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What is Vacuum Collection Tubes?
Vacuum blood collection tubes, also known as evacuated tubes, are designed to automatically draw a predetermined volume of blood directly from the vein into the tube. These tubes have a vacuum seal that creates negative pressure, facilitating the swift collection of blood.
Blood Collection Tubes Prevents Contact With Infection
Most patients come in carrying contagious diseases. The nursing staff is most exposed to all the horrible diseases because they deal with blood samples all day. These diseases can easily transmit if the blood sample is not handled with all the necessary precautions. With the help of disposable vacuum blood collection tubes, nurses and hospital staff can extract blood from patients without contacting the blood. This is because the vacuum tubes are mostly in a closed state. The vacuum blood tubes are made with plastic or glass material, with light pressure. These tubes are non-friable and portable. All these factors contribute to the safety of the nursing staff.
These Tubes Prevent The Blood Samples From Getting Contaminated
The vacuum inside the blood tubes plays a crucial role in saving the blood sample of patients from catching contamination. When the patient’s blood is pumped into the tube, there is no way it can be exposed to the outside environment. Moreover, the vacuum blood collection tube is sterilized, therefore it is free of any dirt particles. Due to the vacuum that does not allow the blood sample to come in contact with the external environment, the accuracy of the test results is enhanced. All the vacuum blood collection tubes come with safety caps that ensure maximum protection of the blood sample inside. These protection caps prevent any dirt from getting in.
These Tubes Have An Accurate Scale
It is extremely important to have accurate scales in the blood tubes because when agents and other medicines are added, the results can vary. The vacuum blood collection tubes come with fine scales. So, when you add examination items and other substances to the blood sample of the patient, the results are guaranteed accurate.
Vacuum Tubes Can Be Used With A Variety Of Analyzers
The specifications of these vacuum collection tubes are kept in line with international standards. If you own a full range of these blood extraction tubes, you can easily conduct all the laboratory experiments. Moreover, the needle that comes with the tube is good enough to complete the testing of all the samples. This also lifts the pain of patients because they won’t be injected again and again.
The Tubes Are Environment-friendly
The vacuum tubes can be used for 24 months straight, without needing to get another. After this period, you can easily dispose of the tubes and they don’t harm the environment. When burning carbon, oxygen, and hydrogen in these tubes, they don’t produce toxic gases.
How Does a Vacuum Blood Collection Tube Work
A vacuum blood collection tube is a sterile glass or plastic tube with a closure that is evacuated to create a vacuum inside the tube facilitating the draw of a predetermined volume of liquid. The most common use of these tubes is for venipuncture or the drawing of blood from a patient’s vein.
The vacuum blood collection tube system is a closed system, meaning it is designed to prevent any potential contamination. It consists of a double-pointed needle, a plastic holder or adapter, and a series of vacuum tubes with rubber stoppers of various colors.
The process begins with the healthcare provider inserting one end of the needle into a patient’s vein. The other end of the needle, which is inside the plastic holder or adapter, then pierces the top of the vacuum tube. The vacuum in the tube pulls blood through the needle and directly into the tube.
The amount of blood drawn is controlled by the vacuum in the tube. Each tube is designed to draw a specific amount of blood, after which the vacuum is exhausted, and no more blood will be drawn. Once the required amount of blood has been collected, the tube is removed from the holder, and the needle is withdrawn from the patient’s vein.
The vacuum blood collection tubes are not all the same; they come with different additives which are used for different types of tests. The color of the tube’s rubber stopper is usually coordinated with the additive type. For example, a red stopper typically indicates a tube with no additives, while a lavender stopper indicates a tube with an anticoagulant additive.
After collection, the tubes are often gently inverted to mix the blood with the additive. The blood samples are then transported to a laboratory for analysis. The use of vacuum blood collection tubes has significantly improved the efficiency and safety of blood collection by reducing the risk of needlestick injuries and preventing potential contamination.
