Amnicator® - The Ideal Test for PROM

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  • picEasy to use
  • Highly sensitive indicator
  • Non-invasive (no needles)
  • Non-threatening to patient
  • Room temperature storage
  • 2 year shelf life
  • Easy to read colour change visible in seconds

About Amnicator®

Amnicator® - rapid and simple method for detecting ruptured amniotic membranes. Amnicators® are individually wrapped sterile swabs impregnated with a sensitive pH indicator, Nitrazine yellow. The principle of the Amnicator® test is that normal vaginal pH at term ranges between 4.5-6.0 and amniotic fluid is usually 7.0-7.5. By means of a simple pH colour change of the Nitrazine yellow, which has a sharp end point, (6.4-6.8), exactly in the desired pH range, the midwife or obstetrician can accurately detect the presence of amniotic fluid. Amnicators® will reliably distinguish neutral or slightly alkaline amniotic fluid from the acidic cervical and vaginal mucus or urine.

Using a sterile speculum an Amnicator® is introduced into the vagina and any fluid coming from the cervix or pooled in the posterior vaginal fornix is sampled. The Amnicator® is then simply withdrawn and examined for a colour change. Leakage or even a small amount of fluid is sufficient to change the nitrazine yellow indicator. The Amnicator® test is far quicker and simpler to perform than resorting to the microscopic examination of escaping fluid, detecting the presence of protein or using orally administered dyes to stain urine, to distinguish amniotic fluid from normal secretions and urine.


1. ABE, T. The detection of the rupture of foetal membranes with the nitrazine indicator. American Journal of Abstetrics and Gynaecology 1940, 39:400-404

2. Drife, J. Preterm rupture of the membranes. British Medical Journal 1982; 285:583

3. Mills, A., Ganloch D., Use of the nitrazine yellow swab test in the diagnosis of the ruptured membranes. British Journal of Obstetrics and Gynaecology 1977; 84: 138-140

4. Pauersterin, C., Premature rupture of the membranes. In: Clinical Obstetrics, Anonymous, ed., John Wiley & Sons and Churchill Livingston, 1987; 367-381

5. Pritchard, J., Macdonald P., Williams Obstetrics, Anonymous, ed., New York: Appleton-Century-Crofts, 1960; 407-408

6. Filet, J.P., More, N., Librati, C., Ruffie, A., Delouis, P., Cluzeau, M.H., Hocke, C., Lang, J.J., Evalution de trois methodes diagnistiques dans ta rupture prematures des membranes. Rev. Fr. Gynecol. Obstet.1994, 89:123-128 (English abstract).(PDF 374Kb opens in a new window)

colour samples

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