Your body has subtle but revealing warning mechanisms. Among them, your skin's reaction to a pinch is an excellent way to detect a lack of water. Professionals call this skin turgor testing.
This simple, quick test, often used in clinical settings, allows for a rapid assessment of fluid balance, in addition to other bodily signals. Better understanding these indicators will help you act before signs of dehydration accumulate.
What is a skin fold?
When the skin is pinched and then released, it forms what is called a temporary fold. If hydration is sufficient, the skin quickly returns to its shape. If, on the contrary, it remains wrinkled or takes time to flatten, it may indicate an imbalance in your hydration.
This phenomenon is related to tissue tension. Supple skin indicates good water distribution in the body. Conversely, slow or flaccid skin may suggest fluid loss. This visual signal is particularly monitored in young children or in cases of prolonged illness.
It is also useful to differentiate between:
- a fold related to dehydration, with taut skin that takes time to smooth out;
- and a fold due to fat loss, where the skin remains thin and loose.
The skin fold test: a simple way to assess hydration
This quick test, also used by doctors, involves gently pinching the skin, often on the back of the hand or forearm. Then, you observe whether it immediately returns to its original shape or not.
Here's how to perform the test at home
1. Choose a clean area, at room temperature;
2. Gently grasp the skin between your thumb and forefinger;
3. Release, then observe: an immediate return is a good sign. A visible fold for more than one to two seconds may be a warning.
Note that in children, the abdomen or inner thigh is preferred for this skin manipulation. In adults, especially the elderly, natural loss of skin elasticity can skew the results. It is therefore important to consider other factors, which we will discuss later.
This observation gesture is therefore part of a set of clinical indicators used to check hydration, just like monitoring body temperature, weight, or urine status.
Other visible signs of dehydration
In addition to skin observation, other symptoms may alert you, such as:
● Dry mouth, sticky tongue sensation;
● Chapped lips, general discomfort;
● Unusual fatigue, dizziness when standing;
● Very dark urine or reduced quantity;
● Headaches, mild confusion, concentration problems;
● Sunken eyes, dark circles.
In young patients, dehydration can cause a loss of appetite, irritability, or a lack of energy. In elderly individuals, it can be more difficult to detect, as the thirst reflex naturally decreases with age.
Skin fold and nutritional assessment: a tool used in medical settings
In a medical context, this test is integrated into an overall health assessment. It is often performed in hospitals, nursing homes, or care centers to monitor vulnerable patients.
In addition to this skin manipulation, caregivers generally observe:
● The evolution of body weight;
● The presence of signs of malnutrition (fat loss, muscle wasting);
● Analysis of water and electrolyte intake;
● The use, if necessary, of intravenous fluids in cases of severe dehydration.
A device called a caliper can also be used to check tissue thickness. This allows for a more precise approach, particularly in nutritional monitoring or during long hospitalizations.
In all cases, this skin manipulation is non-invasive, quick, and can be integrated into a complete clinical evaluation.
Dry skin or dehydrated skin: how to tell the difference?
The two situations may seem similar, but their origins are distinct:
● Dry skin lacks lipids. It requires lipid-rich care, or even specific nourishing products;
● Dehydrated skin lacks water. It may feel tight, appear dull or uncomfortable, even if it produces sebum.
It is therefore possible to have oily but dehydrated skin. This paradox is common, especially in people living in dry climates or using skincare products unsuited to their skin.
The pinch test can complement visual observation. Skin that takes time to relax may require an adjustment of internal and external hydration.
What to do if a fold persists?
Adjust your fluid intake
● Drink small sips regularly throughout the day, even if you don't feel thirsty;
● Alternate water, herbal teas, broths, or semi-skimmed milk, which are sources of water and minerals;
● Prioritize water-rich foods: salads, fresh fruits, compotes.
For everyone, it is important to increase fluid intake during hot weather, physical activity, or episodes of diarrhea. For children, remember to offer drinks frequently.
Identify the causes of dehydration
Certain situations should raise an alarm, such as:
● Persistent vomiting or diarrhea;
● Taking diuretic medications;
● Chronic conditions (diabetes, mild kidney failure);
● Exposure to excessive heat without adapting fluid intake.
Consult if symptoms persist
A medical consultation is necessary if you notice:
● A rapid worsening of symptoms;
● Sudden weight loss;
● Unusual behavior in a child;
● A significant decrease in urine output.
The professional will be able to establish an accurate diagnosis and recommend appropriate treatment: either an oral rehydration solution or intravenous fluids in the most severe cases. In some cases, an analysis of the underlying causes (underlying pathology, unbalanced diet) will be necessary.
In summary: listen to your skin's signals to preserve your health
This quick skin turgor test is a simple, accessible, and useful reflex for everyone. Whether you are a parent, an athlete, a healthcare professional, or caring for an elderly loved one, this test can help you prevent the consequences of a hydration deficit.
However, it does not replace medical advice. If a skin test shows signs of dehydration, it is recommended to consult a healthcare professional.
Your skin reflects much more than its external appearance; it is a true barometer of your internal state. Listening to it means protecting your balance.
Bibliography
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Nutrients, 14(10), 2085. https://doi.org/10.3390/nu14102085
Taylor, K., & Tripathi, A. K. (2025, March 5). Adult dehydration. StatPearls - NCBI Bookshelf. https://www.ncbi.nlm.nih.gov/books/NBK555956/
McGarvey, J., Thompson, J., Hanna, C., Noakes, T. D., Stewart, J., & Speedy, D. (2008). Sensitivity and specificity of clinical signs for assessment of dehydration in endurance athletes. British Journal Of Sports Medicine, 44(10), 716‑719. https://pubmed.ncbi.nlm.nih.gov/18981042/
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https://medlineplus.gov/ency/article/003281.htm
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