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Will an LFT at 10 days be negative?

30 replies

coviduality · 28/11/2021 20:17

My whole family tested positive for covid last Tuesday, symptoms started Monday.
We are at home isolating, we are allowed out on Thursday 2nd Dec.
On Friday 3rd, we have plans to go for the weekend to my sister's, along with my parents etc, 14 of us in total.
Parents and sister are quite concerned that we will only just have come out of isolation, and may still be infectious.
They would like us to take LFTs, and only come if they are negative.
I am worried that they could be positive even if we're no longer infectious, and am feeling that this extra measure is unnecessary. Obviously though, I don't want to risk infecting my parents!
Has anyone done this? Anyone still positive on lft after 10/11 days?
I know we're not meant to take a pcr for 90 days, but LFTs work differently?

OP posts:
dementedpixie · 28/11/2021 20:18

Aren't supposed to take LFTs either

BunsyGirl · 28/11/2021 20:19

My DC’s lateral flow was negative by day 10.

jenkel · 28/11/2021 20:26

I know you aren’t supposed to but I tested on myself out of curiosity and mine was clear by day 12, dh was clear by day 8. Not sure if it means anything but he had it really mild whereas I had it a lot worse.

honeylemonteaforme · 28/11/2021 20:31

I would cancel if it were me, even if it is allowed is it really worth the risk?

coviduality · 28/11/2021 20:31

And does positive on an lft definitely mean 'still infectious'?

OP posts:
coviduality · 28/11/2021 20:32

@dementedpixie

Aren't supposed to take LFTs either
I can't find that info anywhere, it's so hard to find accurate advice online!
OP posts:
dementedpixie · 28/11/2021 20:33

@coviduality

And does positive on an lft definitely mean 'still infectious'?
No not necessarily
coviduality · 28/11/2021 20:33

@honeylemonteaforme

I would cancel if it were me, even if it is allowed is it really worth the risk?
Well, they live on the other side of the country, we almost never see them, it would be a substitute Christmas, everyone would be devastated, especially the kids! But... yeah... it's not worth accidentally killing grandma for!!
OP posts:
TripleSeptic · 28/11/2021 20:37

3 lateral flow for me, all negative, positive PCR and I felt really ill.

Family member had 2 positive lateral flow and 2 negative PCR at the same time as I was ill.

3 people in my house, 2 ill, 2 positive pcrs, lateral flow negative for all 3.

Track and trace said I was most infectious 2 days before 1st symptom then infectiousness decreases as time goes on.

Waxonwaxoff0 · 28/11/2021 20:37

They can still test positive the same as PCRs, but most people I've spoken to said theirs were negative after 10 days. If they are positive it does not mean you're still infectious, that's not how it works.

NovemberNovemberDarkNights · 28/11/2021 20:38

My friends (& their kids) tested positive (LFT then PCR) , they all got negative LFT's towards the end of their isolation period.

I'm not convinced even if it's positive that you'd still be able to pass it on, but hopefully a negative LFT will stop them being so stressed.

However, you're supposed to isolate for the next 10 FULL DAYS after your positive test, so you're not out of isolation until Saturday the 4th and given they reduced it from
14 days because (economically that's advantageous) 'most' people are no longer transmitting it after 10 days, I personally wouldn't want to meet up with my parents so soon.

ANameChangeAgain · 28/11/2021 20:39

My dh tested positive 12 days later, but he still had symptoms.

BobbinTheRobin · 28/11/2021 20:39

You are less likely to infect them than other people coming who may be incubating covid but not yet tested positive. The only exception to this being if you still have certain symptoms like diarrhoea. That said I was negative on a lft by day 6. In your situation I would agree to do the LFTs, they will probably all be negative but if not you can decide what you tell them.

dementedpixie · 28/11/2021 20:41

I thought it was always 10 days for those with covid and 14 days for contacts. It was the 14 days for contacts that got reduced to 10 days

dementedpixie · 28/11/2021 20:44

@NovemberNovemberDarkNights

My friends (& their kids) tested positive (LFT then PCR) , they all got negative LFT's towards the end of their isolation period.

