What is a Nitrazine test

This test involves putting a drop of fluid obtained from the vagina onto paper strips containing Nitrazine dye. The strips change color depending on the pH of the fluid. The strips will turn blue if the pH is greater than 6.0. A blue strip means it’s more likely the membranes have ruptured.

When do you perform a nitrazine test?

All samples remained ferning and nitrazine positive. Therefore optimal analysis of suspected amniotic fluid occurs when specimens are air-dried for 10 minutes. These tests may be reliably performed at gestations of 12 to 41 weeks.

What is a nitrazine swab?

A swab impregnated with nitrazine yellow dye is brought into contact with the upper vagina. The swab absorbs fluid associated with the tissue and the dye develops a colour which correlates with the pH of the absorbed fluid over the range pH 5.0 to pH 7.5.

How accurate is nitrazine test?

The accuracy of the applied tests was 92.1%, 93.6%, 82.8% and 72.8% respectively for SPONT, Nitrazine, Fern and Pooling tests. There wasn’t significant difference between accuracy of SPONT and standard clinical assessment (92.1% vs. 89.3%).

Can a nitrazine test be wrong?

Nitrazine test may also lead to false positive or negative results due to probable contamination by alkaline urine, semen, blood, meconium, vaginitis, cervicitis and using antibiotics. Fern test has also 13-30% false negative and 5-30% false positive results (13, 14).

What color does Nitrazine paper turn with amniotic fluid?

Because amniotic fluid is neutral (pH 7.0) or slightly alkaline (pH 7.25), it will change the yellow color of Nitrazine Paper.

Is Nitrazine paper the same as pH paper?

Nitrazine (pH indicator)below pH 4.5above pH 7.54.5⇌7.5

Is amniocentesis a genetic test?

Genetic Amniocentesis. An amniocentesis is a prenatal test that can diagnose genetic disorders (such as Down syndrome and spina bifida) and other health issues during pregnancy.

How do you perform a Nitrazine test?

Nitrazine Test This test involves putting a drop of fluid obtained from the vagina onto paper strips containing Nitrazine dye. The strips change color depending on the pH of the fluid. The strips will turn blue if the pH is greater than 6.0. A blue strip means it’s more likely the membranes have ruptured.

How do you use Nitrazine paper?

1. Add one drop of buffer to Nitrazine test paper.
2. Compare color to the paper dispenser’s pH scale. The pH must be within 0.5 of the designated pH to be acceptable.
3. Document all results on the Control Sheet. If controls are out of range do not report any patient results until corrective action has been taken:

Article first time published on

What is Nitratest paper used for?

Nitrazine (phenapthazine) paper is used to measure vaginal pH in two settings. 1. Assessment of membrane rupture in pregnant women as described in the Procedure for Premature Rupture of membranes (PROM) as found in the OB GYN Policy and Procedure Manual.

Does Nitrazine paper expire?

The pH Nitrazine paper and pH buffers are not used after the expiration date. … The pH Nitrazine dispenser roll and pH buffer bottles are to be dated when initially opened. “Date Opened” Label. The yellow “Date Opened” Label should be affixed to the dispenser roll of pH paper/ pH buffer bottle when it is first opened.

What is ferning in pregnancy?

When high levels of estrogen are present, such as just before ovulation (or during pregnancy), the cervical mucus forms fern-like patterns due to crystallization of sodium chloride on mucus fibers. This pattern is known as arborization or ‘ferning’.

How long can you stay pregnant with ruptured membranes?

Fetal membrane rupture has traditionally been regarded as an irreversible process: the mean latency period from membrane rupture to delivery is 12 days at 20–26 weeks of gestation and 4 days at 32–34 weeks of gestation (Parry and Strauss, 1998).

What can cause prom?

• Infections of the uterus, cervix, or vagina.
• Too much stretching of the amniotic sac (this may happen if there is too much fluid, or more than one baby putting pressure on the membranes)
• Smoking.
• If you have had surgery or biopsies of the cervix.
• If you were pregnant before and had a PROM or PPROM.

Does amniotic fluid dry yellow?

