesterol - HDL - VLDL

VLDL = Triglycerides/5

*NOT applicable if Trilycerides is >400 mg/dL (over 2x healthy max)

Question 7

osmolality

Answer 7

osmolality = 2Na + Glucose/2 + BUN/3

Question 8

Anion gap

Answer 8

Cations - anions

(Na + K) - (Cl + HCO3)

Question 9

Coefficient of Variation

Answer 9

CV % = SD / mean x 100

Question 10

Standard Deviation

Answer 10

Look at paper lol