Endotoxin detection method steps

Jan 16, 2023 Source: Cainiu Health

Dr. Yang Shuwen

Introduction

Endotoxins are closely associated with various infectious diseases. Deterioration of the condition is often accompanied by an increase in endotoxin levels, while improvement is frequently associated with a decrease in endotoxin levels. Therefore, measuring endotoxin levels in blood and organs can provide valuable reference for the diagnosis and prognosis of related clinical conditions. The procedure should be performed only by trained professionals.

Testing for endotoxin levels in blood and organs can provide reference for the diagnosis and prognosis of clinically related diseases. The procedure must be performed by trained professionals. The blood collection process is as follows:

1. Before drawing blood, healthcare providers should help ease the patient's anxiety to prevent any complications during the procedure.

2. Select a superficial vein on the body surface. Once chosen, apply a tourniquet proximal to the puncture site on the forearm, and instruct the patient to clench their fists to enhance venous filling.

3. The phlebotomist gently taps the area around the puncture site to make the vein more prominent, then disinfects the site with iodophor and alcohol.

4. After the iodophor has dried, the phlebotomist holds the needle at a 30-degree angle to the skin, inserts it into the vein, advances it approximately 2 cm parallel to the vein, and connects the needle hub to the blood collection tube.

5. After blood collection, release the tourniquet and withdraw the needle. Immediately apply a cotton swab or gauze to the puncture site and maintain pressure. Remove the swab after 3–5 minutes, once bleeding has stopped.

6. Send the collected blood sample to the laboratory for testing.

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Video on Bacterial Endotoxin Testing Methods

Bacterial endotoxin is a biological toxin produced by Gram-negative bacteria that can trigger inflammatory responses in the human body. It can be detected through a routine blood test, which must be performed at a正规 hospital. The specific procedure is as follows: the individual should bring relevant identification documents to the hospital and register with the hematology department. During the consultation, the person should inform the doctor of the purpose of the visit. The doctor will also inquire about relevant medical history and perform an appropriate physical examination.

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Endotoxin detection method

The endotoxin detection method may involve routine blood tests and blood biochemical index examinations. If no complications are found after examination, the patient's routine blood test results and biochemical indicators—such as liver and kidney function and blood glucose levels—are all normal. Routine blood tests should be conducted at a qualified hospital, typically using the finger-prick blood collection method.

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Bacterial Endotoxin Testing Method

The specific method for detecting bacterial endotoxins is as follows: First, treat all glassware using the dry-heating method, then add and dissolve the limulus amebocyte lysate (LAL) reagent and set aside. Next, add the test sample to form the test sample tube, add endotoxin to serve as the positive control tube, and add LAL reagent solution as the negative control tube. After mixing thoroughly, place the tubes vertically in a water bath at 36–38°C, incubate for 58–62 minutes, remove, and invert to examine gel formation. Interpret the results based on the observations.

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Is endotoxin from Gram-negative or Gram-positive bacteria?