IGCalcPt

IGCalcPt is a precise gestational age and fetal weight percentile calculator for healthcare professionals, built around growth charts specific to the Portuguese population and recommended by the Portuguese Society of Maternal-Fetal Medicine.

KEY FEATURES

Accurate gestational age calculation:
• Multiple methods: LMP, conception date, embryo transfer (day 2–5), estimated due date
• Automatic conversion between dates and gestational ages
• Interactive calculator for any date
• Before a patient's dating is changed, shows today's GA by the stored dating and by the new one
• Correct handling of time zones and leap years

Portuguese fetal percentiles:
• Growth charts validated for the Portuguese population
• Percentiles by sex (male, female, both), with one decimal below P10 and above P90
• Twins and triplets: each fetus with its own reference table, and weight discordance flagged from 20%
• Interactive fetal growth charts with zoom
• Visual comparison with previous measurements

Patient management:
• Profiles with clinical notes
• Full measurement and percentile history; saved weights can be corrected
• Saved weights follow a corrected dating and the fetal sex
• Close a pregnancy and start the next one on the same record
• Undo after deleting a patient, a weight or a pregnancy
• Quick search by name or ID
• JSON backup and restore
• PDF report with chart and measurements, dated, with the GA on the day

Specialised calculators:
• CRL (crown-rump length): GA at 5–14 weeks (Robinson & Fleming)
• Fetal biometry: estimated weight by Hadlock (BPD, HC, AC, FL)
• Automatic integration between calculators

Accessibility and privacy:
• Dark mode and a dedicated high-visibility mode
• Interface in Portuguese, English and French
• Fully offline: data are stored on the device and are not sent to the developer
• The device's own backup may include the data (on Android, it can be switched off in the app's Settings)
• No ads, no tracking, no data collection

SCIENTIFIC BASIS
Based on the doctoral research of Dr. Ricardo Santos using Portuguese population data:
Sousa-Santos RF, Miguelote RF, Cruz-Correia RJ, Santos CC, Bernardes JFMAL. Development of a birthweight standard and comparison with currently used standards. Eur J Obstet Gynecol Reprod Biol 2016;206:184-193.

WHO IS IT FOR
Obstetricians, gynaecologists, maternal-fetal medicine specialists, sonographers, specialised nurses and residents.

MEDICAL DISCLAIMER
This application is intended for qualified healthcare professionals. Calculators and percentiles are decision-support tools and do not replace clinical judgement.

Recent changes:
What's new:
• Twins and triplets, with weight discordance flagged from 20%
• Close a pregnancy and start the next one on the same record
• Saved weights follow a corrected dating and the fetal sex
• Correct saved weights; undo after deleting
• Compact PDF report, as a rule one page per fetus, with the GA on the day
• Pinch to zoom the growth chart
• Percentiles with one decimal below P10 and above P90
• Many fixes