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Borderline sweat chloride results.

(20 Posts)
K360 Thu 04-Jan-18 23:03:46

Hi I'm writing as I am really worried. I received a letter today saying my sons sweat test results had come back intermediate (basically borderline) but because he had, had a faecal test done aswell which has come back normal the consultant has wrote that this excludes Cystic Fibrosis, and he will discuss it with me when I see him in May?! Should he not be getting him tested again with the sweat test? I don't understand why it was neccerary to do the sweat test if the faecal test ruled it out. My son is 5 nearly 6 has failure to thrive. I just feel like I'm being fobbed off! Has anyone had an experiance like this don't know how I'm expected to wait till May tbh.

helensburgh Fri 05-Jan-18 01:58:38

Hi.
My daughter has had similar issues.
First tested positive amd had the genetic test which was negative ( although doesn't exclude all mutations)
So repeated sweat test... positive.
Elastase in poo was normal so forgotten about.
At a different hospital. 3 more sweat tests .2 positive one negative.
Turns out she has a probable problem.with glucose storage..still waiting on results but this can cause a false positive
Hope you get some more answers

Bubble2bubble Fri 05-Jan-18 10:29:37

A normal faecal elastase wouldn't rule out Cystic Fibrosis, though does indicate his pancreas is functioning normally. Pancreatic function can vary in people with CF.
I would certainly push for a repeat sweat test. Does he have any other symptoms?

NK346f2849X127d8bca260 Sat 06-Jan-18 23:55:28

They should do two sweat tests, what was the result? also some mutations do not cause pancreatic insufficiency so the elastase test will be normal.
Have they done any blood tests?

JustVent Wed 07-Feb-18 10:48:40

I know this is a month old but what happened in the end @K360 ?

My son had a result of 45 on his sweat test a couple of weeks back. On Monday they repeated it and I’m just waiting for them to call me about the results. They also took a stool sample.
He is symptomatic, constant chest infections and needs prophylactic antibiotics and has done for a few years.

NK346f2849X127d8bca260 Wed 07-Feb-18 18:25:50

just has he ever had a blood test to look for CF mutations?

NK346f2849X127d8bca260 Wed 07-Feb-18 18:28:22

My son had intermediate sweat test results and one mutation was found, he is symptomatic and has been since a toddler.

JustVent Wed 07-Feb-18 21:18:16

NK he had a blood test to see if he was a carrier of the CF gene which was negative.
Now his dna is being tested in a different country for rarer mutations, but it’s going to take a few months.

NK346f2849X127d8bca260 Thu 08-Feb-18 00:10:00

Are you not UK then?
My son had extended genotyping to look for rare mutations, it took about 3 months to come back.

JustVent Thu 08-Feb-18 00:43:03

We are in the UK, yes.
Apparently the extensive DNA testing has to happen in a different country, hence the delay in results.

NK346f2849X127d8bca260 Thu 08-Feb-18 10:14:40

My son had the the most extensive genotyping, his bloods were sent to Manchester.

NK346f2849X127d8bca260 Thu 08-Feb-18 10:32:38

Brompton have said the test is 98% sensitive but still cannot rule out CF, so with one known mutation, borderline sweat tests, poor weight gain, ABPA, sinus and chest symptoms we are in a grey area.

Bubble2bubble Thu 08-Feb-18 12:08:14

That's incredibly tough. NK346 sad but the Brompton is the absolute gold standard in CF care so you will get good treatment.
Dd had a second rare mutation and had bloods sent to Manchester but it was 5 years before they found it. ( she did have a positive sweat test though, so was treated as having CF from six weeks)

JustVent Thu 08-Feb-18 21:19:05

I wonder if ours has been sent to Manchester.

Our consultant warned us that it would be a few months he also said “I even think it has to go to a different country.”

Then another consultant working for him called me about something else, she had an accent and spoke softly. When she told me the place his DNA was being tested, I couldn’t make out what she said.

In a nutshell, I’ve made an assumption from little information that it’s been sent to another country. Now I wonder if she said Manchester.

I still haven’t had Monday’s sweat test result.
Last time he had the test (Monday as well) they called me on the Friday. So
I’m hoping they call me tomorrow.

JustVent Fri 09-Feb-18 11:36:04

Argh I missed the call from the hospital. I’ve asked them to call me again, I hate waiting for results.

NK346f2849X127d8bca260 Fri 09-Feb-18 16:54:43

bubble they have discharged him back to our local hospital for them to decide how to treat/following him.
Brompton hospital appointment was a bit upsetting as consultant said because of his carrier mutation he has a high chance of being infertile because of CBAVD, I knew men with CF were but didn't realise it could affect carriers too.
How did they find your daughter's second mutation five years later?

NK346f2849X127d8bca260 Fri 09-Feb-18 16:55:23

just any news?

JustVent Fri 09-Feb-18 16:58:34

Yes I just got the call, this time the results were 27 and 28 which is fantastic.

I know it’s not a definitive answer but it’s better at least

Bubble2bubble Fri 09-Feb-18 20:10:58

NK as I understand they test for the most common mutations first. CF is very predictable geographically and around 80% of people in the UK have one mutation ( my DH carries this). After this they move on to look for the less common mutations but there are so many (around 1800?) of these it can take years sad
As it turns out the mutation I carry is fairly common in certain parts of Europe but virtually unknown here.

Bubble2bubble Fri 09-Feb-18 20:11:36

justvent that is good news smile

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