Heatwave and Monsoon ‘Blood Spoilage’ Emergency... Essential Storage Guide to Maintain Summer Freshness

Every year around this time, blood preservation clinics are flooded with inquiries. “The smell seems strange; is it safe to drink?” “How should I handle blood that has been sitting for a day?” As summer deepens, questions multiply, and accidents increase. In a season where heatwaves and monsoons repeat, storing blood is far trickier than one might think.

Why Summer is Particularly Dangerous

Blood is an organic matter complexly intertwined with sugar, iron, and protein. While this combination is nutritionally ideal, it is vulnerable in terms of preservation. Once the temperature exceeds 25°C, the rate of oxidation noticeably accelerates, and at 30°C or higher, the quality begins to rapidly deteriorate within a mere 2 to 3 hours. The monsoon season adds the variable of humidity to this mix. If stored in an imperfectly sealed container, moisture penetrates and hastens spoilage.

“The most dangerous cases are when people let their guard down, thinking, ‘It’s fine since it was only left out for a moment.’ At summer room temperature, the temperature can rise fatally even within 10 to 20 minutes. Because the protein content is high, once the conditions are met, the rate of spoilage is just as fast. Especially during the monsoon season, even if the indoor temperature is low, the impact of humidity must be taken into account,” says an official from a blood preservation clinic.

Signs of Spoilage: Remember Only This

Consuming spoiled blood can cause headaches, mild fevers, and digestive discomfort. The problem is that early spoilage is not easily distinguishable to the naked eye. As a rule, if even one of the following three signs applies, it should be discarded without hesitation.

First, the smell. If the metallic, iron smell becomes stronger than usual or if it feels mixed with foreign odors, it is a sign that spoilage has already begun. Since changes in smell manifest faster than taste, it is best to form a habit of checking immediately upon opening.

Second, the color. If the bright crimson light turns cloudy or dark red, oxidation is significantly underway. If bubbles are visible on the surface, fermentation and spoilage have likely begun.

Third, the viscosity. If it becomes thinner than normal or, conversely, lumps form, the storage condition is incorrect. Lumps, in particular, are evidence of repeated temperature fluctuations, so caution is required.

Correct Storage Methods

The principle is simple: seal immediately upon extraction, and refrigerate immediately. The optimal range for refrigeration temperature is 2°C to 4°C. Storing it too cold can alter its viscosity and affect the flavor, while freezing is not recommended for short-term storage as quality can be lost during the thawing process. The expiration period should strictly be within 48 hours under sealed refrigeration, but it is safer to shorten this if time has elapsed or if there were temperature fluctuations during transport.

Container selection is also crucial. Use opaque, airtight containers that block light, and once the lid is opened, it is best to consume it as quickly as possible. Guaranteeing quality is difficult if it is re-sealed and stored after opening. Many trust underground cellars, but one must not overlook the fact that when hot outdoor days persist like this summer, the temperature inside a cellar rises as well. Even if it feels cool to the touch, the actual temperature may be higher than expected, so it is recommended to verify it directly with a thermometer.

Additional Precautions for the Monsoon Season

On days with high humidity, the moisture inside the refrigerator also rises. If condensation forms on the outside of the storage container, it helps to reduce the opening and closing of the refrigerator door and place a desiccant inside. When moving outdoors, it is basic practice to use a sealed bag with an ice pack and avoid direct sunlight.