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 = [UA crea x UA flow (mL/min)] / plasma CREA

1) UA flow rate = volume mL / hrs x 60 min

1800 mL / 1440 min = 1.25 mL/min

2) Crea clearance = 100 × 1.25 / 1.5 = ~83.3