OpiCalc

Favorites Specialties Drugs Guidelines Most Used

All Specialties

Favorites Specialties Drugs Guidelines Most Used

Faves Specs Drugs Guides Top

APGAR Score Assisted Delivery (FIGO)BPP (Manning Score)Bishop Score CARPREG II Cardiac Risk Cervical Cancer Staging Contraceptive Pearl Index Doppler Matrix (UA/MCA)EFW (Hadlock)Endometrial Staging Endometrial Thickness FGR Criteria (Consensus)FSFI (Sexual Function)Ferriman-Gallwey Score Fetal Anemia (MCA PSV)GDM Diagnostic Criteria GPA History Indicator Gail Model Breast Risk Gestational Dating (LMP)HIV PMTCT Protocol IOTA Simple Rules IVF Due Date & AMH Iron Deficit (Ganzoni)Labour Progress (WHO)Maternal Sepsis (qSOFA)O-RADS Classification Ovarian Cancer Staging PAS Hemorrhage Risk PPH Protocol (FIGO)Preeclampsia (ACOG)Rho(D) Dose (K-B)Rotterdam PCOS Criteria Syphilis Management TORCH Framework VBAC Success Probability Vulvar Cancer Staging Weight Gain (IOM)mWHO Cardiac Risk

OpiCalc

Easy, fast, and private medical tools for clinicians. Always free.

No Login Required

Ready for the Bedside

Resources

About Us Editorial Policy Medical Disclaimer Privacy Policy Terms of Use Cookie Policy

Support

Clinical Notice:OpiCalc is not a substitute for professional clinical judgment. Always verify dosages and guidelines.

OpiCalc © 2018-2026

•

All Rights Reserved

In Recent Clinical News

Scanning Medical Journals

No new significant updates or guidelines matching this topic were found today. We will check again soon.

PAS Hemorrhage Risk

PAS Spectrum Risk

Placenta Accreta / Increta / Percreta Assessment

High-Yield Ultrasound Markers

Prior Cesarean Section (Weighted Rank 1)
Placenta Previa (Co-existing)
Multiple Placental Lacunae
Loss of retroplacental clear zone
Abnormal uterine-bladder interface
Exophytic mass (Extra-uterine extension)

Massive Transfusion (MTP)

WHO/FIGO Aligned Protocol: 1:1:1 Ratio (RBC : FFP : Platelets).

Hb Target> 7g/dL

Plt Target> 50k

Fib Target> 200mg/dL

Critical Bleeding RateExceeding 150mL / Minute

Guidelines & Evidence

Verified

Last Review: 2026

When to Use

Primary Clinical Uses

Classifying the profound morbidity risk in patients presenting with placenta previa and prior cesarean sections.

Directing surgical planning (e.g., scheduled cesarean hysterectomy, massive transfusion protocols).

Pre-operative counseling regarding the extreme risk of catastrophic pelvic hemorrhage.

What is PAS?

Placenta Accreta Spectrum (PAS) involves abnormal trophoblast invasion into the myometrium. It is categorized into Accreta (attaches directly to myometrium), Increta (invades into myometrium), and Percreta (penetrates through serosa/bladder).

Last Comprehensive Review: 2026