What is the purpose of a magnetic stirrer?
A magnetic stirrer is a device widely used in laboratories and consists of a rotating magnet or a stationary electromagnet that creates a rotating magnetic field. This device is used to make a stir bar, immerse in a liquid, quickly spin, or stirring or mixing a solution, for example.
What is the principle of magnetic stirrer?
A magnetic stirrer or magnetic mixer is a laboratory device that employs a rotating magnetic field to cause a stir bar immersed in a liquid to spin very quickly and thus stirring the liquid. The rotating field created by a rotating magnet placed beneath the vessel with the liquid.
What are the possible causes of Microclots in a sample?
Blood clots Incomplete dissolution of anticoagulant in the syringe due to inadequate mixing immediately after collection can result in the formation of blood clots. The presence of microclots in the specimen renders it non-homogeneous, thus affecting the accuracy of analytical results.
How do you mix blood in capillary tube?
Fill the tube to at least the 250 uL mark. After filling, turn the capillary/tube unit immediately in a vertical position to allow the blood to flow into the tube. Gently flick the bottom of the tube several times to begin the mixing process. Remove the capillary tube and its holder at the same time.
What tests Cannot be performed on capillary blood?
Certain tests cannot be performed on capillary blood due to the large volume they require or the possibility of contamination. These include the following: Westergren erythrocyte sedimentation rate (ESR) test, due to large blood volume required.
What test uses capillary blood?
Blood smear is also one of the most frequently performed tests on capillary blood.
What is the difference between venous blood and capillary blood?
It is well known that capillary blood has higher hemoglobin (Hb) and hematocrit (Hct) values than venous blood. In each group, venous platelet counts were significantly higher than the corresponding capillary values.
What are the test done for capillary?
Below is a list of common tests performed on capillary blood specimens some of which are point-of-care tests or home self-testing:
- Blood smears for manual white blood cell count.
- Complete blood count (CBC)
- Hemoglobin & hematocrit (H&H)
- Electrolytes.
- Neonatal blood gasses.
- Neonatal bilirubin.
- Neonatal screening.
- Glucose.
What are the benefits of doing a capillary blood draw?
Capillary blood sampling has several advantages over drawing blood from a vein: It is easy to obtain (it can be difficult to obtain blood from the veins, especially in infants). There are several collection sites on the body, and these sites can be rotated. Testing can be done at home and with little training.
What are the advantages of pen like capillary puncture devices?
Terms in this set (4)
- Capillary puncture is less invasive, quicker and generally less painful than venipuncture. Perception of Accuracy.
- Accuracy/Precision of Test Results. Number of Tests Supported.
- Immediate Results. Test Measurement Range.
- Timeliness in Counseling. …
Which finger is best for capillary collection?
But what is an appropriate site? Finger – Usually the third or fourth finger is preferred in adults and children. The thumb has a pulse and is likely to bleed excessively. The index finger can be calloused or sensitive and the little finger does not have enough tissue to prevent hitting the bone with the lancet.
Why do you wipe away the first drop of blood in a capillary puncture?
Wipe away the first drop of blood because it may be contaminated with tissue fluid or debris (sloughing skin). Avoid squeezing the finger or heel too tightly because this dilutes the specimen with tissue fluid (plasma) and increases the probability of haemolysis (60).
Why is blood sugar different in each finger?
Contamination of the fingers is a common culprit in blood sugar reading variability. That’s because it only takes a little bit of food residue on your hands to impact blood glucose levels.
Why do we use ring finger for pricking?
The middle or ring finger is preferred as having the greatest depth of tissue beneath the skin and hence offering the least chances of injury. The thumb or index finger may be more likely to be calloused or scarred, as well as being much more sensitive, making the procedure more painful.