- What tests Cannot be performed on capillary blood?
- How do you perform a capillary puncture?
- What can be done to help blood flow quicker from the finger?
- Why do we collect capillary samples from the middle and ring fingers?
- Why do we do capillary blood testing?
- Which finger is best for capillary collection?
- What are the areas to be avoided in performing capillary puncture?
- Why do you wipe the first drop of blood?
- Which finger is most commonly used for pricking?
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..
How do you perform a capillary puncture?
Hold the finger in an upward position and lance the palm-side surface of the finger with proper-size lancet (adult/child). Press firmly on the finger when making the puncture. Doing so will help you to obtain the amount of blood you need. Cap the Microtainer® and gently invert it 10 times to prevent clots from forming.
What can be done to help blood flow quicker from the finger?
Soak your entire hand (not just the tips) in warm water for 2 minutes. Skip on the spot (if you can) to get your heart rate up — this helps your blood to flow quicker. Prick the corner of your fingertip — it’s less sensitive and makes it easier to direct your blood.
Why do we collect capillary samples from the middle and ring fingers?
The palmar surface of the fingertip (fleshy pad) of the middle (3) or ring (4) finger is usually selected for puncture for a variety of reasons. The fingertips of these fingers are usually less calloused, have fleshier pads and cause less discomfort for the patient.
Why do we do capillary blood testing?
Because blood has many functions, tests on the blood or its components provide valuable clues in the diagnosis of medical conditions. 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).
Which finger is best for capillary collection?
In order to collect blood with a capillary tube, the appropriate site must be cleaned and punctured with a lancet so that a drop of blood can be gently expressed. But what is an appropriate site? Finger – Usually the third or fourth finger is preferred in adults and children.
What are the areas to be avoided in performing capillary puncture?
The posterior heel and toe should be avoided as puncture sites because the distance between the skin surface and the bone in each case is only 2.33 or 2.19 mm, respectively, which means greater risk of bone damage (3, 13).
Why do you wipe the first drop of blood?
The first drop of blood can be used for self-monitored glucose testing, but only after washing hands. If washing hands is not possible and they are not visibly soiled or exposed to a sugar-containing product, it is acceptable to use the second drop of blood after wiping away the first drop.
Which finger is most commonly used for pricking?
Prick your finger with the lancing device at the sides of the finger as there are less nerve ending here than at the tips or the ‘pads’. Recommended finger: the World Health Organisation recommends the middle or ring fingers are used for blood glucose tests (second and third fingers).