Well…
here’s a weird one. Leaving aside the fact that no one has performed an osmotic
fragility in the last thirty years I’ve never seen a curve showing greater
resistance to lysis. The curve is shifted to the right. Bearing in mind that
HS, HE and AIHA would give lower resistance to lysis (curve shifted to the
left) the correct answer must be sickle cell anaemia. Which thinking about
it would seem to be right (which it was).
But who
on earth would do an osmotic fragility when a simple blood film would point you
in the right direction?
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