Hemocytometrie
- Tellen aantal cellen bloed: microscoop/automatische cellenteller (detector)
- Momentopname
- Enkel circ pool (niet marginale: plakken tegen bv wand) w geteld
- Afh van inflow uit bm, outflow in weefsels
- Geen afwijkende cellen
Flowcytometrie
- Vervolgoz bij afwijkend resultaat hemocytometrie
- Fluorochroom: fluorescerend Ab tegen CD-merkers
- Laserstraal => fluorescent signaal
- X-as: aspecificiteit = 1-specificiteit = False pos rate
- Y-as: sensitiviteit = true pos rate
- Cut-off point : optimale performantie
o Hoog: hoge sens, lage spec
- Non-sense test
o 1e bissectrice => AUC: 0,5-1
3: laboratoriumanalyse
Pre-analytische fase
- Meeste fouten tijdens deze fase
Biologische variabiliteit
- Tijdstip afname
o Bv cortisol: ’s ochtends >>> ’s avonds
- Lichaamshouding
o Liggend (15 min)
o Groot verschil tuss liggen en rechtstaan bij plasma eiw
- Voedselinname
o Maaltijd: TG’s (=> troebel serum), bilirubine, fosfor, glucose, WBC ↗
- Roken
o Leukocytose
o Glycemie, CEA waarde, alfa-1-antitrypsine ↗
- Fysische activiteit
o WBC + spierenzymen (LDH, ALT, CK) ↗
o Oudere mannen: fietsen => PSA ↗
- Zwangerschap
o Hemodilutie: hematocriet + eiwitgehalte + ijzer ↘
o Alkalische fosfatase (placenta) + zs hormonen ↗
Bloedafname
- !te veel stuwing => lactaat + kalium ↗
- Serum
o Plasma - stollingsfactoren
o Geen anticoagulantia
o Stollingsactivatoren: bloed eerst stollen (20-30min) voor centrifugatie
o Separatorgel: tuss serum en cellen
o Routine biochemische bepalingen
- Lithium-heparine
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