Editorial & Sourcing Policy

BestMedCal's calculators and health tools are used by students, caregivers and healthcare professionals, so every formula, constant, reference range and dosing rule on the site comes from a published primary source. We draw on:

• Clinical guidelines and formulariesNICE, BNF for Children, SIGN, the American Academy of Pediatrics, ANZCA and specialist societies.
• Public-health and government bodiesThe World Health Organization, CDC, the NIH Office of Dietary Supplements, the NHS and GOV.UK.
• Regulators and product labelingU.S. FDA guidance and FDA-approved prescribing information.
• Measurement and nutrition standardsNIST definitions of mass and volume units, and USDA FoodData Central.
• Peer-reviewed evidenceJournal articles, Cochrane reviews and National Academies reports.

Other calculator websites, forums and unsourced summaries are never used as the source of a value, formula or dose. Each page names the specific sources it relies on, so any reader can check our figures against the original.

1. 01Find the primary sourceWe take each formula, reference range or dosing rule from the guideline, label or standard that defines it.
2. 02Build and testWe implement the calculation and compare its results with worked examples from that source, or with values calculated by hand, before the tool is published.
3. 03Cite it on the pageThe sources a page relies on are listed in its References section, with a link wherever a public copy exists.
4. 04Re-check and date itWe re-check a page when one of its sources is updated or a reader reports a possible error. When we do, the page shows the date of that check.

Articles are written and published by the BestMedCal editorial team. When a page names an author or a clinical reviewer, that person actually wrote or reviewed it, and the credentials shown are ones that can be verified.

Where no clinician has reviewed a page, we do not suggest otherwise: the page is credited to BestMedCal as its publisher, and its trust rests on the cited sources, which you can check for yourself.

Published

The day the article first went live.

Updated

The day its content last changed.

Sources checked

The day our editorial team last compared the page's values and formulas with its cited sources. Shown only when such a check has taken place.

Reviewed by

Shown only when a named person reviewed the page, together with the date of their review.

We never move a date forward unless the work it describes has been done.

Our tools are calculation and educational aids. They carry out the arithmetic of a published method accurately, but they do not choose or approve a dose, diagnose a condition or replace professional judgment.

Every page carries a medical disclaimer. Always check a clinical decision against the current product label and with a qualified healthcare professional. Read our full medical disclaimer.

If you believe a value, formula or statement on BestMedCal is wrong, email support@bestmedcal.com with the page address and, if you can, the source that shows the correct figure.

We check every report against the primary source. When we confirm an error, we correct the page and update its dates to show when the change was made.