Amniotic Fluid Index Reference
Where an AFI report value sits among the standard bands — translation for a number nobody explains at the scan.
Fluid volume rises to ~34 weeks then declines naturally toward term — a 'lowish' number at 39 weeks means something different than at 28. Values outside the typical band lead to monitoring or further scans, and management depends entirely on the full clinical picture your team sees; this reference exists to decode the report line, not to interpret it for you.
Formula
Reference aid for healthcare professionals only. Every result must be independently verified before clinical use. Never use this tool for self-medication or to replace clinical judgement.
Where an AFI report value sits among the standard bands — translation for a number nobody explains at the scan. The Amniotic Fluid Index Reference is a free, private afi normal range tool — every result computes instantly in your browser with no sign-up and no data upload.
About Amniotic Fluid Index Reference
Fluid volume rises to ~34 weeks then declines naturally toward term — a 'lowish' number at 39 weeks means something different than at 28. It applies AFI = sum of deepest vertical pockets in 4 uterine quadrants. Use the Amniotic Fluid Index Reference to get an instant, clearly-explained result with the working shown step by step — free, private and with the source method cited.
How to use Amniotic Fluid Index Reference
- 1Enter your details in the Amniotic Fluid Index Reference input fields above.
- 2The result updates instantly with the working and reference bands shown.
- 3Adjust any value to explore how it changes the outcome — it's free and unlimited.
Why use Amniotic Fluid Index Reference?
- ✓Instant afi normal range result that recomputes as you type — no waiting, no page reloads
- ✓100% client-side: your health data never leaves your browser
- ✓Shows the actual formula and your numbers substituted in, so you can see exactly how the result is reached
- ✓Based on published, citable sources (Phelan JP et al., J Reprod Med 1987 — AFI technique)
- ✓Free forever with no sign-up, account or app install
Frequently asked questions
How does the Amniotic Fluid Index Reference work?+
Fluid volume rises to ~34 weeks then declines naturally toward term — a 'lowish' number at 39 weeks means something different than at 28. The calculation uses the formula: AFI = sum of deepest vertical pockets in 4 uterine quadrants. Everything runs instantly in your browser as you type — your inputs are never uploaded.
Is the Amniotic Fluid Index Reference accurate, and what is it based on?+
The method is traceable to authoritative sources, including Phelan JP et al., J Reprod Med 1987 — AFI technique; Nabhan AF & Abdelmoula YA, Cochrane 2008 — AFI vs deepest pocket. Results are estimates — individual variation always applies, so treat the output as a well-grounded starting point.
Is the Amniotic Fluid Index Reference free and private?+
Yes. It's completely free with no sign-up, and all computation happens locally in your browser, so none of your health data ever leaves your device.
Can I use this for medical decisions?+
This is a reference aid for healthcare professionals and must be independently verified. It is not for self-diagnosis or self-medication.
What can I use the Amniotic Fluid Index Reference for?+
It's commonly used for afi normal range, amniotic fluid index, oligohydramnios. Where an AFI report value sits among the standard bands — translation for a number nobody explains at the scan.
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