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8 calculators
Laboratory value interpretation tools for lipid panels, electrolyte abnormalities, and protein ratio assessment. Calculators include the Friedewald LDL estimation, non-HDL cholesterol, total cholesterol/HDL ratio, ApoB/ApoA1 ratio, and the atherogenic index of plasma for cardiovascular risk refinement. Corrected calcium and corrected magnesium account for albumin-bound fractions that can mask true abnormalities. The albumin-to-globulin ratio supports liver and kidney disease evaluation. These tools help translate raw laboratory numbers into clinically meaningful interpretations, but they all depend on accurate fasting status, specimen handling, and knowledge of interfering substances (e.g., Friedewald is unreliable when triglycerides exceed 400 mg/dL).
Every tool in this domain is linked below, each with its own formula, inputs, and interpretation notes. Starting from the clinical area instead of the subject? The same calculators are grouped on the specialties pages, the full alphabetical list collects everything in one place, and the comparison tool lines up three tools side by side.
Calculates corrected total serum calcium adjusted for hypoalbuminemia. In hypoalbuminemia, measured total calcium is falsely low because less calcium is protein-bound; this correction estimates the physiologically active total calcium.
Internal MedicineCalculates the total cholesterol to HDL ratio (TC/HDL), a lipid-based cardiovascular risk indicator that compares total cholesterol with the protective HDL fraction.
Internal MedicineCalculates the atherogenic index of plasma (AIP), a logarithmically transformed ratio of triglycerides to HDL cholesterol that reflects the balance of atherogenic and protective lipoproteins.
Internal MedicineCalculates the apolipoprotein B to apolipoprotein A1 ratio (ApoB:ApoA1), an index of the balance between atherogenic (ApoB) and anti-atherogenic (ApoA1) lipoproteins used in cardiovascular risk assessment.
Internal MedicineEstimates low-density lipoprotein cholesterol (LDL-C) from a standard fasting lipid panel using the Friedewald equation: LDL = total cholesterol − HDL − (triglycerides / 5). Used for cardiovascular risk assessment and lipid-lowering treatment targets. Not valid when triglycerides are ≥ 400 mg/dL.
Internal MedicineCalculates non-HDL cholesterol (total cholesterol minus HDL cholesterol). Non-HDL captures all atherogenic apolipoprotein B-containing lipoproteins, including LDL, VLDL, IDL, and remnants, and is a secondary lipid treatment target per ATP III guidelines.
Internal MedicineCalculates the albumin to globulin ratio from serum albumin and total protein (A/G ratio = albumin / (total protein − albumin)). The ratio is used as a screening aid in the evaluation of liver disease, nephrotic syndrome, and monoclonal gammopathies, alongside the absolute albumin and globulin values.
Internal MedicineAdjusts measured serum magnesium for hypoalbuminemia. When serum albumin is low, measured total magnesium is falsely reduced because less magnesium is bound to proteins. This correction estimates the physiologically relevant magnesium level.
Internal Medicine