---
title: Free lab testing tools
type: index
url: "https://www.test-well.com/tools"
---

# Free lab testing tools

> Interactive utilities built on TestWell's reviewed reference catalog and live pricing: reference range lookup, unit conversion, free testosterone calculation and a draw-site finder. Each is also exposed as an MCP tool for AI agents.

- [Reference Range Lookup](https://www.test-well.com/tools/reference-range-lookup): Normal ranges for 130+ blood tests, filtered by sex and age, with units and sources.
- [Lab Unit Converter](https://www.test-well.com/tools/lab-unit-converter): Switch any common blood test between US and SI units, with the exact factor shown.
- [Free Testosterone Calculator](https://www.test-well.com/tools/free-testosterone-calculator): Free and bioavailable T from total T + SHBG + albumin, using the Vermeulen equation.
- [Lab Results Explainer](https://www.test-well.com/tools/lab-results-explainer): Paste your results; each value is flagged against reviewed reference ranges with what high or low can mean.
- [Lab Test Price Checker](https://www.test-well.com/tools/lab-test-price-checker): Quest, Labcorp and TestWell prices for any blood test, with source links and check dates.
- [Analyze My Lab Results with AI](https://www.test-well.com/tools/analyze-my-results): A copy-paste prompt that makes ChatGPT or Claude read your results against reviewed ranges.
- [NLR Calculator](https://www.test-well.com/tools/nlr-calculator): Neutrophils ÷ lymphocytes from your CBC, with the published healthy range.
- [FIB-4 Calculator](https://www.test-well.com/tools/fib-4-calculator): The guideline liver-fibrosis score from age, AST, ALT and platelets, with the 1.3 / 2.67 cut points.
- [HOMA-IR Calculator](https://www.test-well.com/tools/homa-ir-calculator): Glucose × insulin ÷ 405 — the standard insulin-resistance estimate, with unit toggles.
- [TyG Index Calculator](https://www.test-well.com/tools/tyg-index-calculator): ln(TG × glucose ÷ 2) — insulin resistance from numbers already on your lipid panel.
- [A1c to eAG Calculator](https://www.test-well.com/tools/eag-calculator): Turn an A1c into the average glucose it represents, with the ADA categories.
- [Anion Gap Calculator](https://www.test-well.com/tools/anion-gap-calculator): Na − (Cl + HCO₃) from your metabolic panel, with the albumin correction.
- [Biological Age Calculator](https://www.test-well.com/tools/biological-age-calculator): Levine's PhenoAge from a CMP, a CBC with differential and hs-CRP — with each marker's contribution.
- [LH:FSH Ratio Calculator](https://www.test-well.com/tools/lh-fsh-ratio-calculator): LH ÷ FSH from a day 2–4 draw, with what the common patterns mean.
- [Corrected Calcium Calculator](https://www.test-well.com/tools/corrected-calcium-calculator): Albumin-adjusted calcium from a metabolic panel, with the usual, low and high bands.
- [LDL Cholesterol Calculator](https://www.test-well.com/tools/ldl-cholesterol-calculator): LDL from a standard lipid panel, two equations, with non-HDL and the TC:HDL ratio.
- [Triglyceride to HDL Ratio Calculator](https://www.test-well.com/tools/tg-hdl-ratio-calculator): Fasting triglycerides ÷ HDL, with the cut points studies use for insulin resistance.
- [Serum Osmolality Calculator](https://www.test-well.com/tools/serum-osmolality-calculator): 2 × Na + glucose/18 + BUN/2.8, term by term, with the osmolal gap explained.
- [BUN to Creatinine Ratio Calculator](https://www.test-well.com/tools/bun-creatinine-ratio-calculator): BUN ÷ creatinine, with the patterns a low, usual or high ratio suggests.
- [Transferrin Saturation Calculator](https://www.test-well.com/tools/transferrin-saturation-calculator): Iron ÷ TIBC as a percentage, with UIBC and the deficiency and overload thresholds.
- [Lab Location Finder](https://www.test-well.com/find-a-lab): search Quest, Labcorp and BioReference draw sites by ZIP.

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Canonical page: https://www.test-well.com/tools
Machine-readable catalog: https://www.test-well.com/api/catalog.json · MCP server: https://www.test-well.com/mcp · Overview for agents: https://www.test-well.com/llms.txt

Prices are cash-pay, in USD, and include physician authorization; every order adds one flat $6 lab processing fee. Educational content is not a diagnosis — discuss results with a clinician.