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Chap 18 cont 3

Blood sample collection and positioning

the method and needle gauge selected depend on the vessel size, the amount of blood required, the intended use of the sample and teh technicians preference
forceful retraction of the syringe may result in hemolysis of red blood cells as they pass through the needle
wiping the hair and skin with isopropyl alcohol achieves removal of skin contaminants, causes vasodilatation, improves visualization of the vein.
the most important aspects of any venipuncture technique aare proper restraint of the animal and proper distention and immobilization of the vessel
the most frequently used sites for canine blood collection are cephalic, jugular, and lateral spahenous veins
the most frequently used sites for feline collection are cephalic, jugular, femoral and medial saphenous
In sternal positioning venipuncture is usually done in a cephalad direction
in lateral positioning venipuncture is generally done in a caudal direction
cephalic venipuncture the vein is at the top anterior of the forearm
jugular venipuncture the vein is in the neck
lateral saphenous venipuncture the vein is on the outside of the back leg
medial saphenous or femoral venipuncture the vein is on the inside of the leg mainly used in cats. used to collect small amounts of sample
marginal ear venipuncture the edge of the ear in cats. used for small sample testing ie blood smears, glucose testing. the test strip should be designed to measure a capillary and not venous blood sample
arterial blood sample best used to test blood gases the best way to assess pulmonary function
blood gases measure the partial pressure of carbon dioxide (PaCO2-ventilation) and oxygen (PaO2-oxygenation) in the blood
the most common artery used for catheter placement is the dorsal metatarsal artery
advantages for using the dorsal metatarsal artery are 1. catheter can be taped rather than sutured. 2. risk of hematoma is reduced because of the tight SC tissues and the catheter is easier to maintain and kink less
Created by: tnewhouse