All good tips from those responding - I recall the calibration line being a problem on many sites ignoring the cleaning processes we had put in place. It was quite obvious once you took the tray out to look. Just be sure you don't use anything too abrasive to clean it as it could rub off. Probably not the case now. Other problems were excess urine splashing inside the analyser onto the optics, which you cannot clean yourself. Once dry, there would be no way of observing it there.
And lastly, was this the patient's urine? I ask because we had a patient whose friend produced a urine for her (presumably she had taken something illicit) and didn't realise a pregnancy test would be automatically performed on the unit due to her age and what she was being investigated for. Turned out her friend was pregnant and didn't know. It caused us a headache as it took a while to investigate as the patient categorically denied she could be pregnant but didn't own up.
Happy Friday
Tony Cambridge MSc., BSc., Prince2
Lead Biomedical Scientist
Blood Sciences and POCT
Derriford Combined Laboratory
University Hospitals Plymouth NHS Trust
T: 01752 430050
E: [log in to unmask]
Keep Communicating
Put patients first • Take Ownership • Respect Others • Be Positive
-----Original Message-----
From: ACB Point-of-Care Testing [mailto:[log in to unmask]] On Behalf Of Debbie Gooseman
Sent: 27 September 2019 16:35
To: [log in to unmask]
Subject: Re: False positive HCG results.
Thank you Kate,
This is something I hadn’t considered. We do not have a maintenance schedule in place for this machine.
I can’t replicate the error, and don’t have the original sample to try.
Interfering substances are highly unlikely (but never impossible) in this case.
User error has not yet been ruled out, but neither has instrument error - so I have sidelined the device pending outcome of the investigation.
The ward involved followed the correct procedure as it was an unexpected result- a sample was sent to the lab for confirmation and POCT informed.
Thank you everyone for your input.
Debbie Gooseman
Sent from my iPhone
> On 27 Sep 2019, at 16:21, Kate Barber <[log in to unmask]> wrote:
>
> Hi All,
>
> We have Clinitek Status Plus analysers across 60 sites that we look after, used for urinalysis and urine HCG testing.
>
> All of the false positive pregnancy tests that we have encountered have been due to a combination of user error, lack of maintenance on the analyser, pre-analytical errors and clinical reasons that Karen has just mentioned.
>
> The most common reason for false positives on the Clinitek Status Plus is the users not cleaning the white calibration bar at the back of the test tray. The analyser uses optics to look at the calibration bar to determine the line on the HCG cassette. This should be checked regularly and can be washed under the tap and dried properly prior to reinserting the test tray.
>
> Kind Regards,
>
> Kate Barber
> PoCT Trainer
> Level 8 - Point of Care Testing
> The Doctors Laboratory
> The Halo Building, 1 Mabledon Place London WC1H 9AX
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> -----Original Message-----
> From: ACB Point-of-Care Testing [mailto:[log in to unmask]] On Behalf Of KUA, Richard (UNIVERSITY HOSPITALS PLYMOUTH NHS TRUST)
> Sent: 27 September 2019 15:53
> To: [log in to unmask]
> Subject: Re: False positive HCG results.
>
> EXTERNAL SENDER : This email originated from outside of the organisation. Do not click links or open attachments unless you recognise the sender and know the content is safe. If you are unsure please forward to [log in to unmask]<mailto:[log in to unmask]> for analysis.
>
> Hi Debbie your question is both interesting and disturbing.
>
> We are about to implement this across the Plymouth University Hospitals NHS trust and I will watch with interest!
>
> Our problems have all been traced to poor training or human error. If you have genuine machine error I would very much like to know.
>
> Kind Regards
>
> Richard Kua
> POCT Co-Ordinator
> Derriford Hospital Plymouth
> Tel- 01752 433327
>
>
>
>
> -----Original Message-----
> From: ACB Point-of-Care Testing [mailto:[log in to unmask]] On Behalf Of Debbie Gooseman
> Sent: 27 September 2019 15:44
> To: [log in to unmask]
> Subject: False positive HCG results.
>
> Good Friday afternoon mailbase colleagues.
> Has anybody encountered any reported incidents of a false positive HCG result using a urine reader?
> Specifically Clinitek Status?
>
> Thank you in advance,
>
> Debbie Gooseman
> POCT Coordinator
> NL&G NHS Trust
> [log in to unmask]
>
>
> Sent from my iPhone
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