Lipid ratios, creatinine clearance / GFR

Question 1

What is the equation to calculate the LDL?

Answer 1

LDL = total cholesterol - [HDL + (triglycerides divided by 5)]

Question 2

What is the equation to calculate the Lipid ratio?

Answer 2

Lipid ratio = total cholesterol divided by HDL

Question 3

What is the formula for finding the clearance of creatinine (or any other analyte)?

Answer 3

UV / S
U = urine analyte concentration in mg/dL
V = volume of urine in mL/minute
S = serum analyte concentration in mg/dL

Question 4

The patient’s height and weight is needed to calculate the GFR for the clearance tests. If the patient doesn’t have “the average body size”, we have to correct the body surface for abnormal BSA. What is that formula?

Answer 4

GFR = (UV / S) x (1.73 / BSA of patient)