Podcast
Questions and Answers
Why is excessive squeezing avoided during a finger prick?
Why is excessive squeezing avoided during a finger prick?
- To minimize pain for the patient
- To prevent the finger from turning blue
- To avoid diluting the sample with tissue fluid (correct)
- To ensure faster blood flow
Which vein is typically preferred for venipuncture in the forearm?
Which vein is typically preferred for venipuncture in the forearm?
- Basilic vein
- Cephalic vein
- Median cubital vein (correct)
- Brachial vein
What is the recommended depth for a finger prick?
What is the recommended depth for a finger prick?
- 10 to 11 mm deep
- 5 to 6 mm deep
- 8 to 9 mm deep
- 2 to 3 mm deep (correct)
From which part of the heel should blood NOT be taken on a newborn?
From which part of the heel should blood NOT be taken on a newborn?
What is a blood sample collected after a meal called?
What is a blood sample collected after a meal called?
Flashcards
Shock Glucose Discrepancy
Shock Glucose Discrepancy
Blood glucose in shock patients can be significantly lower (50% less) in finger prick samples compared to venous blood.
Warming the Finger
Warming the Finger
Warm the finger before obtaining a blood sample to improve blood flow and obtain an adequate sample.
Heel Prick Site (Newborns)
Heel Prick Site (Newborns)
For newborns under 3 months, the heel is a suitable site for blood collection, but avoid the central and back portions.
Correct Finger Prick Location
Correct Finger Prick Location
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Postprandial Sample
Postprandial Sample
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Study Notes
- A patient in shock has 50% less blood glucose than venous blood
- Warm the finger before taking a blood sample
- The heel is the best site for a newborn under 3 months old for a small blood quantity
- The heel stick depth should not be more than 2.4 mm on the heel
- Avoid the central portion and back of the heel when performing a heel stick
- The recommended finger prick is 2 to 3 mm deep
- Prick the finger midway between the edge and midpoint of the finger
- Do not prick near the nails
- Avoid excessive squeezing
Correct Finger
- Middle finger
- Best for diabetic patients
- Avoid the ear lobe because the blood flow is slower, may get raised Hb
Heel Puncture
- Do not take blood from the back of the heel
- For larger quantities, venous blood is drawn
- The blood sample is taken from the forearm, wrist, or ankle veins
- A forearm site is preferred; blood is taken directly from the vein, called phlebotomy
- The median cubital vein is usually preferred
- Mostly venous blood is drawn in the fasting state
- Blood collected after the meal is called a postprandial sample
- There are biological variables in the blood collection, such as patient lying in bed or standing up, and after exercise
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Description
Learn about proper blood sampling techniques. Topics covered include ideal blood glucose levels, warming the finger before sampling, heel stick depth recommendations, and selecting appropriate sites on the finger and heel. Avoid the central portion and back of the heel when performing a heel stick.