The Use of Vacuum Blood Collection Tubes of Different Colors
1. Red cap of blood collection tube
The tube used to collect blood contains no additives, no anticoagulant or procoagulant ingredients, only a vacuum. It is used for routine serum biochemistry, blood bank and serology-related tests, various biochemical and immunological tests, such as syphilis, hepatitis B quantification, etc. It does not need to be shaken after a blood draw. The type of specimen preparation is serum. After blood is drawn, it is placed in a 37°C water bath for more than 30 minutes, centrifuged, and the upper serum is used for later use.
2. The blood collection tube's orange red head cover
There is a coagulant in the blood collection tube to speed up the coagulation process. The rapid serum tube can coagulate the collected blood within 5 minutes. It is suitable for emergency serum series tests. It is the most commonly used coagulation test tube for daily biochemistry, immunity, serum, hormones, etc. After blood is drawn, invert and mix 5-8 times. When the temperature is low, it can be placed in a 37°C water bath for 10-20min, and the upper serum can be centrifuged for later use.
3. Golden cap of blood collection tube
Inert separating gel and coagulant are added to the tube used to collect blood. Specimens are stable for 48 hours after centrifugation. Procoagulants can quickly activate the coagulation mechanism and accelerate the coagulation process. The type of specimen preparation is serum, which is suitable for emergency serum biochemical and pharmacokinetic tests. After collection, invert and mix 5-8 times, stand upright for 20-30 min, and centrifuge the supernatant for later use.
4. Black cap of blood collection tube
The sodium citrate concentration required for the ESR test is 3.2% (equivalent to 0.109 mol/L), and the ratio of anticoagulant to blood is 1:4. Contain 0.4mL of 3.8% sodium citrate, and draw blood to 2.0mL. This is a special test tube for erythrocyte sedimentation rate. The sample type is plasma, which is suitable for ESR. Immediately after blood drawing, invert and mix 5-8 times. Shake well before use. The difference between it and the test tube for coagulation factor testing is that the concentration of anticoagulant is different from the blood ratio, which should not be confused.
5. Light blue cap of blood collection tube
Sodium citrate mainly acts as an anticoagulant by chelating calcium ions in blood samples. The anticoagulant concentration recommended by the National Committee for Standardization of Clinical Laboratories is 3.2% or 3.8% (equivalent to 0.109mol/L or 0.129mol/L), and the ratio of anticoagulant to blood is 1:9. The vacuum blood collection tube contains about 0.2 mL of 3.2% sodium citrate anticoagulant, and the blood is collected to 2.0 mL. The type of specimen preparation is whole blood or plasma. Immediately after collection, invert and mix 5-8 times. After centrifugation, take the upper plasma for use. Suitable for coagulation experiments, PT, APTT, coagulation factor examination.
6. Green cap of blood collection tube
Heparin was added to the blood collection tube. Heparin directly has the effect of antithrombin, which can prolong the coagulation time of the specimen. For emergency and most biochemical experiments, such as liver function, kidney function, blood lipids, blood sugar, etc. It is suitable for red blood cell fragility test, blood gas analysis, hematocrit test, erythrocyte sedimentation rate, and general biochemical determination, but not suitable for blood coagulation test. Excessive heparin can cause aggregation of white blood cells and cannot be used for white blood cell counts. It is also not suitable for leukocyte classification because it can make the blood film stained with a light blue background. It can be used for blood rheology. The sample type is plasma. Immediately after blood collection, invert and mix for 5-8 times, and take the upper plasma for use.
7. Light green head cover of blood collection tube
Adding heparin lithium anticoagulant to the inert separation rubber tube can achieve the purpose of rapid separation of plasma, which is the best choice for electrolyte testing. For emergency and most biochemical experiments, such as liver function, kidney function, blood lipids, blood sugar, etc. Plasma samples can be loaded directly on the machine and are stable for 48 hours under refrigeration. It can be used for blood rheology. The sample type is plasma. Immediately after blood collection, invert and mix for 5-8 times, and take the upper plasma for use.
What is a cuvette?
A cuvette is a small, transparent vessel used in scientific laboratories to hold samples for spectroscopic analysis. These samples can include liquids, gases, or solids dissolved in a liquid. Cuvettes are typically made of glass, plastic, or quartz, depending on the specific requirements of the analysis.