Unlike actual yellow discharge, amniotic fluid is very thin and clear or pale yellow in color — like urine. And it’s usually odorless or slightly sweet-smelling.

What pH is amniotic fluid?

Amniotic fluid normally has a pH of 6.5 or above whereas vaginal pH is 3.5–4.5.

How do you test for ruptured membranes?

ROM is diagnosed by speculum vaginal examination of the cervix and vaginal cavity. Pooling of fluid in the vagina or leakage of fluid from the cervix, ferning of the dried fluid under microscopic examination, and alkalinity of the fluid as determined by Nitrazine paper confirm the diagnosis.

What are the causes of Oligohydramnios?

• Your water breaking before you go into labor.
• Poor fetal growth.
• Your pregnancy going past your due date.
• Birth defects (kidney and urinary tract problems may be likely)
• You are pregnant with identical twins who share a placenta (called twin-to-twin transfusion syndrome)

How is Pprom diagnosed?

1. pH (acid-base) balance testing. The pH balance of amniotic fluid is different from vaginal fluid and urine. Your healthcare provider will put the fluid on a test strip to check the balance.
2. Looking at a sample under a microscope. When amniotic fluid is dry, it has a fern-like pattern.

What does a positive Amnisure test mean?

The Amnisure ROM™ test is approved for the diagnosis of rupture of membranes (ROM). Yet, a fraction of patients with a positive test have intact membranes by sterile speculum examination.

What does amniotic fluid smell like?

Amniotic Fluid Will Not Smell Like Urine Urine will have an ammonia smell, whereas amniotic fluid may be odorless, or have a sweet or earthy odor.

Is leakage normal during pregnancy?

The uterus sits on the bladder during pregnancy, so it is not uncommon for pregnant women to leak urine. If the discharge smells like urine, it probably is. Women may also experience an increase in vaginal discharge during pregnancy. Normal discharge tends to have a mild smell and look milky.

Is amniotic fluid yellowish?

Normal amniotic fluid is clear or tinted yellow. Fluid that looks green or brown usually means that the baby has passed the first bowel movement (meconium) while in the womb. (Usually, the baby has the first bowel movement after birth.)

Can an amniocentesis detect autism?

Cambridge researchers are pioneering a new test for autism in the womb, by measuring the levels of testosterone produced by the foetus, which makes its way into the amniotic fluid. They hope to test if children who later develop autism have unusually high levels of testosterone between 12 and 20 weeks of pregnancy.

Which is more accurate NIPT or amniocentesis?

NIPT is more accurate than CFTS, with very high sensitivity (99.3%) and specificity (99.9%) for trisomy 21. 4 5 NIPT is safer than invasive diagnostic techniques such as chorionic villus sampling and amniocentesis, which carry a miscarriage risk of 0.1%–0.2%.

What all does amniocentesis test for?

Amniocentesis is a prenatal procedure that your doctor may recommend you have during pregnancy. The test checks for fetal abnormalities (birth defects) such as Down syndrome, cystic fibrosis or spina bifida.

How do you do a ferning test?

Examine the air-dried smear under the microscope without a coverslip and using low power magnification (10x magnification). I. Dried amniotic fluid produces a microscopically visible crystallization in a “fern” pattern. Dried normal vaginal fluid does not produce a “fern” pattern.

How is the amniotic fluid formed?

Amniotic fluid is present from the formation of the gestational sac. Amniotic fluid is in the amniotic sac. It is generated from maternal plasma, and passes through the fetal membranes by osmotic and hydrostatic forces. When fetal kidneys begin to function around week 16, fetal urine also contributes to the fluid.

What is preterm PROM?

Premature rupture of membranes (PROM) is the rupture of the fetal membranes before the onset of labor. In most cases, this occurs near term, but when membrane rupture occurs before 37 weeks’ gestation, it is known as preterm PROM.

What is the difference between Qt 10 and QT 40 test strips?

QT-10 Test Strips are used for quaternary ammonia such as the blue tablets often used in a bar’s three-bay sink. They are also used for liquid quaternary ammonia that has only one “quat” listed in the ingredients. QT-40 Test Strips are used for sanitizers that are multi-quat.