Which Hadlock formula is used for EFW in India?

The Hadlock 1985 formula is standard in Indian practice. 4-parameter (BPD+HC+AC+FL) is preferred; 3-parameter (BPD+AC+FL) used when HC is unavailable. Results have ±15% variability.

What is a good Bishop score for induction of labour?

Score ≥9 is highly favourable — direct oxytocin induction appropriate. Score 6–8 is favourable. Below 6 requires cervical ripening with prostaglandins or Foley balloon.

What is the DIPSI protocol for GDM in India?

75g oral glucose (non-fasting). Blood glucose at 2 hours ≥140 mg/dL = GDM. FOGSI recommends universal screening at first ANC visit and at 24–28 weeks for all Indian women.

What are the VBAC criteria per FOGSI?

Single previous low transverse LSCS, cephalic presentation, scar thickness ≥3.5mm, no recurring indication, interpregnancy interval ≥18 months. Requires emergency CS access.

What is a normal Apgar score?

7–10 is normal (routine care). 4–6 is moderately depressed (oxygen + stimulation). 0–3 is severely depressed (immediate resuscitation — PPV).

What causes postpartum haemorrhage?

PPH is most commonly caused by uterine atony (4 Ts — Tone, Trauma, Tissue, Thrombin). Defined as blood loss ≥500ml after vaginal delivery or ≥1000ml after CS.

ObsCalc India | Obstetric Calculator | Gestational Age, Bishop Score, Apgar, EFW, GDM, VBAC

← All Calculators

Gestational Age EFW Hadlock Bishop Score Apgar Score GDM Dates VBAC PPH Risk

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Gestational Age Calculators

GA by LMP · GA by Scan · GA on Any Date · LMP from EDD

4 tools ▾

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Gestational Age by LMP

Naegele's Rule — EDD = LMP + 280 days, adjusted for cycle length.

Last Menstrual Period (LMP)

Cycle Length (days)

Gestational Age by Ultrasound Scan

Back-calculates EDD from scan date and GA at scan. Most accurate in first trimester.

Scan Date

GA at Scan — Weeks

GA at Scan — Days

Gestational Age on Any Given Date

Find exact GA on a specific date — for operation notes, admission documents or referral letters.

LMP Date

Calculate GA on

Cycle Length

LMP from EDD (Reverse Calculator)

Calculate LMP when only the estimated due date is known.

Estimated Due Date (EDD)

Cycle Length

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Fetal Assessment

Expected Fetal Weight (Hadlock) · Apgar Score

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Expected Fetal Weight — Hadlock Formula

Hadlock 1985 — standard in Indian practice. BPD+HC+AC+FL (4-param) or BPD+AC+FL (3-param if HC unavailable). Measurements in mm.

BPD (mm)

HC (mm, optional)

AC (mm)

FL (mm)

GA at Scan (weeks)

💡 HC is optional. If not available, the 3-parameter formula (BPD+AC+FL) will be used automatically. All EFW results have ±15% variability.

Apgar Score Calculator

Score all 5 criteria (A-P-G-A-R) from 0–2. Used at 1 minute and 5 minutes after birth.

A — Appearance (Colour)

P — Pulse (Heart Rate)

G — Grimace (Reflex)

A — Activity (Muscle Tone)

R — Respiration

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Obstetric Scoring

Bishop Score · VBAC Eligibility · PPH Risk Assessment

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Bishop Score — Cervical Assessment for Induction

Assesses cervical favourability before induction of labour. Score all 5 parameters.

Dilation (cm)

Effacement (%)

Station (fetal head)

Consistency

Cervical Position

VBAC Eligibility Checklist

TOLAC/VBAC assessment per FOGSI and ACOG guidelines. Answer all 8 questions.

Uterine scar type

Number of previous CS

Previous vaginal delivery

Indication of previous CS

Interpregnancy interval

Current presentation

Estimated fetal weight

Scar thickness on USS

PPH Risk Assessment

Select all risk factors present. Based on RCOG and FOGSI guidelines.

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Screening

GDM Screening Dates — DIPSI / FOGSI Protocol

1 tool ▾

GDM Screening Dates — DIPSI / FOGSI

Calculate gestational diabetes screening dates. High-risk women receive early and more frequent screening.

LMP Date

Risk Factors — select all that apply

ObsCalc India — Free Obstetric Calculator Suite for Doctors

This free obstetric calculator suite covers all common bedside calculations for Indian obstetricians — gestational age, fetal weight, cervical scoring, newborn assessment, GDM screening, VBAC eligibility and PPH risk. All calculators follow FOGSI, ACOG, RCOG and WHO guidelines.

Gestational Age Calculators

GA by LMP: Naegele's Rule — EDD = LMP + 280 days adjusted for cycle length. Shows current GA, trimester and EDD.

GA by Scan: Back-calculates EDD from ultrasound GA. Most accurate in the first trimester using CRL.

GA on Any Given Date: Calculates the exact gestational age on any specified date — for operation notes and discharge summaries.

LMP from EDD: Reverse calculator — enter a known EDD to find the equivalent LMP and approximate conception date.

Fetal Assessment

Expected Fetal Weight (Hadlock): Hadlock 1985 formula — standard in Indian practice. 4-parameter (BPD+HC+AC+FL) preferred, 3-parameter (BPD+AC+FL) used when HC unavailable. Includes ±15% range and approximate SGA/AGA/LGA classification.

Apgar Score: Calculates score from 5 criteria — Appearance, Pulse, Grimace, Activity, Respiration. 7–10 normal. 4–6 requires intervention. 0–3 requires immediate resuscitation.

Obstetric Scoring

Bishop Score: Assesses cervical favourability for induction of labour — dilation, effacement, station, consistency and position. Score ≥9 favourable for direct oxytocin. Score <6 requires ripening.

VBAC Eligibility: 8-point checklist per FOGSI/ACOG — scar type, number of CS, presentation, fetal weight, scar thickness, interval, previous SVD and CS indication.

PPH Risk: 15 weighted risk factors giving Low/Moderate/High/Very High risk with specific management protocols per RCOG/FOGSI.

GDM Screening — DIPSI Protocol

DIPSI recommends 75g oral glucose (non-fasting). Blood glucose ≥140 mg/dL at 2 hours = GDM. FOGSI recommends universal screening at first ANC and 24–28 weeks. High-risk women get an additional screen at 32–34 weeks.

Frequently Asked Questions

How is gestational age calculated from LMP?

Using Naegele's Rule — add 280 days to the LMP assuming 28-day cycles. Adjust by adding or subtracting the difference from 28 days for non-standard cycles.

Which Hadlock formula is used for EFW?

Hadlock 1985 is standard in India. The 4-parameter formula (BPD+HC+AC+FL) is most accurate. Results have ±15% variability and should be combined with clinical findings.

What is a good Bishop score for induction?

Score ≥9 highly favourable — direct oxytocin appropriate. Score 6–8 favourable. Score <6 requires cervical ripening.

What is DIPSI GDM screening?

75g glucose non-fasting test — blood glucose ≥140 mg/dL at 2 hours is diagnostic. Recommended universally for all Indian pregnant women by FOGSI.

What are VBAC criteria in India?

Single low transverse LSCS, cephalic presentation, scar ≥3.5mm, no recurring indication, interval ≥18 months. Requires emergency CS access and continuous CTG.

⚕️ For clinical use by qualified healthcare professionals only. Results are clinical aids — always apply clinical judgement and refer to current FOGSI/ACOG/WHO guidelines for individual patient decisions.