Characteristic of Optical Glass Cuvette
1. Optical glass cuvettes have high mechanical strength, strong adaptability to temperature changes, strong bonding parts, and can withstand several atmospheric pressures.
2. Optical glass cuvette is a very precise optical processing technology. The optical properties of the transparent surface are excellent, and the grouping error is less than 0.3%.
3. High quality quartz glass and optical glass are selected for glass cuvettes to ensure that there are no bubbles and stripes. Quartz cuvettes are more than 80% at 200 nm and glass cuvettes are more than 80% at 340 nm.
4. Optical glass cuvettes are sealed with low melting point glass, which has strong corrosion resistance and can withstand 6 mol/L sodium hydroxide, 6 mol/L hydrochloric acid, anhydrous ethanol, carbon tetrachloride and benzene for 24 hours without degumming and leakage.
The Role Of Cuvettes In Spectroscopy
Cuvettes play a critical role in spectroscopy, a branch of science concerned with the investigation and measurement of spectra produced when matter interacts with or emits electromagnetic radiation. Here’s a closer look at the role of cuvettes in spectroscopy
Sample Holder
The primary role of a cuvette in spectroscopy is to hold the sample. Whether the sample is gas, liquid, or solid, it is placed inside the cuvette for analysis. The cuvette allows the sample to be positioned correctly within the spectrophotometer or spectrometer, ensuring that the light beam passes directly through it.
Light Pathway
Cuvettes are designed to allow light to pass through the sample. They have at least two transparent sides, which form a clear path for the light beam. The light either gets absorbed by the sample or passes through it, depending on the sample’s properties. This interaction between the light and the sample forms the basis of spectroscopic analysis.
Path Length Control
The cuvette’s design also controls the path length of the light, which is the distance the light travels through the sample. The path length is a crucial factor in spectroscopic measurements as it affects the amount of light absorbed by the sample. According to Beer-Lambert Law, absorbance is directly proportional to the path length.
Material Selection
Cuvettes can be made from various materials, including glass, quartz, and plastic, each with different properties. The material chosen can affect the range of wavelengths that can be used in the experiment. For instance, quartz cuvettes are necessary for UV spectroscopy because quartz is transparent to UV light, while ordinary glass is not.
Volume Control
Cuvettes come in different sizes, allowing for control over the volume of the sample. This is particularly important in experiments where the sample volume is limited or needs to be precisely controlled.
Reproducibility
Cuvettes allow for reproducibility in spectroscopic measurements. By using cuvettes of the same size and material, and by ensuring they are clean and free from scratches, researchers can obtain consistent and reliable results.
Types Of Cuvette Volumes
The volume of the cuvette is a critical factor to consider during selection. Standard cuvettes typically hold larger volumes, making them suitable for routine analysis. In contrast, micro cuvettes, designed to handle small volumes, are ideal when sample quantity is limited, such as in biological or biochemical research. The cuvette’s volume can significantly influence spectrophotometric analysis, underscoring the importance of the appropriate volume selection for each experiment. Here are some common types:
Standard Cuvettes: These cuvettes typically have a sample volume of 0.35 ml to 35 ml. They are the most common type of cuvette compatible with most spectrophotometers and are used in a wide range of applications.
Micro Cuvettes: Micro cuvettes are designed to hold smaller sample volumes, typically ranging from 20 µl to 200 µl. They are often used when the sample volume is limited.
Semi-Micro Cuvettes
Semi-micro cuvettes have a sample volume that ranges from 0.35 ml to 1.75 ml. They are a compromise between standard and micro cuvettes.
Macro Cuvettes
Macro cuvettes are designed to hold larger sample volumes, typically ranging from 3.5 ml to 35 ml. They are often used when a large amount of sample is available.
Ultra-Micro Cuvettes
Ultra-micro cuvettes are designed to hold very small sample volumes, typically ranging from 2 µl to 50 µl. They are often used in DNA, RNA, and protein analysis where sample volume is extremely limited.
Nano Cuvettes
Nano cuvettes are designed to hold nanoliter volumes of sample, typically ranging from 0.1 µl to 2 µl. They are often used in applications that require very small sample volumes, such as single-cell analysis.
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