Related Experiment Video
Updated: Jul 16, 2026

14:40
Instrumentation of Near-term Fetal Sheep for Multivariate Chronic Non-anesthetized Recordings
Published on: October 25, 2015
Is amniotic fluid volume influenced by a 24-hour fast?
1Ultrasound Unit, Lis Maternity Hospital, Tel Aviv Sourasky Medical Center, Sackler Faculty of Medicine, Tel Aviv University, Israel.
The Journal of Reproductive Medicine
|September 15, 2000
Summary
Fasting for 24 hours significantly reduces amniotic fluid index (AFI) in pregnant individuals. However, normal amniotic fluid volume is restored after fluid intake.
Area of Science:
- Obstetrics and Gynecology
- Maternal-Fetal Medicine
- Reproductive Physiology
Background:
- Amniotic fluid volume is crucial for fetal development and well-being.
- Factors influencing amniotic fluid levels, such as maternal diet, are of clinical interest.
Purpose of the Study:
- To investigate the impact of a 24-hour fast on the amniotic fluid index (AFI).
- To determine if fluid intake can reverse any observed changes in AFI.
Main Methods:
- Prospective study comparing AFI in 22 fasting pregnant individuals with 25 non-fasting controls.
- AFI measurements were taken after a 24-hour fast and again after one week.
- Examinations were conducted by two blinded observers.
Main Results:
- A statistically significant lower AFI was observed in the fasting group compared to the non-fasting group immediately after the fast (P < .01).
- No significant difference in AFI was found between the groups after one week (P > .01), suggesting recovery.
Conclusions:
- A 24-hour fast may lead to a temporary reduction in amniotic fluid volume.
- Adequate fluid intake appears to be effective in restoring normal amniotic fluid levels.
Related Concept Videos
Body Water Content and Fluid Compartments
Life's biochemical processes occur within aqueous solutions. Solutes are substances that are dissolved within these solutions. The human body contains a variety of solutes, which can differ across various body parts. These can encompass proteins—such as those responsible for clotting and carbohydrate transport—as well as electrolytes. In medicine, an electrolyte is often described as a mineral ion derived from a salt possessing an electric charge. Examples include sodium ions (Na+) and chloride...
Composition of Body Fluids
Water functions as a solvent accommodating various solutes, which can be categorized under electrolytes and non-electrolytes. Non-electrolytes are usually held together by covalent bonds, restricting them from dissociating in solution, thereby leading to a lack of electrically charged components upon dissolving in water. They are predominantly organic molecules, such as glucose, creatinine, and urea. Electrolytes, on the other hand, are compounds that can break down into ions in water.
Regulation of Water Intake
Osmolality refers to the number of solute particles per kilogram of solvent in a solution. Plasma osmolality specifically indicates the total number of solute particles per kilogram of water in blood plasma. This value reflects the body's hydration status and is tightly regulated through mechanisms controlling water intake and output. While water consumption is a conscious decision, the body has intrinsic regulatory systems to maintain fluid balance. Dehydration, a state of water deficit...
Regulation of Water Output
The human body predominantly expels water through the urinary system. On average, an individual generates around 1.5 liters of urine each day. This amount can fluctuate based on how well a person is hydrated, but a critical minimum quantity of urine must be produced to ensure the body's proper functioning. Daily, the kidneys remove 600 to 1200 milliosmoles of dissolved substances, effectively excreting excess minerals and water-soluble toxins such as creatinine, urea, and uric acid from the...
Urodynamic Studies: Uroflowmetry
Uroflowmetry is a non-invasive urodynamic test designed to measure various aspects of urination, including volume, flow rate, and the time to void. This test is crucial for diagnosing and assessing conditions such as bladder outlet obstruction, bladder dysfunction, incomplete bladder emptying, incontinence, and urinary tract blockages caused by benign prostatic hyperplasia (BPH) and urethral strictures.Pre-Test Instructions:Before a uroflowmetry test, patients are typically advised to drink...
Ascites
DefinitionAscites is the buildup of fluid inside the peritoneal cavity. It occurs when fluid moves out of the vascular system faster than the peritoneal lymphatics can remove it. This fluid shift is most commonly seen in liver cirrhosis but can also appear in several other systemic disorders.EtiologyCirrhosis remains the leading cause of ascites. Other conditions that can contribute include:Heart failureConstrictive pericarditisAbdominal cancersNephrotic syndromeSevere protein–calorie...

