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Samenvatting H3 medische biochemie

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Dit is een samenvatting van H3 van medische biochemie. Met deze samenvattingen haalde ik een 18/20.

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HOOFDSTUK 3 : DIAGNOSTIEK BINNEN DE
HEMATOLOGIE
1. Automatische telling RBC, WBC en plaatjes
 CELTELLER voor uitvoeren van ‘complete blood count’ (CBC)
- RBC, WBC, plaatjes, Hb, MCV, MCH, MCHC, reticulocyten
 Impedantiemeting




 Optische meting/ fluorescentie meting




 Automatische differentiatie




2. Microscopisch onderzoek
 Afwijkende stalen : nood microscopisch onderzoek
 Voordeel : snel & goedkoop, digitale microscopie beschikbaar naast de klassieke microscopie
 Nadeel : vraagt expertise, lage gevoeligheid (analyse van slechts 100-500 cellen) , verdere
typering noodzakelijk

, 3. Immuunfenotypering – flowcytometrie




3.1 Hydrodynamische focussing
 Verkrijgen van de juiste oriëntatie van de cel tov het meetapparaat
 Gebruik maken van een sheath flow
 Sheath flow = vloeistofstroom = buffer die de vloeistofstroom met cellen volledig
omringt
 Sheath flow heeft hogere snelheid : vloeistofstroom wordt gefocust
 Cellen gaan individueel in flowkamer (flow cell)

 Flow cell
- Aanstralen van individuele cellen (20.000/seconde) door 1 of meerdere lasers (standaard
in routine 3 lasers 12 fluorochromen)

3.2 Meting van forward scatter (FSC) en side scatter (SSC)
 FSC correleert met grootte en SSC met interne structuur en granulatie
 Differentiatie van celtypes in een heterogene celpopulatie (bloed/beenmerg/suspensie van
biopt) mogelijk = identiek aan werking celteller




3.3 Fluorescentie
 Detectie van fluorescentie na voorafgaandelijke labeling van cellen met antilichamen
gekoppeld aan fluorochromen (anti CD19 antistof met fluorochroom , anti CD3 antistof met
fluorochroom)
 Elk fluorochroom zorgt voor licht emissie bij een welbepaalde golflengte na excitatie door
lasers  gebruik van golflengte specifieke fluorescentie kanalen




 Fluorochromen – excitatie en emissie (Stokes shift)




 Filters en fluorescente detectoren

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