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Calcimator

Colonoscopy Prep Calculator

Calculate bowel preparation solution volumes, split-dose timing, and evaluate prep quality with the Boston Bowel Preparation Scale (BBPS).

Inputs

Results

Total Prep Volume (mL)

4,000

BBPS Total Score (0–9)

9

Dose 1 Volume (mL)2,000
Dose 2 Volume (mL)2,000
Dose 1 Start Time (24h)18
Dose 2 Start Time (24h)5
Additional Clear Fluid (mL)1,000
Adequate Prep (0/1)1
Dose 1 Duration (min)125
Dose 2 Duration (min)125
Estimated Adr Impact0
How to Use This Calculator
  1. Enter the patient's Body Weight in kg and select the Prep Type (PEG 4L, low-volume 2L, or Suprep).
  2. Enter the Procedure Time (hour in 24-hour format) to calculate the dosing schedule.
  3. Enter Boston Bowel Preparation Scale (BBPS) scores for right colon, transverse, and left colon.
  4. Review Total Prep Volume, Dose 1 and Dose 2 volumes and start times.
  5. Check Total BBPS Score to document prep quality and assess adequacy for polyp detection.

What each input means

Body Weight (kg)
Patient body weight in kilograms.
Prep Type
Select colonoscopy prep solution.
Procedure Time (hour, 24h)
Scheduled procedure time in 24-hour format (e.g., 10 for 10 AM, 14 for 2 PM).
BBPS Right Colon
Boston Bowel Prep Scale for right colon.
BBPS Transverse Colon
Boston Bowel Prep Scale for transverse colon.
BBPS Left Colon
BBPS for left colon. Same scale as right colon.

What each result means

Total Prep Volume (mL)
Total volume of prep solution to consume.
Dose 1 Volume (mL)
First dose (evening before procedure).
Dose 2 Volume (mL)
Second dose (morning of procedure).
Dose 1 Start Time (24h)
Recommended start time for first dose (evening before).
Dose 2 Start Time (24h)
Recommended start time for second dose (morning of). Finish 4–5 hours before procedure.
Additional Clear Fluid (mL)
Extra clear fluids to drink with prep for hydration.
BBPS Total Score (0–9)
Boston Bowel Preparation Scale total. ≥6 with ≥2 per segment = adequate prep.
Adequate Prep (0/1)
1 = adequate prep (total ≥6 and each segment ≥2).
Dose 1 Duration (min)
Estimated time to finish dose 1 at 240 mL per 15 minutes.
Dose 2 Duration (min)
Estimated time to finish dose 2.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Body Weight (kg) = 70, Prep Type = 0, Procedure Time (hour, 24h) = 10, BBPS Right Colon = 3 = 6 input(s) provided
  2. Calculate Total Prep Volume
    4000 = 4000
  3. Calculate BBPS Total Score
    BBPS Total Score = rightColon + transverseColon + leftColon
    9 = 9
  4. Calculate Dose 1 Volume
    2000 = 2000
  5. Calculate Dose 2 Volume
    2000 = 2000

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