Category
Clinical Laboratory
Common bedside lab derivations, corrected values, and acid–base tools.
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AKI Severity (RIFLE creatinine)
Acute kidney injury staging helper.
Creatinine-based
Albumin/Globulin Ratio
Serum protein pattern index.
A/G ratio
Anion Gap
Serum anion gap.
Na − (Cl + HCO₃)
Calcium–Phosphorus Product
CKD-MBD risk marker.
Ca × Phos
Calculated Serum Osmolality
Estimated serum osmolality.
2×Na + glucose/18
Corrected Calcium
Albumin-adjusted total calcium.
Albumin correction
Delta Gap
High anion gap metabolic acidosis helper.
Δ gap
Ionized Calcium Estimate
Estimated ionized calcium when direct measurement is unavailable.
From total calcium and albumin
LDL (when TG elevated)
Approximate LDL when triglycerides are high (educational).
Non-HDL based estimate
LDL Cholesterol (Friedewald)
LDL-C when triglycerides are acceptable.
LDL estimate
Serum Osmolality (calculated)
Estimated serum osmolality from routine chemistry.
2×Na + glucose/18 + BUN/2.8
Transferrin Saturation
Iron studies index.
Fe/TIBC