Lab Calculators — BloodWorks Academy

🫘 Renal Function

🫘

eGFR (CKD-EPI)

Estimated Glomerular Filtration Rate using CKD-EPI 2021 equation

Serum Creatinine mg/dL

Age years

Sex

CKD-EPI 2021: 142 × min(Scr/κ,1)^α × max(Scr/κ,1)^−1.200 × 0.9938^Age (×1.012 if female)

🫘

Creatinine Clearance

Cockcroft-Gault equation for kidney function estimation

Serum Creatinine mg/dL

Age years

Weight kg

Sex

CrCl = [(140−Age) × Weight] / (72 × Scr) × 0.85 if female

🫀 Lipid Panel

🫀

LDL Cholesterol

Friedewald equation (requires fasting lipid panel)

Total Cholesterol mg/dL

HDL Cholesterol mg/dL

Triglycerides mg/dL

LDL = Total Cholesterol − HDL − (Triglycerides / 5) — Invalid if TG > 400 mg/dL

🫀

Non-HDL Cholesterol

All atherogenic lipoproteins combined

Total Cholesterol mg/dL

HDL Cholesterol mg/dL

Non-HDL = Total Cholesterol − HDL

🩸 Hematology

🩸

Corrected WBC Count

Adjust WBC for nucleated red blood cells (nRBCs)

Uncorrected WBC × 10³/µL

nRBCs per 100 WBCs nRBCs/100 WBC

Corrected WBC = (Uncorrected WBC × 100) / (100 + nRBCs)

🩸

Absolute Neutrophil Count

ANC for neutropenia assessment

WBC Count × 10³/µL

Neutrophils (%) %

Bands (%) % (optional)

ANC = WBC × (Neutrophils% + Bands%) / 100

🩸

Corrected Reticulocyte Count

Adjust reticulocyte % for degree of anemia

Reticulocyte % %

Patient Hematocrit %

Normal Hematocrit % (default 45)

CRC = Retic% × (Patient Hct / Normal Hct)

🩸

RBC Indices (MCV, MCH, MCHC)

Calculate red cell indices from CBC parameters

Hemoglobin g/dL

Hematocrit %

RBC Count × 10⁶/µL

MCV = (Hct × 10) / RBC | MCH = Hgb / RBC × 10 | MCHC = Hgb / Hct × 100

⚡ Electrolytes

⚡

Anion Gap

Identify metabolic acidosis etiology

Sodium (Na⁺) mEq/L

Chloride (Cl⁻) mEq/L

Bicarbonate (HCO₃⁻) mEq/L

Anion Gap = Na⁺ − (Cl⁻ + HCO₃⁻) | Normal: 8–12 mEq/L

⚡

Corrected Calcium

Adjust total calcium for albumin level

Total Calcium mg/dL

Albumin g/dL

Corrected Ca = Total Ca + 0.8 × (4 − Albumin) | Normal: 8.5–10.5 mg/dL

⚡

Serum Osmolality

Calculated serum osmolality

Sodium (Na⁺) mEq/L

Glucose mg/dL

BUN mg/dL

Osmolality = 2×Na + (Glucose/18) + (BUN/2.8) | Normal: 275–295 mOsm/kg

⚡

Corrected Sodium

Adjust sodium for hyperglycemia

Measured Sodium mEq/L

Glucose mg/dL

Corrected Na = Measured Na + 1.6 × [(Glucose − 100) / 100]

🫁 Liver / Other

🫁

A/G Ratio

Albumin to Globulin ratio for liver/immune assessment

Albumin g/dL

Total Protein g/dL

Globulin = Total Protein − Albumin | A/G Ratio = Albumin / Globulin | Normal: 1.1–2.5

🩺 Diabetes

🩺

HbA1c → Average Glucose

Convert HbA1c percentage to estimated average glucose

HbA1c %

eAG (mg/dL) = 28.7 × HbA1c − 46.7 | eAG (mmol/L) = 1.59 × HbA1c − 2.59