Check for other bHCG source - may not be from pregnancy?
Chris
Chris Bromley
POCT Coordinator
UHNS, Central Pathology Laboratory
01782 554670
-----Original Message-----
From: Clinical biochemistry discussion list
[mailto:[log in to unmask]] On Behalf Of Fiona Bethell
Sent: 24 July 2007 13:49
To: [log in to unmask]
Subject: Help - false positive pregnancy tests
48 year old lady is brought to A/E Sunday afternoon after being found
collapsed, pale, nausea, abdo pain.
Assessment shows Hb of 5g/dL and urine preg test positive (Clinitek
Status)
but patient with GCS 14/15 says definitely not pregnant. Not
catheterised
at time of sample collection ( and have my doubts about lidocaine
interference anyway). Urine not kept.
Drug history nil of note but possessions in bag list
co-codamol/paracetamol/zomig/brufen.
Given blood/FFP/plts and whisked off to theatre but not before to serum
bhCGs (Roche E170) are done and give 1 and 6 U/L. ??reliability if v
low
Hb.
Intraoperative notes say no obvious cause for bleed (no AAA/ectopic
rupture)
and given 15 units of blood during op. Another urine arrives and is
positive using Quidel QuikVue one step test so put it through E170 and
get
21.5 U/L.
06:30 bloods this morning - bhCG (E170) =2 but ?reliability after
massive
transfusion.
What's next?
Fiona
Fiona Ivison
Dept Clinical Biochemistry
Royal Liverpool University Hospital
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