OSCE prep Flashcards
What additive is used in each blood bottle?
Purple - EDTA to bind calcium
Blue - Sodium citrate to bind calcium
Yellow - silica separating gel + red silica
Dark green - heparanised / sodium heparin
What is the order of blood bottles?
Blue - Bring Red - Yellow - Your Green - green Purple - Pens
What does each bottle test?
Blue - D-dimer, INR, APTT
Purple - FBC, reticulocytes, blood film, blood folic acid, monospot, acth, g6dp testing,
Pink - (alternative to purple)group and save, crossmatch, coombs test
Red - alternative to yellow (Arsenal)
Yellow - hormones (cortisol, calcitonin, bhcg, gh, igf), enzymes, tumour markers, toxins, drugs (genta)
Grey - glucose + lactate
Dark green - sodium
What about colours of culture bottles?
Aerobic: blue lid bottle
Anaerobic: purple lid bottle
Mycobacterium: black lid bottle
MRSA swab colour
Black
Groin and nose
Where should limb leads be placed?
Ulnar styloid and malleolus
How long should you wipe a site for?
30 seconds, then 30 seconds to dry
What angle should the cannula be?
10-30
What is the pH of urine?
4.5-8
What are the causes of high urobilogen?
Haemolysis
What are the causes of low urobilogen?
Biliary obstruction
What is the cause of a low pH?
Starvation
Diabetic ketoacidosis
Other causes of metabolic acidosis (e.g. sepsis)
What colour is urine normally?
Straw and clear
What does darker urine suggest?
Dehydration
What are the causes of high pH?
Urinary tract infection
Conditions that cause metabolic alkalosis (e.g. vomiting)
Why should you not do venepuncture where two veins join?
There are often valves present, making venepuncture more difficult
When should you remove the tourniquet?
Before removing the needle
How should you collect blood cultures?
Aerobic before anaerobic
During fundoscopy what might you see in diabetes?
Dot and blot haemmorhages Microaneurysms Neovacularisation Hard exudates Cotton wool spots