I'm not convinced even if it's positive that you'd still be able to pass it on, but hopefully a negative LFT will stop them being so stressed.

However, you're supposed to isolate for the next 10 FULL DAYS after your positive test, so you're not out of isolation until Saturday the 4th and given they reduced it from
14 days because (economically that's advantageous) 'most' people are no longer transmitting it after 10 days, I personally wouldn't want to meet up with my parents so soon.

It's 10 days from start of symptoms which was the Monday. Isolation ends midnight on 2nd December
ParkheadParadise · 28/11/2021 20:45

I took a LFT on day 7. Just to see if it was negative. It was although I did stay in until day 10.

milkysmum · 28/11/2021 20:46

You are highly unlikely to be infectious at day 10, generally people are most infectious at about day 5 and most people have the virus days before realising.
You can continue to get false positives on both PCRs and LFTs for up to 90 days due to viral shedding which is why the advise is not to test within this period unless you have new symptoms.

Waxonwaxoff0 · 28/11/2021 20:46

@NovemberNovemberDarkNights

My friends (& their kids) tested positive (LFT then PCR) , they all got negative LFT's towards the end of their isolation period.

I'm not convinced even if it's positive that you'd still be able to pass it on, but hopefully a negative LFT will stop them being so stressed.

However, you're supposed to isolate for the next 10 FULL DAYS after your positive test, so you're not out of isolation until Saturday the 4th and given they reduced it from
14 days because (economically that's advantageous) 'most' people are no longer transmitting it after 10 days, I personally wouldn't want to meet up with my parents so soon.

It's 10 days from start of symptoms, it's only 10 days from positive test if you have no symptoms.
BobbinTheRobin · 28/11/2021 20:51

It is 11 days including the day you first have symptoms though so if Monday 25th was first symptoms then you are not out of isolation until Friday 3rd.

coviduality · 28/11/2021 20:54

@BobbinTheRobin

It is 11 days including the day you first have symptoms though so if Monday 25th was first symptoms then you are not out of isolation until Friday 3rd.
Yes you're absolutely right, isolation ends Thurs 2nd, freedom day is Friday 3rd! Bad wording from me before.
OP posts:
coviduality · 28/11/2021 21:23

@Waxonwaxoff0

They can still test positive the same as PCRs, but most people I've spoken to said theirs were negative after 10 days. If they are positive it does not mean you're still infectious, that's not how it works.
Can you show me anything that says that that's not how it works? I've had no luck AT ALL finding anything online that I can share with my family. I didn't think it was, but a hunch just ain't gonna cut it!
OP posts:
Tigerwhocameforsupper · 28/11/2021 21:28

My LFT was negative by day 5

coviduality · 28/11/2021 21:37

@milkysmum

You are highly unlikely to be infectious at day 10, generally people are most infectious at about day 5 and most people have the virus days before realising. You can continue to get false positives on both PCRs and LFTs for up to 90 days due to viral shedding which is why the advise is not to test within this period unless you have new symptoms.
Is that definitely true of lfts, not just pcrs? No one seems to be sure.

Maybe I should just stop clutching at straws and start reconciling myself to the fact that this isn't going to work Sad

OP posts:
Meredusoleil · 28/11/2021 21:42

My dd2 has tested negative on an LFT on day 8 of her isolation period.

dementedpixie · 28/11/2021 21:43

I'm in Scotland and our government site says:

LFD tests should only be used if you don’t have symptoms.

You must not use a LFD test if you:

  • have symptoms - you must self-isolate immediately andbook a PCR test
  • have been askedto self-isolate because you are a close contact of a positive case. You must self-isolate andbook a PCR test
  • have tested positive for coronavirus in the last 90 days