There are some instances where a dermal puncture is prohibited or not recommended.
Mastectomy patients
As a general rule, a dermal puncture, or a venipuncture, should not be performed on the side affected by a mastectomy. The body's ability to fight infection is compromised if lymph nodes are removed. A physician's permission must be obtained before performing a blood collection procedure on the same side as a mastectomy.
Edematous site
Dermal punctures should not be performed on previously punctured sites or swollen sites. Excess tissue fluid may contaminate the specimen.
Dehydrated patient
If the patient is dehydrated or has poor circulation, it may be impossible to get a quality specimen.
Fingerstick on a newborn or young infant
Dermal punctures must never be performed on the fingers of a newborn or very young infant (usually defined as under six months old and weighing less than 10 kg). There is very little distance between the skin and the bone. Therefore, the bone could be easily pierced during the puncture, causing injury to the bone, infection, or gangrene.
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by KimmyAsquith, Jun. 2019
Subjects: phlebotomy, phlebotomy Essentials 6th edition
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Which of the following tests requires an arterialized specimen?
A.) Bilirubin
B.) Blood gases
C.) Electrolytes
D.) Glucose
B.) Blood gases
Capillary puncture blood contains
A.) Arterial blood
B.) Interstitial fluid
C.) Venous blood
D.) All of the above
D.) All of the above
Capillary puncture is typically performed on adults when
A.) No accessible veins can be located
B.) Patients have thrombotic tendencies
C.) Veins are saved for chemotherapy
D.) All of the above
D.) All of the above
If collected by capillary puncture, which of the following is collected first?
A.) CBC
B.) Electrolytes
C.) Glucose
D.) Phosphorus
A.) CBC
Which of the following conditions disqualifies a site for capillary puncture?
A.) Cyanotic
B.) Edematous
C.) Swollen
D.) All of the above
D.) All of the above
The blood specimen for this test is placed in circles on special filter paper
A.) Bilirubin
B.) CBGs
C.) PKU
D.) Malaria
C.) PKU
This test cannot be collected by capillary puncture and taken to the laboratory for processing and testing