Source: https://guthlabs.ai/docs/instrument-workflows/cycle-suite/

instrument cross-check / verified-workflow-definition

# Pregnancy & Cycle Suite

Date chains with dual-dating agreement.

Status: **observed**Lifecycle: **verified-workflow-definition**

## Goal

Date chains with dual-dating agreement.

## Instrument chain

- 01

**[Pregnancy Due Date Calculator](<https://guthlabs.ai/docs/instruments/pregnancy-due-date-calculator/>)**

LMP dating

VERIFIED

- 02

**[Gestational Age / EDD from Ultrasound](<https://guthlabs.ai/docs/instruments/gestational-age-edd-from-ultrasound/>)**

scan dating

VERIFIED

- 03

**[Ovulation & Fertile Window Estimator](<https://guthlabs.ai/docs/instruments/ovulation-fertile-window-estimator/>)**

window

VERIFIED

- 04

**[Menstrual Cycle Length Tracker/Predictor](<https://guthlabs.ai/docs/instruments/menstrual-cycle-length-tracker-predictor/>)**

history

VERIFIED

## Handoffs and cross-checks

LMP-EDD vs scan-EDD compared; cycle history refines ovulation offset.

## PointGuard stance

When LMP and ultrasound dating disagree beyond the gestational-age-dependent threshold, the scan wins — say so explicitly.

## Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

- `INSTRUMENT_COMBOS.json`

- `VERIFIED_LEDGER.json`