Select a vessel and GA to see typical PI/RI/PSV ranges and whether your value is below, within, or above the band. Vessel Umbilical artery Middle cerebral artery Choose the vessel, then pick a Doppler measure below. Measure Pulsatility index (PI)Resistance index (RI)Peak systolic velocity (PSV) Gestational age — weeks Days (0–6) Your value (unit depends … Read more

Enter two values (EFW g, AC mm, or FL mm) to see the percent size difference between twins and a plain-language band. Measurement type EFW (g) AC (mm) FL (mm) Discordance uses the same formula for all three: (larger − smaller) ÷ larger. Twin A Twin B Calculate Clear Copy summary Discordance — — — … Read more

Enter GA, LMP, or EDD to see personalized date windows for NT, NIPT, the anatomy scan, gestational diabetes screening, and Tdap. Reference date (today or visit date) We calculate your schedule relative to this date. How do you want to enter progress? By GA (w+d) By LMP date By EDD date Weeks Days (0–6) LMP … Read more

Use your ultrasound’s estimated fetal weight (EFW) and gestational age to see the percentile and a typical range using the published Hadlock 1991 fetal-growth standard. Gestational age (weeks + days) Supported range: 14–40 weeks. Estimated fetal weight (EFW) in grams From your ultrasound report. Lookup percentile — — — Percentile uses the Hadlock 1991 fetal-growth … Read more

Use a single femur length (FL) measurement to estimate gestational age (weeks+days) and see where that length sits by percentile for this stage. Femur length (FL) in mm Enter the measured femur length from ultrasound. Known GA (optional) If provided, we compute percentile at this GA. If left empty, we estimate GA from FL. Calculate … Read more

Enter a biparietal diameter (BPD) in millimetres. The tool estimates gestational age, shows the percentile, and lists a typical BPD range for that age. Biparietal diameter (BPD) in millimeters Copy the BPD measurement in millimeters from your ultrasound report. Known gestational age in weeks (optional) Enter the age on your report for the percentile comparison. … Read more

Enter weeks+days or DPO to see a typical hCG band for that stage. Add your result to compare against the band. How do you want to enter progress? By weeks + days By DPO (ovulation) GA = gestational age from last period. DPO = days past ovulation (we add 14 days to map to GA). … Read more

Enter two quantitative hCG blood-test results and their collection times. See the change between the tests, the equivalent 48-hour change, and an estimated doubling or halving time. First blood test Draw 1 date and time Use the collection time shown by your lab. Draw 1 hCG Enter the quantitative serum result in mIU/mL or IU/L. … Read more

Enter age, height and weight, select pregnancy or postpartum, and add optional risk factors. The calculator totals VTE (venous thromboembolism) risk points and shows a simple risk band. Use with a clinician. Patient’s current situation Patient is pregnant Patient has given birth (postpartum) Height and weight Imperial (ft, in, lb) Metric (cm, kg) Height (ft … Read more

Enter age, BMI or height and weight, ethnicity, prior vaginal birth, any vaginal birth since the caesarean, and whether the prior indication is recurrent. The result shows a VBAC probability and a simple score for counselling. Age (years) Enter your age in years. The starting value is 30. Ethnicity (optional) African American Hispanic White / … Read more