Calculations Practice

The automated hematology analyzer reports a WBC of 30 × 109 /L. The technologist counts 115 NRBCs per 100 WBCs while performing the differential. What is the corrected WBC?

14 × 10⁹/L

Calculate the absolute lymphocyte count if the total WBC is 10 × 109 /L and there are 70% lymphocytes

Absolute count = 7 × 10⁹ /L

What should the HGB be if the RBC is 4.1 × 10¹²/L?

11.8–12.8 g/dL

What should the HCT be if HGB is 12.3 g/dL?

33.9%–39.9%

Calculate the creatinine clearance (mL/min)

• Serum creatinine: 1.5 mg/dL

• Urine creatinine: 100 mg/dL

• Urine volume: 1.8 L / 24 hours

Crea clearance = ~83.3

If a patient has:

• Total cholesterol = 220 mg/dL

• HDL = 50 mg/dL

• Triglycerides = 150 mg/dL

What is the LDL using the Friedewald equation?

LDL = Total Chol - [HDL + (Trig/5)]
LDL = 220 - [50 + (150/5)]
LDL = 140 mg/dL